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Journal of forestry Research 2014年第1期25卷 171-176页

作者： Alex Asase Bismark K.Asiatokor Kwasi Ofori-Frimpong Department of Botany University of Ghana Environmental Science Programme University of Ghana Cocoa Research Institute of Ghana (CRIG)

We investigated the effects of selective logging disturbances on tree diversity and soil characteristics in the Bia Conservation Area in southwest Ghana. The study was conducted in unlogged, 29-35 years post-logged and swamp forests using ten 25 m× 25 m plots. In total, we identified 310 individual trees belonging to 87 species. Mean Shannon-Weiner index was highest in the post-logged forest but there were no significant differences in tree density, dominance, or DBH size class distributions between these forests. Soil physical properties such as pH and bulk density up to 30 cm depth were similar in the two of forests In terms of soil nutrient status, available P, exchangeable K and total N contents were all similar in the unlogged and post-logged forests. Our findings suggest that the effects of logging on tree diversity are compara-tively long-term, in contrast to its short-term effects on some top soil physical and chemical characteristics.

关键词： tropical forest deforestation plant diversity soil propertiesGhana

Plant-frugivore interactions in an intact tropical forest in north-east Thailand

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Integrative Zoology 2011年第3期6卷 195-212页

作者： Wangworn SANKAMETHAWEE Andrew J.PIERCE George A.GALE Britta Denise HARDESTY Conservation Ecology Program School of Bioresources and TechnologyKing Mongkut’s University of Technology ThonburiBangkok Thailand Walai Rukhavej Botanical Research Institute Mahasarakham UniversityMahasarakhamThailand CSIRO Ecosystem Sciences AthertonQueenslandAustralia

Fleshy-fruited plants in tropical forests largely rely on vertebrate frugivores to disperse their *** this plant-animal interaction is typically considered a diffuse mutualism,it is fundamental as it provides the template on which tropical forest communities are *** applied a mutualistic network approach to investigate the relationship between small-fruited fleshy plant species and the fruit-eating bird community in an intact evergreen forest in north-east Thailand.A minimum of 53 bird species consumed fruits of 136 plant ***-avian frugivore networks were highly asymmetrical,with observed networks filling 30%of all potential *** some of the missing links in the present study might be due to undersampling,forbidden links can be attributed to size constraints,accessibility and phenological uncoupling,and although the majority of missing links were unknown(58.2%),many were probably due to a given bird species being either rare or only a very occasional fruit *** most common frugivores were bulbuls,barbets and fairy-bluebirds,which were responsible for the majority of fruit removal from small fleshy fruited species in our *** birds seemed to be a minor component of the plant-frugivore networks,accounting for only 3%of feeding visits to fruiting trees;they filled 2%of the overall potential *** majority of interactions were generalized unspecific;however,Saurauia roxburghii *** to be dependent on flowerpeckers for dispersal,while Thick-billed Pigeons were only seen to eat figs.

关键词： avian frugivore nestedness plant-frugivore networks seed dispersal tropical forest

Effects of tropical forest conversion into oil palm plantations on nitrous oxide emissions:A meta-analysis

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Journal of forestry Research 2023年第3期34卷 865-869页

作者： Taiki Mori Kyushu Research Center Forestry and Forest Products Research InstituteFFPRIKurokami 4-11-16Kumamoto 860-0862Japan

Oil palm plantations have dramatically expanded in tropical Asia over the past *** their establishment has been projected to increase nitrous oxide(N_(2)O)emissions,earlier reports have shown inconsistent *** study analyzed these previously published data to compare N_(2)O emissions in oil palm plantations to reference forests.A linear mixed-eff ects model was used to examine the signifi cance of the eff ect of establishing oil palm plantations on N_(2)O emissions,rather than to calculate mean eff ect sizes because of limitations in the data *** results indicated that N_(2)O emissions were signifi cantly greater from oil palm plantations than from reference forests,as *** is the fi rst study to report the eff ect of oil palm plantations on N_(2)O emissions by synthesizing previously published *** quantify the size of this eff ect,additional studies with frequent and long-term monitoring data are needed.

