Secondary Forest Ecosystems Research Articles

The bioindicator role of phytonematode groups in the assessment of the state of transformation of secondary forest ecosystems

The methodology for assessing the state of terrestrial ecosystems using diagnostic properties of soil microfauna remains underestimated in contemporary Ukrainian science. We have analyzed a significant amount of foreign and domestic literature to demonstrate the importance of this aspect in the overview article concerning the monitoring of natural ecosystems. Based on our own research results, we have shown the outcomes that can be achieved by utilizing the bioindicative properties of a specific group of organisms, such as phytonematodes. The fundamental principles and methodologies that should be applied, including using the functional characteristics of phytonematode complexes, have also been described. For evaluating the state of ecosystems, the most valuable information pertains to organisms that are widely distributed over a significant territory, have high population density, play a significant role in ecosystem functioning, and can rapidly respond to environmental changes. Organisms fitting these criteria can be considered bioindicators. This group of organisms is sensitive to natural or anthropogenic environmental transformations and can respond to them by altering their population density, distribution, or specific characteristics. Therefore, the use of soil animals from specific taxonomic groups as bioindicators has a long-standing tradition. Groups of soil invertebrates are integral structural components of natural ecosystems, together providing them with stable development and resilience. Assessment of the functional role of soil fauna in the ecosystem involves establishing the structural-functional organization of different groups of soil invertebrates, which differ both morphologically and functionally in the ecosystem and their impact on soil-forming processes. The use of soil nematodes as bioindicators is promising for evaluating the sanitary condition of forest ecosystems based on the indicator of energy utilization by trophic groups of nematodes, as well as for bioindication of soil quality based on the relative ratio of persisters and colonizers. The zoological method of soil diagnostics was established as a separate scientific direction thanks to the works of M.S. Gilyarov. This method is based on the presence of certain species of invertebrates in the soil and the analysis of the structure of their communities. Later, it found practical application in the research of forest ecosystems. Therefore, nematodes are an effective model group for the indirect assessment of the zoocenosis’ state.

Litter decomposition and nutrient release are faster under secondary forests than under Chinese fir plantations with forest development

In terrestrial ecosystems, leaf litter is the main source of nutrients returning to the soil. Understanding how litter decomposition responds to stand age is critical for improving predictions of the effects of forest age structure on nutrient availability and cycling in ecosystems. However, the changes in this critical process with stand age remain poorly understood due to the complexity and diversity of litter decomposition patterns and drivers among different stand ages. In this study, we examined the effects of stand age on litter decomposition with two well-replicated age sequences of naturally occurring secondary forests and Chinese fir (Cunninghamia lanceolata) plantations in southern China. Our results showed that the litter decomposition rates in the secondary forests were significantly higher than those in the Chinese fir plantations of the same age, except for 40-year-old forests. The litter decomposition rate of the Chinese fir initially increased and then decreased with stand age, while that of secondary forests gradually decreased. The results of a structural equation model indicated that stand age, litter quality and microbial community were the primary factors driving nutrient litter loss. Overall, these findings are helpful for understanding the effects of stand age on the litter decomposition process and nutrient cycling in plantation and secondary forest ecosystems.

Effects of historical land use and recovery pathways on composition, structure, ecological function, and ecosystem services in a Caribbean secondary forest

