Forest Renewal Research Articles

Impacts of Downed Dead Wood Poplar Trees on Forest Regeneration in the Semi-Arid Region of Northern China

In the past few decades, due to rising temperatures and changes in precipitation, the degree of drought in semi-arid areas has increased, leading to a large number of tree deaths and threatening the natural forests distributed in the semi-arid areas of North China. This article takes the forest ecosystem of Saihanwula Nature Reserve in the southern section of Greater Khingan Mountains in China’s semi-arid region as a research area and studies the distribution of downed dead wood and its impact on forest renewal in the area. We used the sample plot survey method, investigated the number of downed dead wood, decay class, dumping direction, existence form, and the number of regenerated seedlings in the sample plot, and calculated the density of regenerated seedlings in different plots. The renewal density is 4050 ± 824, 2950 ± 265, plants/ha, and 2625 ± 237 plants/ha, respectively, in the sample plots for Later-death plot, Mid-death plot, and Early-death plot. The average storage of downed dead wood in Saihanwula Nature Reserve is 58.51 ± 16.56 m3/ha. The distribution densities of downed dead wood are 50 ± 21, 806 ± 198, 189 ± 76, and 22 ± 5 plants/ha for decay classes II, III, IV, and V respectively. The main form of downed dead wood in the research area is “trunk base fracture”, accounting for 68.78% of the total number of downed dead wood. A large number of downed dead wood had serious negative effects, such as crushing and injuring the regeneration seedlings and other plants under the forest at the moment of dumping and for a long time after dumping. The crushed and injured rate is 5.3~7.8%, with downed dead wood accumulated in the forest from the early stage of downed dead wood. It had negative effects on the regeneration of seeds, seedlings, and young trees, such as obstructing and hiding the light from the soil surface and inhibiting the regeneration and growth of seedlings. However, after the trees were dumped, large gaps appeared in the forest, increasing the sunlight area on the soil surface. In the later stage of tree death, moderately high decayed downed dead wood changed the soil structure in terms of soil softness, water holding capacity, and nutrient content, thus promoting the growth of seedlings and young trees. Reasonably utilizing the relationship between downed dead wood and forest renewal can effectively promote the healthy development of forests.

Responses of Soil Organic Carbon Fractions and Stability to Forest Conversion in the Nanling Nature Reserve, China

Studying the impact of typical vegetation types in forest conversion zones on soil organic carbon (SOC) structure and stability is crucial for developing terrestrial ecosystem carbon sequestration strategies. In this study, we selected three typical forest stands in the Nanling National Nature Reserve: a primary evergreen broad-leaved forest (BL), a secondary mixed coniferous and broad-leaved forest (ML), and a Chinese fir plantation (CL). Soil samples were collected to examine the SOC fractions and carbon pool management index (CPMI) in three forest stands. The influence of soil property factors on SOC fractions was also analyzed. The results showed that the transformation process from a BL to an ML or a CL changed the structure and stability of organic carbon by reducing the labile SOC fractions and increasing the recalcitrant carbon fraction in the soil. The higher lability index (LI) and CPMI of soils in the BL indicated better carbon accumulation and activity, making this treatment more advantageous for management strategies aimed at promoting natural forest renewal and ecological restoration. Correlation and RDA analysis revealed that the availability of soil P was a key factor limiting the variation in organic C fractions in the acidic soils of tropical forests in South China.

Нейросетевой кластерный анализ устойчивого развития экономики регионов Российской Федерации в аспекте принципов ESG

