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Activity-density and spatial distribution of termites on a fine-scale in a tropical rainforest in Xishuangbanna,southwest China

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Soil Ecology Letters 2023年第1期5卷 169-180页

作者： Myo Thant Xiaobing Lin Anjana JAtapattu Min Cao Shang-wen Xia Shengjie Liu Xiaodong Yang CAS Key Laboratory of tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesXishuangbanna 666303China University of Chinese Academy of Sciences Beijing 100049China Forest Department Ministry of Natural Resources and Environmental ConservationNay Pyi TawMyanmar Jiangxi Institute of Red Soil Nanchang 331717China Agronomy Division Coconut Research InstituteLunuwila 61150Sri Lanka State Key Laboratory of Biocontrol School of Life Sciences and School of EcologySun Yat-sen UniversityGuangzhou 510275China

The community composition and activity-density of termites can influence nutrient cycling and other ecological ***,the spatial distribution and the activity-density of termites on a fine-scale in tropical forests are still *** checked the spatial distribution patterns of the feeding groups and species of termites and their co-occurrence pattern in a 1-ha(100 m×100 m)plot,and their correlatiion with the environmental *** used a standard protocol to collect termite assemblages and classified them into five feeding groups based on their preferrred diet:fungus growers,litter feeders,soil feeders,soil-wood feeders,and wood *** measured the environmental factors:soil pH,litter mass,aboveground plant biomass,and topographic position index(TPI).Soil-wood feeders showed the highest activity-density,followed by wood feeders,fungus growers,soil feeders,and litter ***-wood feeders and fungus growers demonstated a strong correlation while litter feeders showed weak correlations with other feeding *** feeding groups and most of the termite species displayed a positive association with the high TPI and the low soil pH *** results indicated that the examined environmental factors influenced the termite community assemblages and distribution patterns on a fine-scale in tropical rainforests.

关键词： Competition Co-occurrence Feeding groups Fine-scale Spatial distribution tropical rainforest

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Observational study of the physical and chemical characteristics of the winter radiation fog in the tropical rainforest in Xishuangbanna, China

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Science China Earth Sciences 2021年第11期64卷 1982-1995页

作者： Yuan WANG Shengjie NIU Chunsong LU Jingjing LV Jing ZHANG Hongwei ZHANG Sirui ZHANG Naifu SHAO Wei SUN Yuchen JIN Qinghai SONG Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters and Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological AdministrationNanjing University of Information Science&Technology(NUIST)Nanjing 210044China College of Safety Science and Engineering Nanjing Tech UniversityNanjing 210009China Key Laboratory of tropical Forest Ecology(TFE) Xishuangbanna Tropical Botanical GardenChinese Academy of Sciences(CAS)Menglun 666303China Henan Meteorological Observation and Data Center Zhengzhou 450003China

We conducted a three-month field experiment focusing on the physical and chemical characteristics of fog in a tropical rainforest in Xishuangbanna,Southwest China,in the winter of *** general,the fog would form at midnight and persist because of the increased long-wave radiative cooling combined with the high relative humidity,gentle breeze,and a relatively low aerosol number concentration in the forest;the fog would dissipate before noon due to the increasing turbulence near the *** diurnal cycle is typical for radiation *** microphysical fog properties included a relatively low number concentration of the fog droplet,large droplet size,high liquid water content,narrow droplet number-size distribution,and high *** chemical properties showed that the fog water was slightly alkaline with low electrical conductivity,whereas the highest proportions of anions and cations therein were Cl^(−)and Ca^(2+),respectively;the chemical components were enriched in small fog *** addition,we indirectly calculated the fog supersaturation according to theκ-Köhler *** found that condensation broadens the droplet number-size distribution at relatively low supersaturation,which is positively correlated with the fog-droplet number concentration and negatively correlated with the droplet mean-volume diameter;this affects the key microphysical processes of fog.