Regenerated secondary forests in the tropics are resilient ecosystems. Differences in land-use history and disturbance, abiotic and biotic site conditions, and successional pathways can influence secondary forest biodiversity, structure, ecological functions, and ecosystem services. However, studies assessing the supply of ecosystem services of secondary forests are limited. We examined trees in plots located across late successional stage secondary forest in the Luquillo Experimental Forest, Puerto Rico with three combinations of historical canopy cover (circa 1936) and post-agricultural recovery pathways: (1) > 50% canopy cover and passive regeneration (>50 P), (2) < 50% canopy cover and passive regeneration (<50 P), and (3) < 50% canopy cover and assisted + passive regeneration (<50 A+P). Using i-Tree Eco methodology, we investigated if differences in historical cover and passive vs assisted natural regeneration resulted in differences in composition and structure, hydrological functions, and estimated regulating ecosystem services, and compared the results between native and non-native species. The <50 P plots had greater species richness than the >50 P and <50 A+P plots, while the <50 A+P plots had significantly greater DBH, height, basal area, aboveground biomass, and estimated quantities of evaporation and transpiration, carbon storage, and removal of airborne contaminants compared to the other recovery pathways. Differences among plot groups can be attributed to historical management actions in concert with successional trajectories characteristic of novel secondary forests. Native species dominated throughout these secondary forests and cumulatively exhibited services that were 1.3 to 3.5 times greater than those of non-native species. However, non-native trees contributed disproportionally to basal area and aboveground biomass, and thus to some ecosystem services. Both natives and non-natives exhibited service provision that varied significantly with diameter size class and service type, and large trees were observed to be dominant service providers irrespective of species origin. Our study marks the first landscape-scale quantitative assessment of forest composition, structure and ecological functioning that is explicitly linked to exploring regulating ecosystem services within the montane secondary forest in Puerto Rico and expands representation of this research from the Caribbean. The findings underscore the role of historical land use and recovery pathways in driving services of tropical forests and show how ecosystem functions can vary in accordance with dynamic structural attributes of individual trees. This research can provide a useful point of comparison for analysis of biomass accumulation, ecosystem service provision, and evaluating service tradeoffs associated with forest structure in other recovering and old-growth tropical landscapes.

Abundance and diversity of soil arthropods in the secondary forest and park at the University of Bengkulu

Soil ecosystems are ecosystems related to the degradation of organic matter. University of Bengkulu is an area that has two kinds of soil ecosystems; secondary forest ecosystems and park ecosystems. Arthropods are one of the faunas living in the University of Bengkulu campus ecosystem. Camponotus dominates the secondary forest area, while Solenopsis dominates the park ecosystem. Data were obtained from two ecosystems (secondary forest ecosystem and park ecosystem). The results show that there are five classes with 199 individuals, while in the park ecosystem, there are four classes with 250 individuals.The secondary forest ecosystem diversity index value is 2,73, and the ecosystem diversity index value is 1,91. The evenness index value of the secondary forest ecosystem is 0,78, and the park ecosystem is 0,76. The secondary forest ecosystem dominance index value is 0,09, and the park ecosystem dominance index is 0,17. The diversity of soil arthropods in secondary forest and park ecosystems is in the category of moderate diversity. The even distribution of soil arthropods in both ecosystems is high. Moreover, there is no dominance by one type of soil arthropods in both ecosystems. The diversity of arthropods in the secondary forest ecosystem is higher than that of the park ecosystem. The number of individuals in the park ecosystem is higher than in the secondary forest ecosystem. In both ecosystems, the most commonly found are from the Formicidae family

Seasonality of albedo and fraction of absorbed photosynthetically active radiation in the temperate secondary forest ecosystem: A comprehensive observation using Qingyuan Ker towers

Seasonality of albedo and fraction of absorbed photosynthetically active radiation in the temperate secondary forest ecosystem: A comprehensive observation using Qingyuan Ker towers

Characteristics of the soil arbuscular mycorrhizal fungal community along succession stages in tropical forest and its driving factors