关键词： Meta-analysis Nitrogen fertilization Nitrous oxide Oil palm plantation tropical forest

Effect of disturbance on biomass,production and carbon dynamics in moist tropical forest of eastern Nepal

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forest Ecosystems 2016年第3期3卷 221-230页

作者： Tilak Prasad Gautam Tej Narayan Mandal Department of Botany Mahendra Morang Adarsha Multiple CampusTribhuvan University Department of Botany Post Graduate Campus Tribhuvan University

Background： forest biomass is helpful to assess its productivity and carbon （C） sequestration capacity. Several disturbance activities in tropical forests have reduced the biomass and net primary production （NPP） leading to climate change. Therefore, an accurateestimation of forest biomass and C cycling in context of disturbances is required for implementing REDD （Reducing Emissions from Deforestation and forest Degradation） policy. Methods： Biomass and NPP of trees and shrubs were estimated by using allometric equations while herbaceous biomass was estimated by harvest method. Fine root biomass was determined from soil monolith. The C stock in vegetation was calculated by multiplying C concentration to dry weight. Results： Total stand biomass （***-1） in undisturbed forest stand （US） was 960.4 while in disturbed forest stand （DS） it was 449.1. The biomass （***-1） of trees, shrubs and herbs in US was 948.0, 4.4 and 1.4, respectively, while in DS they were 438.4, 6.1 and 1.2, respectively. Total NPP （***-1） was 26.58 （equivalent to 12.26 Mg ***-1） in US and 14.91 （6.88 Mg ***-1） in DS. Total C input into soil through litter plus root turnover was 6.78 and 3.35 ***-1 in US and DS, respectively. Conclusions： Several disturbance activities resulted in the significant loss in stand biomass （53 %）, NPP （44 %）, and C sequestration capacity of tropical forest vegetation is far greater than that returned to the soil n eastern Nepal. The net uptake of carbon by the by the turnover of fine root and litter. Therefore, both stands of present forest act as carbon accumulating systems. Moreover, disturbance reflects higher C emissions which can be reduced by better management.

关键词： tropical forest Disturbance Biomass Production Carbon cycling Nepa

Progresses on SAR Remote Sensing of tropical forests:forest Biomass Retrieval and Analysis of Changing Weather Conditions

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Journal of Geodesy and Geoinformation Science 2021年第1期4卷 88-93页

作者： Stefano TEBALDINI Xinwei YANG Yu BAI Mauro Mariotti D’ALESSANDRO Mingsheng LIAO Wen YANG DEIB Politecnico di MilanoMilan 20133Italy LIESMARS Wuhan UniversityWuhan 430079China School of Electronic Information Wuhan UniversityWuhan 430072China

This paper is intended to report on the progresses made during the Dragon-4 project Three and Four-Dimensional Topographic Measurement and Validation(ID:32278),sub-project Multi-baseline SAR Processing for 3 D/4 D Reconstruction(ID:322782).The work here reported focuses on two important aspects of SAR remote sensing of tropical forests,namely the retrieval of forest biomass and the assessment of effects due to changing weather *** studies have shown that by using SAR tomography the backscattered power at 30 m layer above the ground is linearly correlated to the forest Above Ground Biomass(AGB).However,the two parameters that determine this linear relationship might vary for different tropical forest *** purpose of solving this problem,we investigate the possibility of using Li DAR derived AGB to help training the two *** results obtained by processing data from the Tropi SAR campaign support the feasibility of the proposed *** analysis is complemented by an assessment of the impact of changing weather conditions on tomographic imaging,for which we simulate BIOMASS repeat pass tomography using ground-based Tropi SCAT data with a revisit time of 3 days and rainy days *** resulting backscattered power variation at 30 m is within 1.5 d *** this forest site,this error is translated into an AGB error of about 50~80 t/hm^(2),which is 20%or less of forest AGB.

关键词： tropical forest biomass SAR tomography Li DAR temporal decorrelation

Assessment of spatial and temporal dynamics of tropical forest cover： A case study in Malkangiri district of Orissa, India

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Journal of Geographical Sciences 2011年第1期21卷 176-192页

