Dynamics Of Litterfall Research Articles

Effects of rubber intercropping with native trees on litterfall and litter main nutrient return in Hainan Island, China

Understanding the process of litterfall production is crucial for sustainable development of plantations. However, the underlying dynamics of litterfall and its nutrient return in plantation agroforestry systems remain unclear. In this study, we investigated litterfall, including leaves, branches, flowers, and fruits, in three patterns: Hevea monoculture system (RM), Hevea–Michelia intercropping system (RAS1), and Hevea–Mytilaria intercropping system (RAS2) in Hainan Island, China. Our findings indicate that total litterfall was significantly higher in RAS1 (27,309 kg ha−1) and RAS2 (34,477 kg ha−1) than in RM (22,364 kg ha−1) and was predominantly composed of leaf litterfall in all three patterns, followed by branches, flowers, and fruits. The seasonal dynamics litterfall production of RM, RAS1, and RAS2 showed characteristic patterns. Litterfall nutrients exhibited peak and sub-peak monthly dynamics, peaking from February to March, during the dry season. Total nitrogen (TN), total phosphorus (TP), and total potassium (TK) content of annual litterfall in RAS1 significantly increased by 120 kg ha−1, 30 kg ha−1, and 139 kg ha−1, respectively, compared to those in RM, with percentage increases of 67.88%, 122.79% and 96.27%, respectively. Similarly, TN, TP, and TK content of annual litterfall in RAS2 significantly increased by 185 kg ha−1, 35 kg ha−1, and 170 kg ha−1, respectively, with percentage increases of 103.70%, 159.15% and 139.46%, respectively, for the abovementioned in RM. Litterfall showed a strong correlation with monthly average temperature, monthly minimum temperature, and monthly average wind speed, contributing 80.5%, 75.5%, 69.8%, and 69.6% to the total litterfall and its components, respectively. Further analysis indicated that monthly average temperature, monthly minimum temperature, and monthly average wind speed contributed 73.9%, 43.0%, and 66.6%, respectively, to TN, TP, and TK content of the annual litterfall, highlighting the significant influence of temperature and wind speed. These findings enhance our understanding of carbon and nutrient cycling and contribute to the sustainable management of tropical plantation ecosystems.

Litterfall Carbon and Nitrogen Content of Beech Forests in Serbia

This study aimed to analyze the N storage capacity of litterfall and its impact on C mineralization in beech forests. The research was conducted at 15 sample plots under European beech stands located in different ecological conditions on the territory of Serbia. More than half (53%) of the sample plots are characterized by low and very low litterfall N content (<8 g·kg−1; 9–12 g·kg−1), and a wide C/N ratio, which indicates a slow decomposition of the organic soil layer. These results could be useful indicators of the capacity and dynamics of litterfall N storage and its impact on C mineralization in the context of preserving biodiversity, stability, and longevity of beech forests in Serbia.

Temperature and Precipitation Diversely Control Seasonal and Annual Dynamics of Litterfall in a Temperate Mixed Mature Forest, Revealed by Long‐Term Data Analysis

AbstractLitterfall is a good indicator of overall forest functions in forest ecosystems. Globally, forest litterfall has been extensively investigated, however, there is a lack of long‐term data analysis to show the various litterfall components in relation to environmental factors on the monthly and yearly scales. Here, monthly (May–October) and annual (1981–2018) litterfall including leaves, twigs, bark, reproductive, and miscellaneous fractions were collected in a mixed mature Pinus koraiensis forest on Changbai Mountain in Northeast, China, across 30 years. Based on these long‐term litterfall data, we analyzed the seasonal and annual variations in different litterfall fractions and the internal/external drivers. We observed that both the leaf and total litterfall exhibited a strong, similar seasonal pattern, with the highest levels between September and October, and the annual litterfall had an “S‐shaped” increasing pattern from 1981 to 2018. The other litterfall fractions showed distinct monthly and yearly fluctuations across the 30 years. Mean monthly evapotranspiration and temperature (minimum and maximum) were the best predictors for monthly litterfall. By contrast, the models that best predicted the annual litterfall production included mean annual precipitation and mean monthly precipitation and temperature in May and October. Our study, using a unique dataset of detailed long‐term litterfall dynamics, has potentially major significance for enhancing our understanding of the role of climatic factors controlling forest litterfall amount and seasonality in temperate mixed mature forests. This insight is of paramount importance for modeling and estimating soil carbon sequestration and nutrient cycling of temperate forests under climate change.