The sustainable development of the innovative economy in the regions of the Russian Federation is researched. From this position, the changes in the commissioning of capacities for the protection of water resources and atmospheric air from pollution, as well as the renewal of forests in Russia for the period 2017–2022 are presented. Taking into account the importance of responsible investment, investments in fixed assets aimed at environmental protection and rational use of natural resources of the Russian Federation in 2022 are given. The relevance of the research is due to the progress in the achievements of science and technology, as well as the existing strong competition. This requires the promotion of creative concepts in the management of sustainable socio-economic development of Russia. Such concepts may be based on consideration of ESG criteria: Environment — environment, Social — social development, Governance — corporate governance. In order to reduce the heterogeneity of the socio-ecological development of Russia, the multifactorial task of strategic management on the formation of a methodology based on ESG principles is analyzed. The authors propose a promising and productive method for solving multifactorial problems — neural network cluster analysis using information technology. It allowed us to distribute the regions of the Russian Federation into six cluster formations characterized by different levels of development in the perspective of ESG features according to a set of 11 indicators. The structure of clusters detailing the entry of Russian regions into them is given. The average values of the studied indicators of sustainable innovative development of the regional economy in each of the clusters and in the whole country are shown. It follows from the results of the work that the management’s focus on the synthesis of ESG principles and the productivity of responsible investment will become important components in the formation of strategies for the innovative development of the Russian economy. This will be one of the key factors in strengthening the economic security of the Russian Federation.

Природне лісовідновлення сосни на зрубах без застосування заходів сприяння

Mass drying of pine forests in Polissya ambiguously demonstrated that the dominant monocultures of single-tiered, same-age forestry origin have low biological stability. This necessitates the transformation of the forest fund of artificial origin into natural forests. The article evaluates the prospects of «passive» natural renewal of pine – without use of activities to facilitate natural renewal of forest and without the creation of even partial forest cultures, but with activities to care for natural renewal. The study of the natural renewal of pine was carried out on the Troyaniv Forestry of the branch «Horodotske lisove hospodarstvo» (Horodotsk Forestry). Information is given on the dynamics of the number of natural renewal of pine during 2020-2023. It was established that self-sowing generations of pine can initially reach a significant density (30-43 thousand of plants per 1 ha), however, the decisive condition for the formation of stable natural young forest is the action of pathological factors. The greatest losses of self-sowing (90-95% of the total number of dead shoots) were caused by damage to the roots by the larvae of the common cockchafer. However, due to the high initial density, the forest's potential for self-regeneration is still maintained.

Geospatial Inventory of the Galakand Forestry Area Utilizing GIS Database and Remote Sensing Techniques

This study investigated the dramatic reduction of forested areas in Azerbaijan, exceeding 50% over the past two centuries, largely due to increased wood production. Focusing on the period between 1880 and 1990, it analyzed the impact of timber harvesting on the composition of dominant tree species, with a special focus on beech trees, in the Galakand forestry area. Utilizing GIS databases and remote sensing techniques, the research assessed the changes in forest cover and species distribution, highlighting the critical transition from lush beech and oak forests to areas dominated by hornbeam, east hornbeam, oak-hornbeam, and juniperus-bush light forests. The study demonstrated the negative consequences of historical overexploitation, advocating for forest farming practices that promote the recovery and preservation of native forest ecosystems. Key findings revealed a marked decline in valuable wood species due to intensive logging activities, particularly between 1880 and 1914, and the detrimental effects of forest renewal cabins established from 1930 to 1970. The outlined measures in the study highlighted that the forest primarily comprises wooded areas (reserves with a completeness of 0.1-0.2, clearings, and clearings), non-forest lands repurposed as pastures and forested pastures with a density ranging from 0.3 to 0.4. Overall, the findings underscore the importance of sustainable forest management practices to reverse the adverse effects of historical overexploitation and preserve the biodiversity of Azerbaijan's ecosystems. The paper emphasized the necessity of sustainable forest management to reverse the damage and protect Azerbaijan's biodiversity to enhance measures for sustainable forestry, along with the critical role of advanced GIS and remote sensing in monitoring and conserving forest resources.