Arbuscular mycorrhizal fungi play an important role in mediating plant-soil interactions across succession stages. However, AMF community dynamics which about the change of community composition and member activity remain unclear. To complete the gap knowledge about microbial community dynamics during restoration succession, soil AMF community composition was studied within a tropical forest ecosystem in the Ganshiling nature reserve using high throughput sequencing methods. The results revealed that soil AMF communities characteristics about speices diversity, species composition and microbial correlation network showed significant differences between shrubland (SC) and secondary forest ecosystems, but the same differences were not found between 40-year recovery secondary forest (SF40) and 60-year recovery secondary forest (SF60). Plant community dynamics were the key factor for regulating soil AMF communities among succession stages. An important biotic factor explaining variance in AMF community composition was root biomass. The correlation network analysis showed that although the nodes were similar among succession stages, the complexity of networks was significant higher in SF40 than in SC and SF60, suggesting that AMF communities were more active in SF40, which verified the hypothesis of intermediate disturbance hypothesis. This study provides new insights into AMF community dynamics and their driving factors across succession stages, as well as expanding knowledge of the ecological value of AMF for tropical forest restoration processes.

Quantifying Arborescent Flora Diversity in a Secondary Forest Ecosystem: A Comprehensive Assessment in Nambalan, Mayantoc, Tarlac, Philippines

Quantifying Arborescent Flora Diversity in a Secondary Forest Ecosystem: A Comprehensive Assessment in Nambalan, Mayantoc, Tarlac, Philippines

Spatial distribution of vegetation diversity, timber production, and carbon storage in secondary tropical rainforest at South Kalimantan, Indonesia

Abstract. Suyanto, Nugroho Y, Harahap MM, Kusumaningrum L, Wirabuana PYAP. 2022. Spatial distribution of vegetation diversity, timber production, and carbon storage in secondary tropical rainforest at South Kalimantan, Indonesia. Biodiversitas 23: 6147-6154. Sustainable management in secondary tropical rainforests requires basic information about stand characteristics, mainly related to productivity and biodiversity. This study aimed to quantify vegetation diversity, timber production, and carbon storage from various sites of secondary forests in South Kalimantan. Forest inventory was conducted using a census method at seven different natural forest management unit compartments. Four parameters were measured from each tree, including the type of species, commercial categories, tree diameter, and tree height. Individual tree volume and biomass were estimated using allometric equations, while carbon storage was determined using a conversion factor from biomass. Three indicators were used to evaluate vegetation diversity: richness, heterogeneity, and evenness. The analysis of correlations was applied to examine the relationship between vegetation diversity and stand productivity with a significant level of 5%. Results found that there were 41 tree species in the study site comprising 20 commercial and 21 non-commercial species. The highest richness (R') was recorded in compartment 18X by approximately 4.0, while the most increased heterogeneity (H') and evenness (E') were observed in compartment 18Y by around 2.4 and 0.7, respectively. The accumulation of timber production varied in each site, with a range of 45.46-68.32 m3 ha-1. The highest carbon storage was noted in compartment 19Y (38.74±1.79 t C ha-1), while the lowest was found in compartment 18W (20.76±0.93 t C ha-1). The relative contribution of commercial species to timber production and carbon storage was substantially higher than non-commercial species at all sites. However, there was not a significant correlation between vegetation diversity and stand productivity (P&gt;0.05). Overall, our study concluded that the secondary tropical forest ecosystems in the site had good vegetation diversity, timber production, and carbon storage.

A healthier water use strategy in primitive forests contributes to stronger water conservation capabilities compared with secondary forests

Water conservation is an important ecological function of forest ecosystems, plant water use strategy is a key factor in regulating forest ecosystem water balance. However, there are still insufficient studies on the water conservation capacity and water use strategies of different forest types, especially in climate-sensitive areas. In this study, we determined the stable isotope values (δD, δ18O and d-excess) of plant water, soil water and precipitation from two typical stand types (primary forest and secondary forest) on Changbai Mountain to reveal plant water use and evaluated the water conservation capacity. The results indicated that rainwater infiltrated into the soil combined with piston flow and preferential flow in the primary forest, and preferential flow was the only form of flow in the secondary forest. The main tree species in the primary forest formed a relatively stable water use niche. Among them, the water use pattern of Quercus mongolica Fisch. ex Ledeb (Qm.) was transformed between shallow and deep soil layers with strong ecological plasticity. The dominant species in secondary forest derived water from similar soil layers with intense interspecific competition. By comparing the water use patterns, the secondary forest conformed to the hypothesis of “two water worlds”, while the primary forest conformed to the hypothesis of one reservoir. The primary forest ecosystem had stronger water conservation capacity than secondary forest ecosystem due to the regulable water use strategies of plants and the stable water conservation capacity of the soil. These results will provide theoretical support and a reference for plan future forest management strategies in the climate-sensitive areas.