Impact of forest thinning on the dynamics of litterfall derived 137Cs deposits in coniferous forest floor after Fukushima accident

The effects of a 50% forest thinning intensity on Fukushima-derived 137Cs deposition by litterfall and its discharge by runoff in hillslope coniferous forest were monitored using four litterfall traps and a hillslope erosion plot. The observation was underway during the pre-and post-thinning periods. Results demonstrated that during the pre-thinning period a total 150 ± 13 g m−2 of litterfall deposited about 924 ± 69 Bq m−2 of 137Cs. This accounts for 11% of the local 137Cs fallout recorded for the study site in the aftermath of the accident. After thinning, both litterfall and 137Cs increased by more than six- and two-fold, respectively. This is possibly owing to the slow individual tree recovery rate assisted by the change on the running space provided by canopy openings, which can accelerate even the normal gust wind to gain damaging power on the unshielded mechanically injured parts of the contaminated residual trees. In both cases, litterfall generally transferred about 37% (3 ± 0.2 kBq m−2) of the local 137Cs fallout onto the forest floor over the observation period. The eroded litter-associated 137Cs increased by about a factor of two after thinning, which only accounted for less than 1% of 137Cs deposited by litterfall. This implies that the forest floor retains 137Cs and remains contaminated regardless of the size of the eroded litter material. But this could become a potential secondary contamination source for the downstream resources such as water bodies and villages, especially at the time of flooding, which in turn calls a serious attention in designing decontamination schemes.

A metabolic scaling theory-driven remote sensing approach to map spatiotemporal dynamics of litterfall in a tropical montane cloud forest

Litter production, or litterfall, is a predominant part of the carbon and nutrient cycles of forest ecosystems. As a major and relatively invariable aspect of primary production, litterfall could be a predictor of total plant production. However, the conventional field approach for its estimation is laborious and costly. High temporal resolution optical satellite imagery may strengthen our ability to estimate litterfall over a vast region, but this remote sensing method is limited in some tropical and near-tropical mountainous regions, mainly due to coarse spatial resolution and frequent cloud coverage. The metabolic scaling theory (MST) states that forest productivity (including litterfall) is directly proportional to the mass of the photosynthesis tissue (leaves), and spatially, it may be isometrically scaled using the size of the largest individual in the system. In this study, we investigated the temporal dimension of the MST and hypothesized that the maximum leaf abundance over a year could also be a key determinant of annual litter production. The relationship between the leaf mass during the peak growing season and annual litterfall could facilitate large-scale litterfall mapping in mountainous terrains, since vegetation indices such as the Enhanced Vegetation Index (EVI) or the Normalized Difference Vegetation Index (NDVI), commonly utilized as a surrogate for leaf abundance, can be derived from relatively high spatial resolution satellite imagery. We correlated the summer growing season Landsat Enhanced Thematic Mapper plus (ETM+) EVI and NDVI for 2016 and 2017 and the temporally corresponding annual accumulated field litterfall data acquired from hinoki (Chamaecyparis spp.) dominant tropical montane cloud forests in northeastern Taiwan (23.98 N, 120.97 E). We found that the summer growing season EVI and NDVI may be salient variables to explain the spatial variation of annual litter production ( r2 = 0.39–0.67, p ≤ 0.01). The results have profound implications for applying MST to the regional mapping of ecosystem production across space and time in humid tropical regions, and these implications may facilitate the remote assessment of the terrestrial carbon budget.