Energy Efficiency of Conifer Cones and Seed Extraction Residue Biomass

Sustainable forest management, which accounts for the multiple roles played by forests, includes seed collection from selected areas for forest renewal and regeneration. The process of harvesting conifer seeds generates considerable amounts of waste biomass that can be used as a source of energy to supplement the local solid fuel market. Therefore, their quality is an important consideration. The mass fraction of Scots pine seed extraction residues was determined in this study. The thermophysical properties and elemental composition of the residues and spent Norway spruce and European larch cones (after seed extraction) were evaluated. An analysis of Scots pine seed extraction residues revealed that only cones had practical application. They accounted for more than 99% of total residue biomass and were characterized by the lowest content of ash, sulfur, and chlorine. The calorific value of cones of the analyzed tree species ranged from 17.08 to 18.29 MJ kg−1, the chlorine content was 0.010–0.041% DM, and the sulfur content was 0.019–0.043% DM. Due to the specificity of the extraction process, the generated waste, including cones, had a very low moisture content of 6.86–10.02%, which significantly increased their value as solid fuel.

POST-FIRE CONDITION AND RESTORATION OF FORESTS ON THE TERRITORY OF KOSTANAY REGION

The results of field studies of post-fire condition and reforestation of Kostanay region are presented. The purpose of the research is to study and analyze the post-fire condition and forest regeneration in the territory of Kostanay region. It was established that the magnitude of post-fire tree declines and their radial growth in stands of the main forest-forming species are determined by the type and intensity of fire. Taking into account the types of forest landscapes using space images, we have identified 7 key and control (background) sites that characterize the disturbed and background undisturbed forest cover. Among them, the most affected by the forest fire are key areas No5 and No7, where a top fire of medium intensity occurred. The forest litter of these key areas was completely burned in a severe fire, the soil seed stock was destroyed, and low intensity of natural regeneration is expected. The average grade of all studied key sites is estimated by us as III and it is connected with untimely harvesting, which resulted in the reduction of annual growth of the plantation. Sanitary condition of plantations in key sites No1, No5, No7 is unsatisfactory in comparison with other sites. Soils of the investigated key sites are not compacted and favorable for growth. In key plot No.1 there was a compacted crust in the surface soil layer. Uneven natural regeneration of common pine after the fire is observed. Predominantly friendly seed sprouting is associated with more moistened lowlands and loosened soil areas. Factors impeding the natural renewal of pine forests include deep burning of the forest floor and soil cover, mechanical effects on the soil and seedlings of the equipment used to develop harems, the mushroom wavy rhizina (Rhizina undulata) which affects the roots of coniferous trees.

SEED GERMINATION AND GROWTH DYNAMICS OF SEEDLINGS OF SCOTS PINE (PINUS SYLVESTRIS L.) WITH A CLOSED ROOT SYSTEM ON DIFFERENT SUBSTRATES

The relevance of the study is due to the great needs of growing high-quality planting material in a short time for forestry reclamation on disturbed lands both during oil and gas exploration and during oil and gas production. The paper presents the results of studies of germination energy, germination and growth dynamics of Pinus sylvestris L. seedlings grown in RKL-81 cassettes in a greenhouse in 2022 and 2023. At the same time, the renewal of forests is possible after the technical and biological stages of recultivation when creating forest crops from indigenous forestforming species. In 2022 and 2023, experiments were conducted on different types of peat-based substrate, differing in density, nutrient content and additional components from a complex of humic acids and salts, mineral fertilizers, trace elements, strains of friendly soil microflora and mycorrhiza. Pre-sowing seed treatment and agrophysical properties of substrates affected the energy of seed germination and germination, as well as an increase in the total number of germinated seeds during the first month. Good germination results were obtained in 2022 with pre-sowing seed treatment with Borogum-M, Rich-Micro, Bionex-Kemi preparations in low-density peat, filled with the starting composition of fertilizers. However, the biometric indicators of seedlings were slightly higher on the substrate with the addition of humic acids and salts, mineral fertilizers, trace elements, strains of soil microflora and mycorrhiza. In 2023, agroperlite was added to one of the peat substrates to reduce density and increase porosity. The germination energy, germination rate and dynamics of the emergence of seedlings on this substrate turned out to be the highest (from 93 to 100%). It is proposed to grow pine seedlings during one growing season on low-density peat with the addition of agroperlite and a complex of mineral and organic components, including soil microflora and mycorrhiza. This will speed up the process of obtaining the planting material of scots pine for forestry reclamation on disturbed lands both during oil and gas exploration and during oil and gas production.