Improvements in soil health and soil carbon sequestration by an agroforestry for food production system

Woody perennial cropping systems have the potential to produce food while maintaining or improving soil health relative to annual cropping systems. We used space-for-time substitution to assess soil health improvements by a Chinese chestnut – pawpaw agroforestry (AF) system in Iowa, USA relative to corn – soybean rotation (CSR), representing conventional annual crop management, and secondary forest (SF), which served as a natural woody perennial ecosystem reference point for improved soil health. We also compared several Chinese chestnut (Castanea mollisima Blume) and pawpaw (Asima trilobal (L.) Dunal) AF guilds, including single and double density chestnut monoculture, pawpaw monoculture, and chestnut and pawpaw polyculture, to evaluate the effects of tree density versus diversity on soil health. We found significant improvements in biogeochemical metrics of soil health for a mature (24 years old) AF system established on fields previously in annual crop production, relative to an adjacent no-till CSR system. Surface soil (0–30 cm depth) total and microbial stocks of carbon and nitrogen in the agroforestry system were greater in AF than in CSR, but less than in the SF. Soil carbon stocks down to one meter increased from CSR (62.7 Mg C ha-1 ± 3.22 SE) to AF (72.1 Mg C ha-1 ± 2.23 SE) and SF systems (80.8 Mg C ha-1 ± 4.46 SE), but did not differ between the two perennial systems. Acid - base chemistry in surface soils was similar between AF and CSR, but SF ecosystems had significantly higher pH, CECe, and percent base saturation than both cropping systems. We found few effects of AF guild (i.e. groupings of woody crop species) on the biogeochemical metrics of soil health, suggesting that modest increases in woody perennial crop density and diversity did not lead to further improvements to soil health. Overall, land conversion to agroforestry from annual crop production improved soil health and increased soil carbon sequestration.

The impact of landslides on chemical and microbial properties of soil in a temperate secondary forest ecosystem

The impact of landslides on chemical and microbial properties of soil in a temperate secondary forest ecosystem

Research on assessment of the diversity and similarity of cicadas (Hemiptera: Cicadidae) in the Northwest region

There have been many research works on cicadas of the Cicadidae, but they have only researched and evaluated diversity in a conservation area, or a national park in the Northwest, without a comprehensive study on them. In this study, the authors have collected and used biodiversity indices to calculate biodiversity indexes of cicadas in the Northwest region. Results showed that the cicada species in the Cicadidae had the highest diversity in the old-growth forest ecosystem, decreasing gradually in the secondary forest ecosystem and the lowest in the secondary forest ecosystem. The species composition of the Cicadidae at an altitude above 1,000 m is more diverse than that at an altitude below 1,000 m (the difference is statistically significant). At the elevation above 1,600 m, the species composition is small but endemic to the Northwest region.

Cascading effect of source limitation on the granivore-mediated seed dispersal of Korean pine (Pinus koraiensis) in secondary forest ecosystems