Leaf-litter overyielding in a forest biodiversity experiment in subtropical China

BackgroundThe production and subsequent turnover of aboveground litter is an important process in the ecosystem carbon (C) cycle. Litterfall links above- and belowground processes by transferring organic material to the soil where it becomes available to heterotrophs, fueling nutrient cycling. Little is known about how litter fluxes respond to experimental manipulation of tree species richness.MethodsWe sampled litterfall in a large-scale forest biodiversity experiment in subtropical China. Litter was collected at monthly intervals during peak senescing season for two years and throughout the whole year in 2016, using 0.75 m × 0.75 m litter traps, in plots with a tree species richness of 1, 2, 4, 8 and 16 species.ResultsCumulated annual litter production increased with tree species richness from an average of 1.96 ± 0.25 Mg∙ha− 1∙yr.− 1 in monocultures to 4.39 ± 1.15 Mg∙ha− 1∙yr.− 1 in 16-species mixtures. At site B, the doubling of species richness resulted in a positive effect with peak litter production increasing from 0.09 Mg∙ha− 1 when trees were 5 years old in 2015, to 0.14 Mg∙ha− 1 in 2016. The intra-annual distribution of litter production varied strongly among species, leading to a larger community niche for seasonal distribution of litter in species-rich than in species-poor plots. Community-niche size was positively correlated with litter production, thus providing an explanation for the species richness effects.ConclusionsDifferent species had complementary temporal dynamics of litterfall, which led to a more or less constant litter supply in species-rich stands over the whole year. This caused positive richness effects on litter production which in turn may positively affect mineralization and subsequent tree growth.

Inter- and intra-annual dynamics of vegetation litter at different habitats in Horqin Sandy Land, China.

As one of the important pathways of material and energy flow between plant and soil system, litterfall plays a key role in the process of vegetation and soil restoration in ecologically fragile region. To explore the inter- and intra-annual dynamics of litter production and related regulatory factors at different habitats in sandy land ecosystem, we investigated the litter production during nine continuous growing seasons, while the air temperature and precipitation were measured over mobile dune, fixed dune, and grassland in Horqin Sandy Land. The results showed that annual litter production at different habitants were in the order of mobile dune (9.01 g·m-2) ＜ fixed dune (67.46 g·m-2) ＜ grassland (119.55 g·m-2). The inter-annual dynamics of litterfall fluctuated significantly, with a double-peak curve in fixed dune and "W" curve in grassland. The intra-annual variation of litterfall exhibited a "U" curve at all the three habitats, with peaks appearing in April and September, respectively. Precipitation and temperature had significant effects on the intra-annul dynamics of litterfall production in fixed sand dune and grassland, but had no significant effect on the inter-annual dynamics of litter production at three habitats. Temperature was the major factor affecting the dynamics of the litter fall during the growing season in Horqin Sandy Land.

沂蒙山区不同森林类型凋落物量及其动态特征

沂蒙山区不同森林类型凋落物量及其动态特征

Seasonal Dynamics of Litterfall in a Sub-Alpine Spruce-Fir Forest on the Eastern Tibetan Plateau: Allometric Scaling Relationships Based on One Year of Observations

Litterfall is the primary source of carbon and nutrients that determine soil fertility in forest ecosystems. Most current studies have focused on foliar litter, but the seasonal dynamics and allometric scaling relationships among different litter components (e.g., foliar litter, woody litter, reproductive litter, and epiphytic litter) are poorly understood. Here, we investigated the litter production of various litter components in a sub-alpine spruce-fir forest on the eastern Tibetan Plateau based on one year of observations (from August 2015 to July 2016). Our results showed that total litter production (LT) was 2380 kg·ha−1·year−1 (3% of the aboveground forest biomass), of which 73.6% was foliar litter (LF), 15.6% was woody litter (LW), 3.0% was reproductive litter (LR), 1.3% was epiphytic litter (LE), and 6.5% was miscellaneous material (LM). The total litterfall was bimodal (with peaks occurring in April and October) and was dominated by tree species (85.4% of LT, whereas shrubs accounted for 6.8% of LT). The litter production of evergreen species (68.4% of LT) was higher than that of deciduous species (23.8% of LT). Isometric relationships were observed between litter components and the total litter (i.e., LF∝LT0.99≈1 and LR∝LT0.98≈1), and allometric relationships were also found (i.e., LW∝LT1.40>1 and LM∝LT0.82<1). However, because some components did not exhibit obvious seasonal dynamics (i.e., LE), some relationships could not be expressed using allometric equations (i.e., LE versus LT, LF versus LE, LW versus LE, and LE versus LM). Thus, the different litter components showed different seasonal dynamics, and the total litter dynamics were primarily determined by the variation in foliar litter. In addition, the allometric relationships of the forest litterfall varied with the litter components, functional types (evergreen versus deciduous) and vertical structures (tree versus shrub). This study provides basic data and a new insight for future plant litter studies.

