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Spatial characteristics of the stability of mangrove ecosystems in freshwater and seawater floods in Southeast Asia

Journal of Geographical Sciences 2022年第9期32卷 1831-1846页

作者： LI Xia LIU Zhenhai WANG Shaoqiang LI Fengting LI Hui ZHU Tongtong QIAN Zhaohui TU Yongkai LIU Yuanyuan WANG Xiaobo WANG Qinyi SHI Weibo LI Donghui College of Environmental Science and Engineering Tongji UniversityShanghai200092China Foreign Environmental Cooperation Center Ministry of Ecology and EnvironmentBeijing100035China Key Laboratory of Regional Ecology and Environmental Change School of Geography and Information EngineeringChina University of GeosciencesWuhan430074China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan430074China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchCASBeijing100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing100049China

In tropical regions,mangrove forests are located in the inter-tidal areas between land and sea,and are at risk from both freshwater and seawater *** satellite-derived Normalized Difference Vegetation Index(NDVI)products,this study compared the differences in resistance and resilience of mangrove ecosystems to freshwater and seawater floods in Southeast Asia,and analyzed the spatial characteristics of the stability of mangrove ecosystems under floods in representative *** show that mangroves tended to have lower mean resistance(28.24 vs.37.32)and higher mean resilience(3.74 vs.3.56)under freshwater floods,compared to seawater *** resistance increased with the distance from rivers,such that the resistance of coastal areas to freshwater and seawater floods was lower than that of inland *** areas with lower resistance showed higher resilience compared to those with higher *** mangroves hardly fully recovered to their normal NDVI levels one year after seawater floods,especially in coastal *** the occurrence of seawater floods was relatively rare in the past,it is likely to increase under more-intense climate extremes in the future,and the threat to the survival of mangroves may also ***,it is essential to evaluate the stability of mangrove ecosystems under floods.

关键词： mangrove flood ecosystem stability resistance resilience Southeast Asia

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Species turnover drives grassland community to phylogenetic clustering over long-term grazing disturbance

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Journal of Plant Ecology 2020年第2期13卷 157-164页

作者： Juntao Zhu Yangjian Zhang Wenfeng Wang Xian Yang Ning Chen Ruonan Shen Li Wang Lin Jiang Lhasa Plateau Ecosystem Research Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China School of Biological Sciences Georgia Institute of TechnologyAtlantaGA 30332USA CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100190China Tibet Academy of Agricultural and Animal Husbandry Science Lhasa 850032China Shenzhen Graduate School Peking UniversityShenzhen 518000China

Aims Grazing exerts profound effects on grassland ecosystem service and functions by regulating species composition and diversity,and structuring community assembly ***,adaptions of phylogenetic diversity and phylogenetic community structure to long-term grazing disturbance remain poorly studied,especially for ecosystems distributed in extreme *** Here,we conducted an experiment with multigrazing intensities to explore the impacts of grazing disturbance on plant phylogenetic diversity and community structure in an alpine grassland of the Tibetan *** Findings Grazing disturbance enriched plant species richness(SR),and stimulated species turnover from regional species pool,consequently changing community species *** low intensities,grazing exerted no obvious effects on phylogenetic diversity and community structure,whereas communities changed from overdispersion to clustering under high grazing *** grazing intensity resulted in stronger environmental filtering,which consequently selected those species with high resilience to grazing *** observed clustering structure was associated with the colonizing species which were closely related to resident species,and locally extinct species,and distantly related to *** the plant functional trait level,high grazing intensity increased species colonization largely by altering the effect of root depth on species colonization compared to light *** results highlight that solely utilization of SR and diversity cannot fully represent grassland communities responses to *** effects of species turnover on community phylogenetic diversity and structure are entailed to be explored in the future grazing studies.

关键词： alpine grassland grazing phylogenetic diversity phylogenetic community structure species richness

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Determining whether Qinghai–Tibet Plateau waterbodies have acted like carbon sinks or sources over the past 20 years

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Science Bulletin 2022年第22期67卷 2345-2357页

作者： Junjie Jia Kun Sun Sidan Lü Mingxu Li Yafeng Wang Guirui Yu Yang Gao Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Alpine Ecology Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China

Half of all of China’s lakes are on the Qinghai–Tibet Plateau(QTP),which are mainly distributed at altitudes above 4000 m *** under conditions of progressively intensifying anthropogenic activities and climate change,the debate on whether QTP lakes act as carbon(C)sinks or sources remains *** study explores QTP lake C exchange processes and characteristics over the past two decades through field monitoring and data *** reveal high lake carbon dioxide(CO_(2))exchange flux distribution patterns in its western and southern regions and correspondingly low values in its eastern and northern *** CO_(2)exchange flux rates also show significant temporal differences where those in the 2000s and 2010s were significantly higher compared to the *** total CO_(2)emission flux from QTP lakes has increased from 1.60 Tg Ca^(-1)in the 2000s to 6.87 Tg Ca^(-1)in the 2010s before decreasing to 1.16 Tg Ca^(-1)in the ***,QTP lakes have generally acted as C sinks when annual ice-cover periods are included in the estimation of annual C ***,QTP lakes are gradually evolving towards C *** small-sized freshwater lakes on the QTP exhibit C sequestration characteristics while low-mid altitude saltwater lakes also act as C ***,owing to the high uncertainties in the estimation of C exchange flux,the QTP lake C sink capacity has been largely underestimated.