作者： CHIRANJIBI Pattanaik C. SUDHAKAR Reddy P. MANIKYA Reddy Salim Ali Centre for Ornithology & Natural History Deccan Regional Station 12-13-588/B Nagarjuna Nagar Colony Tarnaka Hyderabad 500017 Andhra Pradesh India forestry & Ecology Division National Remote Sensing Centre Hyderabad 500625 Andhra Pradesh India Department of Botany Osmania University Hyderabad 500007 Andhra Pradesh India

tropical forests have been recognized as having global conservation importance. However,they are being rapidly destroyed in many regions of the world. Regular monitoring of forests is necessary for an adaptive management approach and the successful implementation of ecosystem management. The present study analyses the temporal changes in forest ecosystem structure in tribal dominated Malkangiri district of Orissa,India,during 1973-2004 period based on digitized forest cover maps using geographic information system （GIS） and interpretation of satellite data. Three satellite images Landsat MSS （1973）,Landsat TM （1990） and IRS P6 LISS III （2004） were used to determine changes. Six land cover types were delineated which includes dense forest,open forest,scrub land,agriculture,barren land and water body. Different forest types were also demarcated within forest class for better understanding the degradation pattern in each forest types. The results showed that there was a net decrease of 475.7 km2 forest cover （rate of deforestation = 2.34） from 1973 to 1990 and 402.3 km2 （rate of deforestation = 2.27） from 1990 to 2004. forest cover has changed over time depending on a few factors such as large-scale deforestation,shifting cultivation,dam and road construction,unregulated management actions,and social pressure. A significant increase of 1222.8 km2 agriculture area （1973-2004） clearly indicated the conversion of forest cover to agricultural land. These alterations had resulted in significant environmental consequences,including decline in forest cover,soil erosion,and loss of biodiversity. There is an urgent need for rational management of the remaining forest for it to be able to survive beyond next decades. Particular attention must be paid to tropical forests,which are rapidly being deforested.

关键词： deforestation forest dynamics GIS remote sensing tropical forest Malkangiri,Orissa

Leaf traits from stomata to morphology are associated with climatic and edaphic variables for dominant tropical forest evergreen oaks

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Journal of Plant Ecology 2021年第6期14卷 1115-1127页

作者： Yutong Lin Luhui Kuang Songbo Tang Zhijian Mou Oliver LPhillips Hans Lambers Zhanfeng Liu Jordi Sardans Josep Penelas Yuan Lai Mingxian Lin Dexiang Chen Yuanwen Kuang Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical GardenChinese Academy of SciencesGuangzhou 510650China Heshan National Field Research Station of forest Ecosystem South China Botanical GardenGuangzhou 510650China Guangdong Provincial Key Laboratory of Applied Botany South China Botanical GardenGuangzhou 510650China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China School of Geography University of LeedsLeeds LS29JTUK School of Biological Sciences University of Western AustraliaPerthWA 6009Australia CSIC Global Ecology Unit CREAF-CEAB-UABCerdanyola del Valles08193 CataloniaSpain CREAF Bellaterra08193 CataloniaSpain Research Institute of tropical forestry Chinese Academy of ForestryGuangzhou 510520China

Aims Understanding variation and coordination of leaf traits at multiscales along elevational gradients can help predict the likely responses of dominant species to climate *** seek to determine the extent to which variation in leaf stomatal,anatomical and morphological traits is associated with environmental factors,and whether ecological strategies of Cyclobalanopsis species shift with *** In a tropical forest landscape in Jianfengling,South China,we determined leaf traits related to stomata,anatomy and morphology of six evergreen oak species(Cyclobalanopsis bambusaefolia,***,***,***,*** and ***)along a long elevational gradient(400–1400 m above sea level).Important Findings We found that stomatal density and stomatal pore index increased,whereas spongy mesophyll thickness to leaf thickness ratios decreased,significantly with *** leaf area and leaf dry matter content increased and decreased,respectively,with *** in stomatal,anatomical and morphological traits were mainly correlated to the mean annual temperature,mean annual sum precipitation and soil *** low and high elevations,the oak species exhibited strong stress tolerance combined with competition strategy,while they shifted toward more clearly the competitive strategy at intermediate *** the changes in soil phosphorus concentration and soil pH along the elevation may drive the shift of ecological *** results showed that the dominant oak species in tropical forests respond to environmental change by modulating traits at multiple levels,from that of the individual cell,through tissue and up to the whole leaf scale.