Quantitative analysis of litter-fall in hornbeam-oak-pine stands in the Lviv Roztoche region

AbstractThe aim of the article is to find out if there is a difference between amount of litter-fall in hornbeam-oak-pine stands according to regeneration (naturally and artificially) and age of the stand (middle-aged, mature). We analysed the annual dynamics of litter-fall (litter) and its fractions (needles of Scots pine; leaves of common oak; leaves of associate species; twigs; bark; pine cones; acorns of common oak; seeds of other species; acorn cups, winged seeds; lichens, mosses) in middle-aged hornbeam-oak-pine stands which were regenerated naturally or artificially on the cutover sites following two-stage uniform shelterwood felling and clearcutting, as well as in a mature parent stand (control plot) in the Lviv Roztoche region. Two peaks of organic matter fall have been revealed on both the control plot and the experimental plots: the largest one in October and much lower in May. It was found that the annual mass of litter was 5.8 - 6.6 tons per hectare, the annual weight of litter in the middle-aged hornbeam-oak-pine stands was greater than in the mature stands. Annual dynamics of certain fractions of litter in the stands is preconditioned by the specificity of functioning of the relevant bodies of the trees.

Connecting the litterfall temporal dynamics and processing of coarse particulate organic matter in a tropical stream

We collected leaf litter monthly and analysed how the temporal dynamics of litterfall affect the breakdown rates, microbial and fungal biomass and aquatic invertebrate community in a tropical stream in southern Brazil. The results showed that total annual litterfall varied over time and was negatively associated with rainfall. Litter fell mostly in the spring months, but other peaks occurred throughout the year. In all, 122 tree species were identified; however, only seven represented >70% of the total of leaf litter vertical input. Leaf decomposition was higher in February and April (wet, warm months) than during the wet season. Fungal biomass was high in decomposing leaves (460±28μgg–1 of ash-free dry mass, AFDM), with a maximum of 655μgg–1 AFDM in July. Microbial biomass in decomposing leaves was lower (326±27 nmol g–1 AFDM), with a maximum of 504 nmol g–1 AFDM in October. Monthly variability in the fungal and microbial biomass and aquatic invertebrate colonisation were associated with litter quality. The results suggested that litterfall is the result of regional environmental factors and characteristics of the riparian vegetation and that modifications in the quality, quantity and timing of the delivery of litter input to the stream affect activity in the decomposer community, which then affects monthly litter-breakdown rates.

Forest litterfall and its composition: a new data set of observational data from China

AbstractKnowledge of litterfall production and its allocation is important for understanding nutrient cycling and assessing productivity in forest ecosystems; however, available litterfall datasets are rare in China. Consequently, in the present study, data from published studies (1970–2014) on litterfall and its composition in forest ecosystems in China (excluding Hong Kong, Macao, and Taiwan) were collected, critically reviewed, and incorporated in a comprehensive forest litterfall data set for China. The data set included the following litterfall data: leaves, branches, reproductive parts (flowers and fruits), and miscellaneous. Moreover, associated information was also included, i.e., geographical location (latitude, longitude, altitude, aspect, and slope), climate [mean annual temperature (MAT) and mean annual precipitation (MAP)], stand description (forest type, dominant tree species, stand origin, stand age, mean DBH, mean tree height and stand density), and data collection regime (sample frequency and date, trap size, and number). The data set included 904 entries for 168 study sites, that were distributed in various climate zones with latitudes 18.26°–51.50° N, longitudes 82.25°–129.53° E and altitudes 0–4115 m above sea level (a.s.l.), covering broad climatic gradients (−5.4 to 25.4°C in MAT and 370 to 2800 mm in MAP). The data can be used to analyze spatio‐temporal dynamics of China's forest litterfall and its allocation, understand nutrient cycling and assess productivity in forest ecosystems. Finally, the data set is freely available for noncommercial scientific applications.