BackgroundGranivore-mediated seed dispersal is susceptible to changes in seed availability and silvicultural management, which alters synzoochorous interactions in the antagonism-mutualism continuum and affects the seed dispersal effectiveness (SDE), and eventually, the plant recruitment. We conducted a whole-year study of seed addition to quantify the granivores-Korean pine (Pinus koraiensis) synzoochorous interactions and the SDE in the same secondary forests with two treatments. Both treatments had seed source limitations: one was caused by the disappearance of Korean pine due to the historical disturbance, the other by pinecone harvesting in Korean pine plantations adjacent to the secondary forests. Thinning with different intensities (control, 25%, and 50%) were also performed to further explore the synzoochorous interactions and SDE in response to silvicultural management in the second type of forests.ResultsSource limitation increased the proportion of pre- and post-dispersal seed predation, and made the granivores-Korean pine interaction shift more towards antagonism, with the estimated SDE of 2.31 and 3.60, respectively, for the secondary forests without and with Korean pine. Thinning with different intensities did not alleviate the reactions towards antagonism but altered SDE; granivores occurrence decreased, but the proportion of pre- and post-dispersal seed predation increased, resulting in a fivefold decreased seedling recruitment in 25% thinning (the lowest SDE of 0.26).ConclusionThe source limitation coupling thinning biased the synzoochorous interactions more towards antagonism and significantly lowered granivore-mediated SDE, which limited the successful recruitment of Korean pine in secondary forests. Forest managers should control pinecone harvesting, protect the synzoochorous interaction, and take into account masting event for Korean pine regeneration in the future.

Mechanism Underlying Microbial Community Assembly in the Qinling Secondary Forest Ecosystem

Mechanism Underlying Microbial Community Assembly in the Qinling Secondary Forest Ecosystem

Effects of canopy composition on snow depth and below-the-snow temperature regimes in the temperate secondary forest ecosystem, Northeast China

Seasonal snow cover provides a thermally stable and humid refuge for overwintering plants in temperate forests. Canopy composition changes snow processes and shapes the thermal regime. To explore canopy effects on snow depth (SD) and below-the-snow temperature, ultrasonic sensors and time-lapse infrared cameras were used to monitor SD over two winters. Three forest types with different canopy compositions [the ratio of Korean pine (Pinus koraiensis Sieb. et Zucc.) basal area, RKp] on adret (sunny) and ubac (shady) slopes, including broadleaved secondary forests, Korean pine-broadleaved mixed forests, and Korean pine plantations, were selected as sample sites. Results showed time-lapse cameras were more accurate for monitoring SD in studied forests. Increasing RKp increased the snow interception rate and reduced the peak SD, snow melting rate, and snow cover duration. 21–69% of the snowfall was intercepted by the forests, with the RKp explaining 89% of the variance in interception rates. All forest stands had the lowest interception rate for severe snow events. For each forest type, plots on ubac slopes had a lower interception rate and thicker snow cover due to the positive effects of prevailing northerly wind on snow accumulation. Inter-annual variation of snowfall affected SD, snow melting rate, and below-the-snow temperature, with smaller differences among forest stands during the below-normal snow winter (2018/2019). The subnivium established in all plots during the normal snow winter (2019/2020) with the longest maintenance in secondary forest on ubac slopes and the shortest maintenance in Korean pine forests. The temperature increment under snowpack was positively correlated with SD while negatively correlated with air temperature. Overall, the forest with fewer evergreen canopy compositions was covered with thicker snowpack for a longer duration and had a more stable and warmer temperature regime, and fewer freeze-thaw events beneath the snow, which were essential for safe overwintering of regenerated individuals.

Abundance, distribution and substrate association of Hong Kong stag beetles (Coleoptera: Lucanidae) in secondary forests