关键词： elevational gradient ecological strategy leaf traits oak species tropical forest

Evolution of Floristic Composition and Structural Parameters between Two Management Inventories in a tropical forest in the East Cameroon Region

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Open Journal of forestry 2023年第3期13卷 243-261页

作者： Aichetou Ngoungoure Manjeli Fridolin Choula Kadiri Serge Bobo Achille Bernard Biwole Mireille Feudjio Department of forestry Faculty of Agronomy and agronomical Sciences University of Dschang Dschang Cameroon Department of Biology Higher Teacher Training College The University of Bamenda Bambili Cameroon Department of forestry Higher Teacher Technical Training College The University of Douala Douala Cameroon

The realization of two management inventories in 2003 and 2020 on the same forest concession made it possible to characterize the floristic composition and to describe some structural parameters on three sites established according to the period of exploitation. Due to the change in the orientation of the lines, it was noted that respectively 82 and 85 species from the first inventory are not found in the second and inversely. A total of 311 species were identified in 2003, compared to 314 in 2020. The density varies from 111 to 140 stems/ha for all the individuals, 19 to 25 for the main species and 15 to 20 for the most exploited species. The decrease in the basal area between the two phases of 12% for all the species and 13% for the main species on the site exploited before the first inventory indicates a persistence of the disturbance for years after logging. It is proposed to supplement the management plans decisions with annual measures based on more complete inventories and to ensure the application of reduced impact logging measures.

关键词： tropical forest Floristic Composition Density Basal Area

Response of understory plant diversity to long-term nitrogen and phosphorus additions in a tropical forest

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Response of understory plant diversity to long-term nitrogen...

Seedling dynamics differ between canopy species and understory species in a tropical seasonal rainforest,SW China

中国植物学会第十六次全国会员代表大会暨85周年学术年会

作者： Qinggong Mao Xiankai Lu Jiangming Mo Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems and Guangdong Provincial Key Laboratory of Applied Botany South China Botanical GardenChinese Academy of Sciences

Nitrogen（N） and phosphorus（P） are the most important mineral nutrients for *** evidence suggests N and P supply,either by elevating anthropogenic inputs or along natural gradient,can shape assemblage of plant species in terrestrial ***,it remains unclear how N and P enrichment and their interaction affect species diversity in tropical forests,where N is abundance but P is relatively *** address this question,we performed a factorial N and P addition experiment in an old-growth tropical forest of southern *** showed that 9 years of N addition and P addition significantly decreased understory plant diversity in this N-rich forest,and there were no interactions between N and P additions on plant *** further found that N addition-induced decrease in diversity was primarily attributed to soil acidification,while P addition-induced decrease was mainly caused by energetic imbalance,showing increases in belowground C invest without the increase in aboveground C *** results suggest that both increases in N deposition and P availability could affect plant diversity in N-rich tropical forests,and controls in N emission and deposition become urgent to protect forest biodiversity with elevating N deposition in the tropics.

关键词： phosphorus enrichment nitrogen deposition plant diversity tropical forest southern China

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Plant Diversity 2024年第5期46卷 671-677页

作者： Libing Pan Xiaoyang Song Wenfu Zhang Jie Yang Min Cao CAS Key Laboratory of tropical forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglunMengla 666303YunnanChina College of Life Sciences University of Chinese Academy of SciencesBeijing 100049China

We used 11 years of census data from 450 seedling quadrats established in a 20-ha forest dynamics plot to study seedling dynamics in tree species of a tropical seasonal rainforest in Xishuangbanna,southwestern *** found that overall seedling recruitment rate and relative growth rate were higher in the rainy season than in the dry *** the recruitment rate of seedlings from canopy tree species(two species)and the relative growth rate of seedlings from understory species(nine species)were higher in the rainy season than in the dry ***,in the rainy season,the recruitment rate of seedlings was higher for canopy tree species than for understory tree *** addition,relative growth rate of seedlings was higher in the canopy species than in understory seedlings in the dry *** also observed that,in both rainy and dry seasons,mortality rate of seedlings was higher for canopy species than for understory ***,canopy tree species appear to have evolved a flexible strategy to adapt to the seasonal changes of a monsoon *** contrast,understory tree species seem to have adopted a conservative ***,these species mainly release seedlings in the rainy season and maintain relatively stable populations with a lower mortality rate and recruitment rate in both dry and rainy *** study suggests that canopy and understory seedling populations growing in forest understory may respond to future climate change scenarios with distinct regeneration strategies.

关键词： tropical forest Tree seedling Seasonality Recruitment Mortality Relative growth rate