Dynamics, structure and chemistry of litterfall in headwater riparian forest in the area of Middle Pomerania

Dynamics, structure and chemistry of litterfall in headwater riparian forest in the area of Middle Pomerania

The effect of stand species composition on water storage capacity of the organic layers of forest soils

The dynamics of litterfall and its quantitative differentiation in stands with different species composition suggest that the origin of the organic matter accumulated in the organic horizons of forest soils affects their physical properties, and thus, their ability to retain rainwater. The main aim of the study was to determine the physical properties, the degree of decomposition and capillary capacity of individual ectohumus sublevels of mountain forest soils, formed under fir stands (Abies alba Mill.) and beech stands (Fagus sylvatica L.), and to compare them with the physical and retention properties of the organic horizons of spruce stands [Picea abies (L.) H. Karst], as determined by Kucza (2007). The study was conducted on soil monoliths, sampled in a way that allowed preserving their natural structure. For individual ectohumus sublevels contained in the monoliths, the content and degree of decomposition of organic matter, bulk density, total porosity and capillary capacity were determined. It has been shown that the capillary capacity of the litter layer (Ol) differed significantly between beech, fir and spruce stands, assuming average values equal to 1.60 (±0.10), 2.76 (±0.11) and 4.44 (±0.10) mm H2O in the layer of 1 cm, respectively. In the case of detritus (Ofh) horizons, the smallest water storage capacity characterized beech stands, wherein the capillary capacity was approximately 1.39 mm lower than in fir stands and over twice lower as compared to spruce stands.

磨盘山天然次生林凋落物数量及动态研究

This study investigated the composition and spatiotemporal dynamics of litterfall at the community scale,on the basis of 144 square traps distributed uniformly in a 5.76 hm2permanent plot located in the deciduous broad-leaved forest of Mopan Mountain. The litterfall samples were collected monthly from April to November in 2006. The results showed that the annual litter production was 3039.6 kg / hm2. The proportion of leaves( 2499.2 kg / hm2) was 82.22%,and that of branches was 9.92%. The combination of flowers,fruits and barks was less than 5%. The leaf litters were from 42 tree species, accounting for 91.30% of the total number( 46) of the tree species in the plot. The main sources of leaf litterfall were Fraxinus rhynchophylla,Juglans mandshurica and Quercus mongolica,accounting for 82.97% of the overall amount. The litterfall exhibited evident spatial heterogeneity,with 200—400g litters in 99 traps and 600g litters in 2 traps. Some traps collected as many as 19 species,but most( 29 traps) did only 12 species. A single-peaked curve described the dynamic of monthly litterfall,and 69. 78% of litterfall occurred in September and October. Leaf litterfall peaked in autumn andexhibited the same temporal trend as the overall litterfall. However,different species peaked in a different manner,with Juglans mandshurica at August and September,Ulmus japonica at September and October,Acer mono at October,and Quercus mongolica at October and November,respectively.

Relationship between dynamics of litterfall and riparian plant species in a tropical stream