Multi-Indices Diagnosis of the Conditions That Led to the Two 2017 Major Wildfires in Portugal

Forest fires, though part of a natural forest renewal process, when frequent and on a large -scale, have detrimental impacts on biodiversity, agroforestry systems, soil erosion, air, and water quality, infrastructures, and the economy. Portugal endures extreme forest fires, with a record extent of burned areas in 2017. These complexes of extreme wildfire events (CEWEs) concentrated in a few days but with highly burned areas are, among other factors, linked to severe fire weather conditions. In this study, a comparison between several fire danger indices (named ‘multi-indices diagnosis’) is performed for the control period 2001–2021, 2007 and 2017 (May–October) for the Fire Weather Index (FWI), Burning Index (BI), Forest Fire Danger Index (FFDI), Continuous Haines Index (CHI), and the Keetch–Byram Drought Index (KBDI). Daily analysis for the so-called Pedrógão Grande wildfire (17 June) and the October major fires (15 October) included the Spread Component (SC), Ignition Component (IC), Initial Spread Index (ISI), Buildup Index (BUI), and the Energy Release Component (ERC). Results revealed statistically significant high above-average values for most of the indices for 2017 in comparison with 2001–2021, particularly for October. The spatial distribution of BI, IC, ERC, and SC had the best performance in capturing the locations of the two CEWEs that were driven by atmospheric instability along with a dry environment aloft. These results were confirmed by the hotspot analysis that showed statistically significant intense spatial clustering between these indices and the burned areas. The spatial patterns for SC and ISI showed high values associated with high velocities in the spread of these fires. The outcomes allowed us to conclude that since fire danger depends on several factors, a multi-indices diagnosis can be highly relevant. The implementation of a Multi-index Prediction Methodology should be able to further enhance the ability to track and forecast unique CEWEs since the shortcomings of some indices are compensated by the information retrieved by others, as shown in this study. Overall, a new forecast method can help ensure the development of appropriate spatial preparedness plans, proactive responses by civil protection regarding firefighter management, and suppression efforts to minimize the detrimental impacts of wildfires in Portugal.

Structural and functional features of the natural renewal of pine forests on lands removed from agricultural use of the southern slope of the Russian Plain

Structural and functional features of the natural renewal of pine forests on lands removed from agricultural use of the southern slope of the Russian Plain

Identification and spatial extent of understory plant species requiring vegetation control to ensure tree regeneration in French forests

Key messageFifteen species are most susceptible to require vegetation control during tree regeneration in the range of our study. Among these 15 species, Rubus fruticosus, Pteridium aquilinum, and Molinia caerulea cover each more than 300,000 ha of open-canopy forests.ContextVegetation control, i.e., the reduction of competitive species cover, is often required to promote tree seedling establishment during the forest regeneration stage. The necessity to control understory vegetation largely depends on the species to be controlled. In order to plan forest renewal operations, it is critical to identify which species require vegetation control during the regeneration stage and to quantify the forest area affected by these species.AimsWe aimed at identifying the main species requiring vegetation control and at estimating the forest area they cover at the national level.MethodsUsing National Forest Inventory data, we created four indicators based on two levels of plant cover, cross-referenced with two levels of canopy opening, and compared them to the outcome of a survey of forest manager practices.ResultsThe best indicator was the one that represented the proportion of forests with open canopy where the species was present with a large cover in the understory. In non-Mediterranean France, according to the indicator, a total of 15 species were found to frequently require vegetation control during the tree regeneration stage. Pteridium aquilinum, Molinia caerulea, and Rubus fruticosus were the main species, and each covered more than 300,000 ha of forest with open canopies, representing about 13% of the total forest area with open canopies outside of the Mediterranean area.ConclusionsForests covered by species requiring vegetation control according to forest managers represent a large share of the forest area undergoing regeneration. This study provides the first list of species that require vegetation control based on a methodological protocol that makes it possible to calculate the area associated with each species.