关键词： Radiation fog Formation and disappearance mechanisms Physical and chemical characteristics Supersaturation tropical rainforest

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Climate and land-use interactively shape butterfly diversity in tropical rainforest and savanna ecosystems of southwestern China

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Insect Science 2021年第4期28卷 1109-1120页

作者： Bai-Ge Miao Yan-Qiong Peng Da-Rong Yang Yasuhiro Kubota Evan P.Economo Cong Liu CAS Key Laboratory of tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglaYunnanChina Plant Ecology Core Botanical GardensChinese Academy of SciencesMenglaYunnanChina Faculty of Science University of the RyukyusNishiharaOkinawaJapan Biodiversity and Biocomplexity Unit Okinawa Institute of Science and Technology Graduate UniversityOnna-sonOkinawaJapan Department of Organismic and Evolutionary Biology Museum of Comparative ZoologyHarvard UniversityCambridgeMAUnited States

Human-induced habitat conversion and degradation,along with accelerating climatic change,have resulted in considerable global biodiversity ***,how local ecological assemblages respond to the interplay between climate and land-use change remains poorly ***,we examined the effects of climate and land-use interactions on butterfly diversity in different ecosystems of southwestern ***,we investigated variation in the alpha and beta diversities of butterflies in different landscapes along human-modified and climate *** found that increasing land-use intensity not only caused a dramatic decrease in butterfly alpha diversity but also significantly simplified butterfly species composition in tropical rainforest and savanna *** findings suggest that habitat modification by agricultural activities increases the importance of deterministic processes and leads to biotic *** land-use intensity model best explained species richness variation in the tropical rainforest,whereas the climate and land-use intensity interaction model best explained species richness variation in the *** results indicate that climate modulates the effects of land-use intensity on butterfly alpha diversity in the savanna *** also found that the response of species composition to climate varied between sites:specifically,species composition was strongly correlated with climatic distance in the tropical rainforest but not in the *** together,our long-term butterfly monitoring data reveal that interactions between human-modified habitat change and climate change have shaped butterfly diversity in tropical rainforest and *** findings also have important implications for biodiversity conservation under the current era of rapid human-induced habitat loss and climate change.

关键词： butterfly diversity climate change conservation habitat conversion savanna tropical rainforest

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Lipid concentration and composition in xylem sap of woody angiosperms from a tropical savanna and a seasonal rainforest

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Plant Diversity 2024年第1期46卷 126-133页

作者： Ling-Bo Huang Xinyi Guan Amy Ny Aina Aritsara Jun-Jie Zhu Steven Jansen Kun-Fang Cao State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources Guangxi Key Laboratory of Forest Ecology and ConservationGuangxi UniversityDaxuedong Road 100NanningGuangxi 530004China Institute of Botany Ulm UniversityAlbert-Einstein-Allee 11Ulm89081Germany

Lipids may play an important role in preventing gas embolisms by coating nanobubbles in xylem *** studies on xylem sap lipids have been reported for temperate plants,and it remain unclear whether sap lipids have adaptational significance in tropical *** this study,we quantify the lipid composition of xylem sap for angiosperm species from a tropical savanna(seven species)and a seasonal rainforest(five species)using mass *** found that all twelve species studied contained lipids in their xylem sap,including galactolipids,phospholipids and triacylglycerol,with a total lipid concentration ranging from 0.09 to 0.26 nmol/*** was no difference in lipid concentration or composition between plants from the two sites,and the lipid concentration was negatively related to species’open vessel ***,savanna species showed little variation in lipid composition between the dry and the rainy *** results support the hypothesis that xylem sap lipids are derived from the cytoplasm of individual conduit cells,remain trapped inside individual conduits,and undergo few changes in composition over consecutive seasons.A xylem sap lipidomic data set,which includes 12 tropical tree species from this study and 11 temperate tree species from literature,revealed no phylogenetic signals in lipid composition for these *** study fills a knowledge gap in the lipid content of xylem sap in tropical trees and provides additional support for their common distribution in xylem sap of woody *** appears that xylem sap lipids have no adaptive significance.