关键词： Carbon budget Carbon cycle Carbon exchange flux Global climate change Carbon emissions

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REE characteristic and significance of DongChuan red clay resource in Kunming, China 4

REE characteristic and significance of DongChuan red clay re...

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4th Academic Conference of Geology Resource Management and Sustainable Development

作者： Di, Yingwei Cong, Diange Feng, Yunfei Institute of Earth Sciences China University of Geosciences Beijing100083 China Depratment of Geological Engineering Qinghai University Xining810016 China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Beijing100101 China University of Chinese Academy of Sciences Beijing100049 China

ISBN: (纸本)9781921712494

The southern red clay is the most extensively developed and utilized red clay resourse at present. Many mineral resources such as lateritic nickel ore, lateritic gold deposit and lateritic bauxite are stored in such red clay. The research efforts in this area focus on the distribution, provenance, cause of formation, stratigraphic age and the development level of the red earth, and the research findings will surely benefit the development and utilization of the red clay resourse. This study analysed the contents of REE, the rare earth elements' distribution patterns and characteristic parameters and characteristic values of the red clay in Dongchuan area. The results show that the main sendimentary source of the Dongchuan RH profile may be the purple-red sandstone, the red clay may have experienced strong weathering during its formation and appears the characteristics of ferrallitic-rich weathering crust which represents a warm and humid climate and environment, all of which meet the necessary conditions of the formation of the lateritic bauxite resources.

关键词： Gold deposits

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AN IN SITU STAINING METHOD FOR DETERMINING RADIAL VARIATION OF XYLEM SAP FLOW OF DIFFERENT TREE SPECIES IN SUBTROPICAL CHINA

AN IN SITU STAINING METHOD FOR DETERMINING RADIAL VARIATION ...

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2010年亚洲通量网会议(Asiaflux workshop2010)

作者： Fei Xu Huimin Wang Fengting Yang Qianyanzhou Ecological Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina Graduate University of the Chinese Academy of Sciences BeijingChina Qianyanzhou Ecological StationKey Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina

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Cloudy Sky Conditions Promote Net ecosystem CO_2 Exchange in a Subtropical Coniferous Plantation across Seasons

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Journal of Resources and Ecology 2019年第2期10卷 137-146页

作者： HAN Jiayin YE Shu GUO Chuying ZHANG Leiming LI Shenggong WANG Huimin Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academyof Sciences Beijing 100101 China College of Resources and Environment University of Chinese Academy of Sciences Beijing 100190 China

Dynamic changes in solar radiation have an important influence on ecosystem carbon sequestration,but the effects of changes caused by sky conditions on net ecosystem CO2 exchange(NEE)are *** study analyzed the effects of sunny,cloudy,and overcast sky conditions on NEE using carbon flux and meteorological data for a subtropical coniferous plantation in *** on one-year data,we found no seasonal variation in the light response curve under various sky *** with sunny sky conditions,the apparent quantum yield(α)and potential photosynthetic rate at a light intensity of 150 and 750 W m^-2(P150 and P750)under cloudy sky conditions increased by an average of 82.3%,217.7%,and 22.5%;αand P150 under overcast sky conditions increased by 118.5%and 301%on *** radiation conditions were more favorable for maximum NEE,while low radiation conditions inhibited *** most cases,when the sunny NEE was used as a baseline for comparison,the relative change in NEE(%NEE)was positive under cloudy sky conditions and negative under overcast sky *** average maximal%NEE under cloudy sky conditions was 42.4% in spring,34.1% in summer,1.6% in autumn and –87.3% in *** study indicates that cloudy sky conditions promote photosynthetic rates and NEE in subtropical coniferous plantations.

关键词： eddy covariance sky conditions diffuse radiation clearness index NEE

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Coupling Effects of Water and Fertilizer on Growth and Physiological Characteristics of Chinese White Poplar Seedlings

Coupling Effects of Water and Fertilizer on Growth and Physi...

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2013 International Conference on Materials,Architecture and Engineering Technology(ICMAET 2013)

作者： JING QIN WENYI DONG WEI LU China Institute of Water Resources and Hydropower Research Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences

To quantify the coupling effects of soil water content and fertilizer application on the plant stem height（SH）,leaf area（LA）,net photosynthesis rate（PN） and biomass yield（BY） of Populus tomentosa ***,a test was conducted by using a current rotary combination design of quadratic regression of three factors with five levels,and the mathematical regression models and multiple target decision model were *** results showed that all the W,N and P factors had obvious positive effects on plant SH,LA,PN and BY with the size sequence of W > N > *** border effects of three factors had a descending trend with W,N and P *** order to achieve maximum growth potential of *** seedlings,obtain high water and fertilizer use efficiencies and reduce the risk of nitrate pollution of groundwater in arid and semi-arid regions in China,it can be concluded that the combination of W,N and P recommend for growers was W = 78.1%FC,N = 4.48g·plant and P = 1.67 g·plant.