Trembling Aspen Stand Response 15 Years after Windthrow, Salvage Harvesting, and Forest Renewal

Windthrow is a common occurrence in boreal forests, affecting wood supply and presenting regeneration challenges for forest managers. Salvage harvesting is often conducted afterwards to extract valuable wood and improve access for forest renewal activities. Research efforts, however, are generally limited to the effects of windthrow and salvage harvesting in the first few years following disturbance. In 2006, a catastrophic wind event occurred in a trembling aspen (Populus tremuloides Michx.) forest in northeastern Ontario. A field study was established with a range of silvicultural treatments from leaving after windthrow (W) to forest renewal treatments including windrow site preparation, planting, and herbicide release (WSPR). While the results of first 5-year assessment have been reported, the objective of the current study was to reassess treatment effects at 15 years post-disturbance, a stage of stand development that is more indicative of future forest conditions. Compared to the results of the earlier assessment, the 15-year assessment indicated that standing dead wood (snags) declined, whereas coarse downed wood did not change substantially over time. Post-disturbance salvage harvesting improved aspen regeneration in terms of density, stocking, and growth, but substantially reduced the proportion of conifers relative to windthrow only. Thus, salvage harvesting helped to sustain aspen composition, compared to other treatment options that increased proportions of pine and spruce trees from W to windthrow and salvage harvesting combined with windrow site preparation and planting (WSP), and from WSP to WSPR.

Use of the Earth Remote Sensing Data to assess the state of recreational forests in the Kokshetau National Park

Currently, modern satellite systems are increasingly used in various areas of studying natural resources and the dynamics of natural phenomena, and in carrying out an ecological assessment of the state of the environment. At the same time, remote sensing data provide greater visibility, data acquisition in dynamics, high speed of image acquisition, and transmission. The article presents the results of spatio-temporal changes in the vegetation biomass of the Kokshetau National Park based on the calculation and analysis of the vegetation index. Based on the analysis of the NDVI values, the tendencies of changes in phytomass were estimated and correlations with the main climatic characteristics of the territory for the studied period were revealed. For the research, we used Landsat satellite images and geoinformation mapping in the ArcGIS software package. In general, there is a negative trend in the values of the indices for the forests of all functional zones over a 10-year period. For the preservation and further renewal of forests, the National Park of Kokshetau needs to carry out a number of regulatory measures.

Climate and ungulate browsing impair regeneration dynamics in spruce-fir-beech forests in the French Alps

Key messageDifferent components of water balance and temperature reduce density and height growth of saplings of Picea abies (L.) H. Karst (Norway spruce), Abies alba Mill. (silver fir) and Fagus sylvatica L. (European beech) in mixed uneven-aged forests in the French Alps and Jura mountains. Ungulate browsing is an additional pressure on fir and beech that could jeopardise the renewal of these species in the future.ContextThe uncertainty in tree recruitment rates raises questions about the factors affecting regeneration processes in forests. Factors such as climate, light, competition and ungulate browsing pressure may play an important role in determining regeneration, forest structures and thus future forest composition.AimsThe objective of this study was to quantify sapling densities and height increments of spruce, fir and beech and to identify dominant environmental variables influencing them in mixed uneven-aged forests in the French Alps and Jura mountains.MethodsSapling height increment and density were recorded in 152 plots, and non-linear mixed models were obtained to establish relations between them and environmental factors known to affect regeneration, namely altitude, slope, aspect, canopy openness, soil characteristics, temperature, precipitation and ungulate browsing.ResultsRegeneration density, varying from 0 to 7 saplings per m 2, decreased with sapling height and was also negatively affected for spruce by PET, but positively for fir by precipitation and for beech by mean annual soil water content. Height increment reached up to 50 cm annually, increasing with sapling height and canopy openness and decreasing under high maximum summer temperatures for spruce and beech. The statistical effect of different environmental variables varied slightly among species but trends were quite similar. Additionally, ungulate browsing was high, with fir being the most intensely browsed, followed closely by beech, while spruce was rarely browsed.ConclusionsAll these results suggest that more temperature warming and a decrease in water availability could negatively impact sapling growth and density in the three species, with possible reduction of forest renewal fluxes. The observed increase of ungulate populations leading to increased browsing could be particularly detrimental to fir saplings.