关键词： Xylem sap Lipids tropical savanna tropical rainforest Vessels

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Buttress trees in a 20-hectare tropical dipterocarp rainforest in Xishuangbanna, SW China

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Journal of Plant Ecology 2013年第2期6卷 187-192页

作者： Zhiyuan He Yong Tang Xiaobao Deng Min Cao Key Laboratory of tropical Forest Ecology Xishuangbanna Tropical Botanical Gardenthe Chinese Academy of SciencesMengla 666303China University of Chinese Academy of Sciences Beijing 100049China

Aims buttresses are prevalent and are important to many ecological processes in tropical rainforests but are overlooked in many rainforest *** on a buttress survey in a 20-hectare plot,this study aims to answer the following questions:(i)is buttress forming a fixed species characteristic?(ii)is there any phylogenetic signal for buttress forming across a broad taxonomic scale?(iii)is buttress form-ing an inherent feature or simply induced by environmental factors,and how is this relevant to the size of the tree?Methods We surveyed buttresses for all 95940 trees with diameter at breast height(DbH)≥10 mm in a 20-ha tropical dipterocarp rainforest in Xishuangbanna,sW *** occurrence of buttresses was compared across different taxa and across different tree-size classes.a phylogenetic analysis was conducted among buttressed and non-buttressed species in order to understand the evolutionary background of buttress *** Findings This preliminary study showed that buttress trees are very abundant(making up 32%of trees with≥100 mm DbH)in this 20-ha tropical rainforest situated at the northern edge of the ***-one percent of the 468 tree species in the plot had stems that produced *** trees were more likely to develop buttresses than smaller *** found that although buttress formation is not a fixed species characteristic,there is a strong phylogenetic signal for buttress formation in larger species.

关键词： buttress phylogenetic signal tropical rainforest species size Xishuangbanna

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A test of the mycorrhizal-associated nutrient economy framework in two types of tropical rainforests under nutrient enrichments

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Forest Ecosystems 2023年第1期10卷 12-20页

作者： Qingshui Yu Suhui Ma Xiaofeng Ni Lai Jiang Zhang Zhou Jiangling Zhu Chengjun Ji Zhiyao Tang Xiaoli Cheng Jingyun Fang Institute of Ecology College of Urban and Environmental SciencesKey Laboratory for Earth Surface Processes of the Ministry of EducationPeking UniversityBeijing100871China Research Institute of tropical Forestry Chinese Academy of ForestryGuangzhou 510520China Key Laboratory of Soil Ecology and Health in Universities of Yunnan Province School of Ecology and Environmental ScienceYunnan UniversityKunming650091China

Shifts in tree species and their mycorrhizal associations driven by global change play key roles in biogeochemical cycles. In this paper, we proposed a framework of the mycorrhizal-associated nutrient economy(MANE), and tested it using nutrient addition experiments conducted in two tropical rainforests. We selected two tropical rainforests dominated by arbuscular mycorrhizal(AM) and ectomycorrhizal(ECM) trees, and established eighteen20 m×20 m plots in each rainforest. Six nitrogen(N) and phosphorus(P) addition treatments were randomly distributed in each rainforest with three replicates. We examined the differences in soil carbon(C) and nutrient cycling, plant and litter productivity between the two rainforests and their responses to 10-year inorganic N and P additions. We also quantified the P pools of plants, roots, litter, soil and microbes in the two rainforests. Overall,distinct MANE frameworks were applicable for tropical rainforests, in which soil C, N and P were cycled primarily in an inorganic form in the AM-dominated rainforest, whereas they were cycled in an organic form in the ECMdominated rainforest. Notably, the effects of mycorrhizal types on soil P cycling were stronger than those on C and N cycling. The intensified N and P deposition benefited the growth of AM-dominated rainforests instead of ECMdominated rainforests. Our findings underpin the key role of mycorrhizal types in regulating biogeochemical processes, and have important implications for predicting the ecological consequences of global changes.

关键词： Nutrient cycling Nutrient addition Mycorrhizal association Arbuscular mycorrhiza Ectomycorrhiza tropical rainforest

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Responses of soil CH_(4) fluxes to nitrogen addition in two tropical montane rainforests in southern China

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Forest Ecosystems 2022年第3期9卷 335-343页