关键词： net Coupling Effects of Water and Fertilizer on Growth and Physiological Characteristics of Chinese White Poplar Seedlings

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Response of Growing Season Gross Primary Production to El Nino in Different Phases of the Pacific Decadal Oscillation over Eastern China Based on Bayesian Model Averaging

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Advances in Atmospheric Sciences 2021年第9期38卷 1580-1595页

作者： Yueyue LI Li DAN Jing PENG Junbang WANG Fuqiang YANG Dongdong GAO Xiujing YANG Qiang YU Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of ScienceBeijing 100049China Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China National Ecosystem Science Data Center Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F UniversityShaanxi 712100China School of Life Sciences University of Technology SydneySydney 2007NSWAustralia

Gross primary production(GPP) plays a crucial part in the carbon cycle of terrestrial ecosystems.A set of validated monthly GPP data from 1957 to 2010 in 0.5°× 0.5° grids of China was weighted from the Multi-scale Terrestrial Model Intercomparison Project using Bayesian model averaging(BMA).The spatial anomalies of detrended BMA GPP during the growing seasons of typical El Nino years indicated that GPP response to El Nino varies with Pacific Decadal Oscillation(PDO) phases: when the PDO was in the cool phase,it was likely that GPP was greater in northern China(32°–38°N,111°–122°E) and less in the Yangtze River valley(28°–32°N,111°–122°E);in contrast,when PDO was in the warm phase,the GPP anomalies were usually reversed in these two *** consistent spatiotemporal pattern and high partial correlation revealed that rainfall dominated this *** previously published findings on how El Nino during different phases of PDO affecting rainfall in eastern China make the statistical relationship between GPP and El Nino in this study theoretically *** paper not only introduces an effective way to use BMA in grids that have mixed plant function types,but also makes it possible to evaluate the carbon cycle in eastern China based on the prediction of El Nino and PDO.

关键词： East China Bayesian model averaging Gross primary production El Nino Pacific Decadal Oscillation Monsoon rainfall

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SIMULATING WATER USE EFFICIENCY OF THE CROPLAND ecosystem IN NORTH CHINA PLAIN

SIMULATING WATER USE EFFICIENCY OF THE CROPLAND ECOSYSTEM IN...

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第三届世界生态高峰会(Eco Summit 2007)

作者： Wang Qiufen Yu Guirui Key Laboratory of Ecosystem Network Observation and Modeling Chinese Academy of Sciences Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China

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Changes of net primary productivity in China during recent 11 years detected using an ecological model driven by MODIS data

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Frontiers of Earth Science 2013年第1期7卷 112-127页

作者： Yibo LIU Weimin JU Honglin HE Shaoqiang WANG Rui SUN Yuandong ZHANG Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology Nanjing University Nanjing 210093 China International Institute for Earth System Science Nanjing University Nanjing 210093 China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China State Key Laboratory of Remote Sensing Science Jointly Sponsored by Beijing Normal University and Institute of Remote Sensing Applications of Chinese Academy of Sciences Beijing 100875 China Key Laboratory of Forest Ecology and Environment State Forestry Administration Institute of Forest Ecology Environment and Protection Chinese Academy of Forestry Beijing 100091 China

Net primary productivity （NPP） is an important component of the terrestrial carbon cycle. Accurately mapping the spatial-temporal variations of NPP in China is crucial for global carbon cycling study. In this study the process-based Boreal ecosystem Productivity Simulator （BEPS） was employed to study the changes of NPP in China＇s ecosystems for the period from 2000 to 2010. The BEPS model was first validated using gross primary productivity （GPP） measured at typical flux sites and forest NPP measured at different regions. Then it was driven with leaf area index （LAI） inversed from the Moderate Resolution Imaging Spectroradiometer （MODIS） reflec- tance and land cover products and meteorological data interpolated from observations at753 national basic meteorological stations to simulate NPP at daily time steps and a spatial resolution of 500m from January 1, 2000 to December 31, 2010. Validations show that BEPS is able to capture the seasonal variations of tower-based GPP and the spatial variability of forest NPP in different regions of China. Estimated national total of annual NPP varied from 2.63 to 2.84Pg ***-1, averaging 2.74Pg ***-1 during the study period. Simulated terrestrial NPP shows spatial patterns decreasing from the east to the west and from the south to the north, in association with land cover types and climate. South-west China makes the largest contribution to the national total of NPP while NPP in the North-west account for only 3.97% of the national total. During the recent 11 years, the temporal changes of NPP were heterogamous. NPP increased in 63.8% of China＇s landmass, mainly in areas north of the Yangtze River and decreased in most areas of southern China, owing to the low temperature freezing in early 2008 and the severe drought in late 2009.

关键词： temporal and spatial variations NPP remotesensing MODIS data BEPS model

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