The probability of occurrence of disperser and pollinator birds in urban riparian forests

Riparian forests are important for their ecological function and provision of services regarding the maintenance of water resources and wild fauna. Paradoxically, it is one of the ecosystems that suffer most from anthropization, especially urbanization. Thus, our objective was to compare the probability of occurrence of pollinating and dispersing species in two areas of riparian forest, where the periurban fragment is inserted in an area with patches of forest remnants and the urban fragment, an area of forest remnant located in a heavily constructed region. From the results obtained, we note that the riparian forest area considered preserved had the highest occurrence of dispersers, while the area inserted in the urban matrix had the highest occurrence of pollinators. In this way, it was possible to observe that the most preserved area showed greater equality between the groups, with a greater number of dispersers. Still, riparian forest isolated by strong urbanization showed that dispersers had a low frequency of occurrence, an essential function in the renewal and continuity of riparian forest in the future.

Влияние изменения физико-химических свойств почв на флористический состав пирогенных территорий лесостепи Среднерусской равнины

For a ten-year period after the fire of 2010, three succession phases were established in the development of the pyrogenic formation of Betula pendula in the conditions of the forest-steppe zone in the Voronezh and Lipetsk regions. The first phase from 2011 to 2014 is a pioneer grouping, with a random set of plants and their disunity. The soils in this phase differed in fluctuations in acidity with its general decrease. In the 2nd phase of succession from 2015 to 2018, the complication of the structure of the phytocenosis was established with the approval of the forest phytocoenotype as an indicator of the beginning of the formation of the forest flora. Some acidification was observed in soddy-forest soils and leached chernozems during this period. In the third phase of succession, starting in 2019, further formation of the community continues. Comparing the flora and soil cover over a 10-year period, we note that a forest fire is not only a catastrophic natural or anthropogenic phenomenon, but also the creator of a new floristic diversity (2015-2018), forest renewal with physical and soil chemistry. In the studied soils in 2019, stabilization of pHwater values was recorded. almost at the level of background indicators. There is a connection between the dynamics of forest phytodiversity and the physical and chemical properties of the soil. Keywords: BETULA PENDULA FORMATION, FLORA, SODDY FOREST GLEY-ELUVIAL SANDY SOILS, LEACHED CHERNOZEM, BACKGROUND AND PYROGENIC FORMATIONS, PHYSICO-CHEMICAL PROPERTIES OF SOILS