作者： Fangtao Wu Changhui Peng Chuanyao Wang Huai Chen Weiguo Liu Zhihao Liu Hui Wang Hong Li Dexiang Chen Yide Li Shirong Liu Center for Ecological Forecasting and Global Change College of ForestryNorthwest Agriculture and Forestry UniversityYangling712100China State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau College of ForestryNorthwest Agriculture and Forestry UniversityYangling712100China Department of Biology Sciences Institute of Environment SciencesUniversity of Quebec at MontrealC.P.8888Succ.Centre-VilleMontrealQCH3C 3P8Canada Chengdu Institute of Biology Chinese Academy of SciencesChengdu610041China School of Architecture and Urban Planning Chongqing UniversityChongqing400044China Jianfengling National Key Field Observation and Research Station for Forest Ecosystem Research Institute of Tropical ForestryChinese Academy of ForestryGuangzhou510520China Research Institute of Forest Ecology Environment and ProtectionChinese Academy of ForestryBeijing100091China

Background:Atmospheric nitrogen(N)deposition is projected to increase in the next few decades,which may have a marked impact on soil-atmosphere CH_(4) ***,the impacts of increased atmospheric N depositions on soil CH_(4) flux in tropical rainforests are still poorly *** January 2015 to December 2018,a field experiment was conducted in a primary tropical montane rainforest(PTMR)and a secondary tropical montane rainforest(STMR)in southern China to quantify the impact of N additions at four levels(N0:0 kg N⋅ha^(-1)⋅year^(-1);N25:25 kg N⋅ha^(-1)⋅year^(-1);N50:50 kg N⋅ha^(-1)⋅year^(-1);N100:100 kg N⋅ha^(-1)⋅year^(-1)on soil CH_(4) ***:Four years of measurements showed clear seasonal variations in CH_(4) flux in all treatment plots for both forest types(PTMR and STMR),with lower rates of soil CH_(4) uptake during the wet season and higher rates of soil CH_(4) uptake during the dry *** CH_(4) uptake rates were significantly and negatively correlated with both soil temperature and soil moisture for both forest *** CH_(4) uptake for the N0 plots from the PTMR and STMR soils were2.20 and1.98 kg N⋅ha^(-1)⋅year^(-1),*** the PTMR site,mean CH_(4) uptake compared with the N0 treatment was reduced by 19%,29%,and 36%for the N25,N50,and N100 treatments,*** the STMR site,mean CH_(4) uptake compared with the N0 treatment was reduced by 15%,18%,and 38%for the N25,N50,and N100 treatments,*** level N addition had a stronger inhibitory impact on soil CH_(4) uptake than did the low level N ***:Our data suggest that soil CH_(4) uptake in tropical rainforests is sensitive to N *** atmospheric N deposition continues to increase in the future,the soil CH_(4) sink strength of tropical rainforests may weaken further.

关键词： Atmospheric nitrogen deposition Greenhouse gases Soil CH_(4)flux tropical rainforest

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Phyllosphere eukaryotic microalgal communities in rainforests:Drivers and diversity

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Plant Diversity 2023年第1期45卷 45-53页

作者： Ben-Wen Liu Shu-Yin Li Huan Zhu Guo-Xiang Liu Key Laboratory of Algal Biology Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China Yangtze River Basin Ecological Environment Monitoring and Scientific Research Center Yangtze River Basin Ecological Environment Supervision and Administration BureauMinistry of Ecological EnvironmentWuhan 430072China

Phyllosphere algae are common in tropical rainforests,forming visible biofilms or spots on plant leaf ***,knowledge of phyllosphere algal diversity and the environmental factors that drive that diversity is *** aim of this study is to identify the environmental factors that drive phyllosphere algal community composition and diversity in *** this purpose,we used single molecule real-time sequencing of full-length 18S rDNA to characterize the composition of phyllosphere microalgal communities growing on four host tree species(Ficus tikoua,Caryota mitis,Arenga pinnata,and Musa acuminata) common to three types of forest over four months at the Xishuangbanna tropical Botanical Garden,Yunnan Province,*** 18S rDNA sequences revealed that the green algae orders Watanabeales and Trentepohliales were dominant in almost all algal communities and that phyllosphere algal species richness and biomass were lower in planted forest than in primeval and reserve *** addition,algal community composition differed significantly between planted forest and primeval *** also found that algal communities were affected by soluble reactive phosphorous,total nitrogen,and ammonium *** findings indicate that algal community structure is significantly related to forest type and host tree ***,this study is the first to identify environmental factors that affect phyllosphere algal communities,significantly contributing to future taxonomic research,especially for the green algae orders Watanabeales and *** research also serves as an important reference for molecular diversity analysis of algae in other specific habitats,such as epiphytic algae and soil algae.