We investigated the dynamics of organic matter and type of detritus in a riparian zone of the Atlantic Rain Forest domain, and specifically determined the inputs and stock of detritus contributed by plant species, and their relationship to temperature and precipitation. Our hypotheses tested were: (1) the species composition of riparian vegetation influences the amount and type of detritus delivered to a stream in an Atlantic Rain Forest, and (2) the dynamics of litterfall in the riparian zone is influenced by climate factors. The plant community was formed principally by pioneer and early successional species such as Apuleia leiocarpa, Erytrina velutina, Erytrina verna, Eucalyptus torelliana, Ficus glabra, Ficus insipida, Guarea guidonea, Guarea guidonia, Maprounea guianensis and Psidium guajava. There was a large number of G. guidonea (318 individuals/ha), followed by Cupania oblongifolia (91), Trichilia pallida (52), Piptadenia gonoacantha (26) and E. torelliana (14). G. guidonea contributed >50% of the total litterfall; however, some species which were present in high density in the plant community and did not yield significant biomass, indicating that detritus production was based on the contribution of a few species. We found 697, 856 and 804 g/m2/year from vertical, terrestrial, and lateral inputs, respectively, whereas to the annual benthic standing stock was 3257 g/m2. Detritus was formed by leaves (60%), branches (32%), reproductive parts (3%), and unidentifiable fragments of organic-matter (5%). Inputs and benthic stock were markedly seasonal, with an increase of leaf litter during the dry season. Our results indicate that litterfall dynamics is basically composed of a few species that contribute with higher values of biomass. Moreover, ecological characteristics together with environmental factors can be viewed as the principal factors determining the energy balance of riparian ecosystems. The biological implications of the dynamics of organic matter have high importance for the maintenance and restoration of riparian zones. However, the amount of litterfall required to maintain the balance of the riparian community remains unclear in the tropical zone.

Fine root and litterfall dynamics of three Korean pine (Pinus koraiensis) forests along an altitudinal gradient

Fine root and aboveground litterfall, two large fluxes of nutrients and carbon in the forest ecosystems, are key processes to be considered in efforts of measuring, modeling and predicting soil carbon sequestration. We used sequential coring and litter trap to measure seasonal dynamics of fine root and litterfall in three Korean pine dominated forests along an altitudinal gradient in the Changbai Mountain during the 2012 growing season. Fine root biomass decreased significantly while necromass increased remarkably with altitude. Patterns and amounts of fine root production and mortality varied among forest types. Litterfall decreased significantly with altitude, whereas forest floor mass increased. Carbon inputs through fine root mortality and litterfall decreased significantly with altitude while carbon storage of fine root mass did not differ among forest types and carbon storage of forest floor mass was significantly larger in higher altitudinal forests due to lower turnover rates. This study provided an insight into the variations of fine root and litterfall dynamics among three Korean pine forests which were associated with different vegetation traits and environmental conditions, and also the quantification of carbon fluxes through fine root mortality and litterfall for estimating carbon budget of temperate forest.

Dynamics, structure and properties of plant litterfall in a 120-year old beech stand in Middle Pomerania between 2007-2010

Abstract Studies of plant litterfall mass, its dynamics, structure and chemical composition were conducted between 2007.2010 in a 120-year old beech (Fagus sylvatica L.) stand located in Middle Pomerania. The annual mass of litterfall during the study period ranged from 2.793 to 5.398 t·ha.1 and its maximum was observed during the seed year. Leaves were the major component of plant litterfall and their contribution was 82.4.84.5% in the non-seed years and 47.2% during the seed year. Inflorescences, seeds, and seed coats were important components of litterfall during the seed year and accounted together up to 39.8% of the total litterfall mass. Particular fractions of litterfall significantly differed in the chemical composition. The highest concentrations of nitrogen, phosphorus and potassium were noticed in seeds and leaves collected in spring and the maximum content of calcium was observed in leaves collected in autumn. The weighted mean annual concentrations of nitrogen ranged within 0.81.1.13%, phosphate . 0.126.0.153%, potassium . 0.298.0.485% and calcium . 0.416.0.583%. The influx of elements with litterfall to the soil was: 167.3.225.9 kg·ha-1 of ash, 23.2.61.0 kg·ha-1 of nitrogen, 3.6.7.6 kg·ha-1 of phosphorus, 8.3.26.2 kg·ha-1 of potassium and 15.3.22.4 kg·ha-1 of calcium.