Abstract Ecological studies conducted on lucanids in Asia are limited, resulting in considerable knowledge gaps in the fundamental ecology of these charismatic species (e.g. larval substrate associations), despite their potential importance in wood decomposition. We conducted 25 transect surveys in secondary forest sites in Hong Kong and sampled wood parameters and site‐level wood availability data to test whether these habitat features significantly affected abundance or occurrence of lucanids. Out of 412 wood fragments sampled, we found two species: Prosopocoilus oweni was broadly distributed across sites (but still uncommon at the level of wood fragments occurring in 6.07%) while Nigidius sinicus was comparatively rarer (occurring in 0.73% of examined wood fragments). The dominant species P. oweni was more likely to appear in wood fragments in later decay stages and can be classified as a secondary forest generalist with respect to wood resource utilisation. The surveys failed to detect four additional lucanid species known in Hong Kong (Neolucanus sinicus, E. gracilis, P. biplagiatus, and Aegus chelifer) potentially because of their rarity or usage of other habitats or microhabitats. Protection of existing secondary forests in Hong Kong is recommended to secure supply of suitable habitat and resources. Results obtained by standardised surveys can furthermore serve as a baseline for future assessment of lucanid population change. This study provides ecological insights into lucanids within secondary forest ecosystems of subtropical and tropical Asia.

ALLOMETRIC MODELS FOR ESTIMATING TREE BIOMASS OF DRYLAND SECONDARY FOREST IN EAST HALMAHERA

Pendugaan biomassa hutan sekunder diperlukan untuk mendukung pengurangan emisi karbon dioksida melalui peningkatan cadangan karbon hutan. Umumnya, biomassa hutan diduga secara tidak langsung menggunakan model-model alometrik biomassa pohon yang disusun berdasarkan pengambilan sampel destruktif dari sejumlah pohon contoh. Ketersediaan model-model alometrik biomassa untuk hutan sekunder di Indonesia masih terbatas, khususnya untuk ekosistem hutan sekunder di bagian timur Indonesia. Penelitian ini bertujuan untuk menyusun model-model alometrik biomassa pohon jenis campuran di hutan sekunder Halmahera Timur, Maluku Utara, serta untuk membandingkan akurasi model-model alometrik lokal tersebut dengan model-model alometrik lain yang umum digunakan dalam pendugaan biomassa hutan sekunder. Pengukuran biomassa pohon dilakukan secara destruktif terhadap 18 pohon jenis campuran (dengan kisaran diameter 5,4 – 36,9 cm) di hutan sekunder. Sampel-sampel dari tiap bagian pohon (batang, cabang, ranting, dan daun) dianalisis di laboratorium untuk menentukan biomassa tiap pohon contoh. Model-model alometrik disusun menggunakan analisis regresi non-linier, yang kemudian dibandingkan dengan model-model alometrik lain. Penelitian ini menunjukkan bahwa biomassa pohon jenis campuran di lokasi penelitian dapat diduga secara akurat menggunakan model M7 yang menggunakan peubah diameter, tinggi dan kerapatan kayu. Model alometrik lokal tersebut lebih akurat dibandingkan dengan model-model alometrik lain yang umum digunakan untuk pendugaan biomassa hutan tropis. Alternatifnya, model M3 yang menggunakan peubah diameter dan tinggi juga dapat digunakan ketika data kerapatan kayu tidak tersedia. Model-model alometrik lokal dari penelitian ini dapat memperkaya ketersediaan model-model alometrik biomassa untuk ekosistem hutan sekunder di bagian timur Indonesia.

Allometric Models for Estimating Tree Biomass of Dryland Secondary Forest in East Halmahera

Biomass estimation of secondary forests is required to support the emission reduction of carbon dioxide through an enhancement of forest carbon stocks. Commonly, forest biomass is indirectly estimated using tree biomass allometric models that are developed based on a destructive sampling of sample trees. The availability of biomass allometric models for secondary forests in Indonesia is still limited, particularly for secondary forest ecosystems in eastern Indonesia. This study aimed to develop allometric biomass models for mixed-species trees in a secondary forest of East Halmahera, North Maluku, and to compare their accuracies with some other allometric biomass models that commonly used for estimating biomass of secondary forests. The tree biomass measurement was conducted by using a destructive sampling of 18 mixed-species trees (with diameter range of 5,4 – 36,9 cm) in a secondary forest. The samples of each tree component (stem, branch, twig, and leaf) were analyzed in a laboratory to determine the biomass of each sample tree. Allometric models were developed by using a non-linear regression analysis, which were then compared with other allometric models. This study revealed that the biomass of mixed-species trees in the study area could be estimated accurately using the M7 model that used diameter, height, and wood density variables. Such local allometric model was more accurate than other allometric models commonly used for estimating tropical forest biomass. Alternatively, the M3 model that used diameter and height variables could also be used when wood density data was not available. The local allometric models from this study can enrich the availability of biomass allometric models for secondary forest ecosystems in eastern Indonesia.