关键词： Full-length 18S rDNA sequences Cryptic diversity Environmental factors High-throughput sequence Phyllosphere algae tropical rainforest

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Synergetic effects of photo-oxidation and biodegradation on failure behavior of polyester coating in tropical rain forest atmosphere

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Journal of Materials Science & Technology 2021年第5期64卷 195-202页

作者： Lin Lu Qianqian Liu Corrosion and Protection Center University of Science and Technology BeijingBeijing100083China State Key Laboratory of Metal Material for Marine Equipment and Application Anshan114000China

This work aimed to study the comprehensive effects of photo-oxidation and biodegradation on different failure stages of polyester coatings,which were exposed to the tropical rainforest *** surface morphology,aging products,local aging characteristics and electrochemical behavior of the coatings were characterized with scanning electron microscope(SEM),fourier transform infrared spectroscopy(FTIR),electrochemical impedance spectroscopy(EIS)and high-resolution dispersive Raman *** results showed that the surface of coatings became rougher and fungal hyphae distributed more densely on surface with the increasing of exposure *** the aspect of polymer structure,the ultraviolet radiation destroyed the main chain of polyester through the photo-oxidation process,resulting in the breakage of aliphatic ester bonds and the formation of ***,the metabolites of fungi can promote the hydrolysis of oligomers produced by the *** a short,the photo-oxidation could facilitate the biodegradation of the *** the synergistic effect of UV photo-oxidation and fungal biodegradation,a rapid diffusion tunnel between the coating surface and the metal substrate was established at the pore defects of the coating,which finally accelerated the corrosion failure process of the *** main corrosion products includeα-Fe_(2)O_(3),ZnO and Zn_(5)(OH)_(6)(CO_(3))_(2).

关键词： Polyester coating Fungus Biodegradation Photo-oxidation Microbiologically influenced corrosion tropical rainforest

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Population distribution and threats to sustainable management of selected non-timber forest products in tropical lowland rainforests of south western Nigeria

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Journal of Forestry Research 2013年第1期24卷 75-82页

作者： Jimoh S.O. Amusa T.O. I.O. Azeez Department of Forest Resources Management University of IbadanNigeria. Department of Forest Resources Management University of IlorinNigeria.

Uncontrolled harvesting of non-timber forest products （NTFPs） poses a serious risk of extermination to several of these species in Nigeria. Yet, there is a paucity of information on the distribution, population status and sustainable management of NTFPs in most of the tropical lowland rainforests. We, therefore, assessed the population, distribution and threats to sustainable management of NTFPs within the tropical lowland rainforests of Omo and Shasha Forest Reserves, south western Nigeria. Data were obtained through inventory surveys on five top priority species including： bush mango （Irvingia gabonensis （Aubry-Lecomte ex O’Rorke） Baill）, African walnut （Tetracarpidium conophorum （Mull. Arg.） Hutch. ＆ Dalziel syn. Plukenetia conophora）, chew-stick （Massularia acuminata （G. Don） Bullock）, fever bark （Annickia chlorantha Setten ＆ *** syn. Enantia chloranta） and bush pepper （Piper guineense Schumach. ＆ Thonn.）. Purposive and stratified random sampling techniques were used for the inventory. Each forest reserve was stratified into three, viz： less disturbed natural forest （for areas that have been rested for at least ten years）, recently disturbed natural forest （for areas that have suffered one form of human perturbation or the other in the last five years）, and plantation forest （for areas carrying forest plantation）. Data were collected from eighteen 10 m × 500 m belt transects located in the above strata. The species were generally fewer in both plantation and recently disturbed natural forest than the less disturbed natural forest, suggesting that forest disturbances （habitat modification） for other uses may have an effect on the occurrence and densities of the NTFPs. Exceptions to this trend were found for P. guineense and T. conophorum, which were fairly common in both plantation and recently disturbed natural forest. Among three tree NTFP species （i.e. I. gabonensis, M. acuminata and A. chlorantha）, only I. gabonensis showed a significant difference in ov

关键词： tropical rainforest non-timber forest products (NTFP) population density distribution forest management

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