울진 소광리 금강소나무림 식생구조 특성에 따른 관리방안†

The Geumgang Pine (<italic>Pinus densiflora</italic>) Forest in Sogwang-ri, Uljin has traditionally been a pine tree protection area (prohibited forest) for timber production purposes, and is now designated and managed as a protected area for forest genetic resource conservation by the Korea Forest Service. This study, we analyzed topographical characteristics, existing vegetation, tree age, and plant community structure, and proposed a sustainable management method for the Geumgang Pine (<italic>Pinus densiflora</italic>) Forest in Sogwang-ri, Uljin for timber havesting purposes. The topographical characteristics of the target area were 36.7% ridges and 38.7% valleys; the ratio of ridges to valleys was similar, and the slopes formed 24.7% of the total area. The types of pine forest communities are divided into six types based on the progress of pine forest renewal, the competition with other species such as deciduous broadleaf trees, and the formation of layered structures. It has been confirmed that the age of the large-diameter pine trees (40～60cm in diameter) is approximately 60～70 years, which is relatively low. As a result of the analysis of the relative importance percentage and layered structure, differences depended on the progress of the pine forest renewal project, and not only the maintenance of the pine forest, but also the creation of a secondary growth forest, the density adjustment of pine trees, and the active management of competitive trees. The average basal area by the community was 12,642.1～25,424.4cm² for the tree layer and 1.8～1,956.5cm² for the low tree layer based on a quadrat of 400m². The difference in the basal area appeared to depend on the size and number of trees forming the tree layer and the degree of pine forest renewal (the degree of time elapsed after thinning pine trees). The average number of species that appeared in each community was 8.7–20.3; there were many species located in valleys, and the type competes with deciduous broadleaf trees due to the lack of management. The diversity of species ranged from 0.6915-1.0942, and was evaluated as low compared to pine communities in central temperate zones. In this paper, we determined the management goals of Geumgang Pine (<italic>Pinus densiflora</italic>) Forest in Sogwang-ri, Uljin to produce timber with high economic value, and suggested efficient vegetation management for continuous afforestation, the establishment of a timber production system, and improvement of wood production as a management direction.

Systemic integrity and similarity of the spatial and age structure of the undergrowth of Scots pine and Crimean pine

Studies of the natural reafforestation of pine forests (Pinus silvestris. L.) on the territory of the southern brae of the Russian Plain, as well as the foothill and mountain-forest Crimea (Pinus pallasiana D. Don), carried out by us during 2003 - 2021, allowed us to put forward an assumption about the general features of the spatial structure of the undergrowth of species of the genus Pinus. The uniformity of the structure of coenopopulation fragments and coenopopulation of undergrowth can be equally observed in different ecological conditions, for example, under the forest canopy, as well as within the boundaries of existing breaks in the canopy of forestry shelterwood, on burnt forests along the linear contours of forest tracts, on lands taken out from under agricultural use, etc. In each specific case, the invariance and, at the same time, the different scale of the structure of coenopopulations of undergrowth is explained by the complementarity of bioecological properties of seedling growth and undergrowth capacity of existing ecological niches, autoregulation of the cenopopulation structure in accordance with the dynamics of changes in ecological factors limiting the process of natural renewal of pine forests. Similarity of the spatial structure of coenopopulations of P. silvestris undergrowth. and P. pallasiana and its constituent elements is an argument in favour of the assumption of the fractal nature of the process, which makes it possible to explain the mechanisms of stability of forest ecosystems in accordance with the principle of invariance of the spatial structure of the formed cenopopulations. The established structural and functional features serve as the basis for deepening the theory of natural regeneration and improving the complex of reforestation measures aimed at preserving biological diversity and forest sustainability with the dominance of species of the genus Pinus.