Not so stressful after all: Epiphytic individuals of accidental epiphytes experience more favourable abiotic conditions than terrestrial conspecifics

Vascular epiphytes are mainly associated with tropical and subtropical forest ecosystems. However, the frequent occurrence of accidental epiphytes in temperate forests proves that epiphytic growth of vascular plants is possible in tree crowns at these latitudes. Comparing the abiotic conditions of epiphytic and terrestrial microhabitats in conjunction with intraspecific differences in functional traits of the inhabiting plants, we identified limitations to vascular epiphytism in the study area in a Central European low mountain range. We determined light availability, winter temperatures, soil moisture, nutrient concentrations, and pH of arboreal soil in crotches of broad-leaved trees and in the immediate vicinity of each tree on the ground. Similarly, we quantified total plant water content, relative foliar chlorophyll content, specific leaf area (SLA), leaf dry matter content (LDMC), root-mass fraction, and aboveground nutrient concentrations of 110 pairs of epiphytic and terrestrial conspecifics. Water and nutrient availability were generally high in crotches filled with arboreal soil, suggesting better growth conditions than on the ground. A trophic advantage of epiphytic individuals over terrestrial conspecifics can be deduced from higher plant nutrient concentrations, higher SLA, and lower LDMC. Advantageous growth conditions might even result in higher growth rates and higher fitness of epiphytic individuals. Our findings highlight that vascular epiphytism in the study area is not necessarily limited by abiotic conditions but at least partly by the availability of old and structurally diverse trees providing suitable microhabitats. Accordingly, management actions in these secondary forest ecosystems should incorporate the preservation of old and large deciduous trees in order to sustain arboreal microhabitats and the associated biota.

ANÁLISE DE NDVI E TEMPERATURA DA SUPERFÍCIE TERRESTRE UTILIZANDO A PLATAFORMA DO GOOGLE EARTH ENGINE EM ÁREA DE SAVANA AMAZÔNICA E FLORESTA SECUNDÁRIA, NO MUNICÍPIO DE VIGIA – PA

A Savana Amazônica é um ecossistema com carência de estudos científicos sobre os efeitos das mudanças de uso da terra e da temperatura da superfície terrestre. Além disso, as florestas secundárias na Amazônia são áreas que podem ser afetadas pelas mudanças de uso da terra, haja vista o seu relacionamento fronteiriço com a savana. Neste sentido, o presente estudo teve como objetivo: i) analisar o Índice da Vegetação por Diferença Normalizada (NDVI) em regiões de Savana amazônica e floresta secundária e ii) verificar o comportamento da temperatura superficial da terra no município de Vigia, Estado do Pará utilizando a plataforma Google Earth Engine (GEE). Justifica-se a escolha do município de Vigia devido o seu território comportar ecossistemas de savana e floresta secundária e sofrer pressões humanas devido à inflexão de atividades agropecuárias ao longo dos anos. Os resultados do estudo revelaram que as temperaturas da superfície terrestre em Vigia giram em torno dos 28,91°C (mínima) e 31,71°C (máxima). Além disso, os NDVI próximos de 1 em áreas de floresta secundária, exceção do ano de 2014 (0,23) mostram que apesar das mudanças antrópicas na terra, o ecossistema conserva boa parte de sua vegetação, onde a plataforma GEE se mostra capaz de auxiliar no planejamento e monitoramento de áreas de savana e floresta secundária.