Temporal changes in litterfall, litter decomposition and their chemical composition in Sasa dwarf bamboo in a natural forest ecosystem of northern Japan

We investigated the dynamics of litterfall and litter decomposition of Sasa dwarf bamboo (Sasa senanensis) and trees to clarify the characteristics of organic matter and nitrogen cycling between plant and soil in a natural cool-temperate mixed forest ecosystem dominated by an understory vegetation of Sasa. Mean annual Sasa litterfall over the 3-year study period was 164 g m−2 year−1, which accounted for approximately 29% of total litterfall. Litter decomposition of Sasa leaf and Sasa culm was significantly slower than that of tree leaf during first and second years. The slow decomposition rates of both Sasa litter types were caused by a significantly higher silicate than in tree leaf. Nitrogen concentration in litter increased as decomposition progressed, especially in Sasa leaf and tree leaf. As a result of the slow decomposition of both Sasa litter types, 111 and 73% of nitrogen to the initial amounts were retained in Sasa leaf and Sasa culm after 3 years, respectively. The amounts of retained nitrogen in Sasa leaf, Sasa culm, and tree leaf after 3 years were 1.29, 0.47, and 3.92…−2, respectively, indicating that the differences of litter decomposition rates among the litter types influence on the nitrogen cycling in forest ecosystem through the differences of the nitrogen release from litter.

神农架海拔梯度上4种典型森林凋落物现存量及其养分循环动态

PDF HTML阅读 XML下载 导出引用 引用提醒 神农架海拔梯度上4种典型森林凋落物现存量及其养分循环动态 DOI: 10.5846/stxb201111291822 作者: 作者单位: 三峡大学化学与生命科学学院,中国科学院植物研究所植被与环境变化国家重点实验室 北京,中国科学院植物研究所植被与环境变化国家重点实验室 北京,三峡大学化生学院,中国科学院植物研究所植被与环境变化国家重点实验室 北京 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(30870416); 国家973课题(2010CB951301); 中国科学院战略性先导科技专项资助(XDA050203) Dynamic characteristics of litterfall and nutrient return of four typical forests along the altitudinal gradients in Mt. Shennongjia, China Author: Affiliation: Engineering Research Center of Eco-Environment in the Three Gorges Reservoir Region,Ministry of Education,China Three Gorges University,Yichang,,College of chemistry and life science,China Three Gorges University,Yichang, State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,,,Chinese Academy of Sciences 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:研究神农架地区典型森林凋落物现存量及其养分动态对认识我国北亚热带森林生态系统养分循环过程及森林碳循环的机理具有重要的参考价值。通过对神农架海拔梯度上4种典型森林常绿阔叶林、常绿落叶阔叶混交林、落叶阔叶林及亚高山针叶林凋落物年凋落量及其养分归还量的研究,发现:森林凋落物量随海拔增加呈现先上升后降低的趋势,由低海拔到高海拔,凋落物年凋落量分别为6807.97、7118.14、6975.2和4250.67 kg/hm2。各森林类型凋落物量年变化呈双峰型,高峰期出现在4-5月份、11月份。凋落物养分归还以N 最高(132.06、162.29、157.12和185.77 kg/hm2),以P最少(4.62、4.39、8.24和4.15 kg/hm2),养分归还总量随海拔高度增加而减少。 Abstract:To explore the litterfall and their seasonal dynamics of the four typical forests along the altitudinal gradient in Mt. Shennongjia, Hubei. We measured litterfall of Evergreen broad-leaved forest (EBF), Mixed evergreen and deciduous broad-leaved forest (MF), Deciduous broad-leaved forest (DBF), and sub-alpine coniferous forest (CF) in Shennongjia. Litterfall collection was conducted monthly from September 2009 to January 2011. The result showed that the total annual litterfall of the four typical forests along the altitudinal gradient in Mt. Shennongjia was increased and then decreased along the altitude. The annual amounts of EBF was 6 807.97 kg/hm2, MF 7 118.14 kg/hm2, DBF 6 975.2 kg/hm2 and CF 4 250.67 kg/hm2. The seasonal dynamics of litterfall iccurred two peaks during the periods from April to May and November annually. The returns of N from the littlefall of four forests along the elevation gradients were 132.06, 162.29, 157.12 and 185.77 kg/hm2, and that of P was 4.62, 4.39, 8.24 and 4.15 kg/hm2. 参考文献 相似文献 引证文献