喀斯特森林常见树种倒木分解对土壤真菌群落组成及分布规律的影响

PDF HTML阅读 XML下载 导出引用 引用提醒 喀斯特森林常见树种倒木分解对土壤真菌群落组成及分布规律的影响 DOI: 10.5846/stxb202101280295 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金项目（32060266，31700385）；贵州省科技计划项目（黔科合基础[2020]1Y124）；贵州省一流学科建设项目（GNYL[2017]007） Effects of fallen woods decomposition of common tree species on soil fungal community composition and distribution in karst forest Author: Affiliation: Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:倒木是森林生态系统的重要组分，其分解调控着土壤的养分循环，同时也影响着土壤微生物群落结构。但目前鲜见关于倒木分解对土壤微生物群落影响方面的报道。选取贵州茂兰喀斯特常绿落叶阔叶混交林中处于轻、中和重度腐烂等级的狭叶润楠（Machilus rehderi）、枫香（Liquidambar formosana）、青冈栎（Cyclobalanopsis glauca）和圆果化香（Platycarya longipes）4种常见树种倒木为研究对象，以距倒木外围的3个不同水平距离（10cm、30cm和50cm）的土壤样品为实验材料，分析倒木树种、腐烂等级和距离对土壤真菌种类及多样性的影响。结果表明：1）喀斯特森林4种树种倒木所影响土壤真菌群落在门级分类上主要为子囊菌门、担子菌门和毛霉门，优势属有Mortierella spp.、Phlebia spp.、Pluteus spp.和Chaetomium spp.等；2）倒木的树种对土壤真菌群落相对丰度的影响有差异，圆果化香倒木下的土壤真菌丰富度Chao1指数显著高于青冈栎；3）随腐烂程度加深，4种树种倒木下的土壤真菌群落多样性呈显著增加趋势；4）土壤真菌群落丰度随着距倒木距离的增大（10-50cm）变化明显，如狭叶润楠影响的Pluteus spp.、Mortierella spp.和Ganoderma spp.，枫香的Chaetomium spp.，圆果化香的Mortierella spp.和青冈栎的Phlebia spp.和Oliveonia spp.等。本研究量化了喀斯特森林倒木所影响的土壤真菌群落组成及分布规律，在一定程度上为倒木分解与土壤微生物群落之间的作用机制的深入探索提供了科学依据。 Abstract:Fallen wood is an important component of the forest ecosystem, which plays an important role in ecological conservation, biodiversity maintenance, and forest renewal. Its decomposition regulates the nutrient cycle of the soil and often changed to changes in microbial community structure of the soil. Therefore, quantify the influence of the fallen wood on soil fungus community and distribution is very significance. However, there are few reports about the effects of decomposition of fallen wood on soil microbial community, especially in Maolan kast evergreen broad-leaved deciduous mixed forest, a rare remaining subtropical karst forest with strong original in China and even the world. In this paper, the fallen woods of four common tree species (Machilus rehderi, Liquidambar formosana, Cyclobalanopsis glauca, and Platycarya longipes) that are in mildly, moderately and severely deciduous decay levels in Maolan's evergreen and deciduous broad-leaved mixed forest in Guizhou are selected as the research object. Three different horizontal distances (10 cm, 30 cm, and 50 cm) from the outer edge of the fallen wood were used to analyze the effects of tree species, decay grade and distance on the types and abundance of soil fungi community. The results show that:1) the soil fungi affected by the fallen woods of the four tree species in the karst forest are mainly Ascomycota, Basidiomycota and Mucor in the phylum classification, and the dominant genera are Mortierella spp., Phlebia spp., Pluteus spp. and Chaetomium spp., etc; 2) Different tree species of fallen woods have different effects on the relative abundance of soil fungi communities. The soil fungi richness Chao1 index under the fallen wood of the Platycarya longipes is significantly higher than that of Cyclobalanopsis glauca; 3) With the deepening of decay, the soil fungal community diversity under the fallen wood of the four tree species showed a significant increasing trend; 4) The abundance of soil fungal communities changes significantly with the increase of the distance from the fallen wood (10- 50 cm), such as Pluteus spp., Mortierella spp. and Ganoderma spp. are affected by Machilus rehderi, Chaetomium spp. of Liquidambar formosana, Mortierella spp. of Platycarya longipes, Phlebia spp. and Oliveonia spp. of Cyclobalanopsis glauca, etc. This study quantified the soil fungal communities composition and distribution patterns affected by fallen woods in karst forests, and provided a scientific basis for further exploration of the mechanism of interaction between soil microbial communities and fallen wood decomposition to some extent. 参考文献 相似文献 引证文献

Silvicultural felling in priority-target silvicultural systems and their use

Considering the issues of the successive development of historically formed systems of silvicultural felling, a certain functional purpose for forest maintenance (thinning), and the replacement of mature stands for timber harvesting and forest renewal (reforestation). The solution of issues is ensured by the formation of priority-functional-target subsystems of silvicultural felling within the framework of the developed priority-target systems of forestry for forests of various purposes - operational, protective. The creation and use of such subsystems predetermine the possibility and necessity of developing an unlimited set of new efficient, environmentally friendly types and options for forest felling that are in demand in the process of forestry development.