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Application of subfossil cladocerans(water fleas) in assessing ecological resilience of shallow Yangtze River floodplain lake systems(China)

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Science China Earth Sciences 2018年第9期61卷 1157-1168页

作者： giri kattel Ke ZHANG Xiangdong YANG State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of Sciences Environmental Hydrology and Water Resources Group Department of Infrastructure EngineeringThe University of Melbourne

Majority of shallow floodplain lake ecosystems of the middle and lower reaches of the Yangtze River(China) have gone through serious eutrophication problems over the recent past. The severe environmental deterioration accompanied by cyanobacterial blooms have become major water resource management challenges in the region. An advanced research method is urgently needed to tackle these challenges. The concept of ecological resilience address pressing questions of non-linear dynamics, threshold effects and regime shifts in shallow floodplain lakes, and help manage the ecosystem effectively. Palaeolimnological techniques are important for assessing long term resilience and associated thresholds effects of shallow lake ecosystems. However, the lack of reliable proxy methods available, the assessment of long term ecological resilience of shallow Yangtze River lake systems has become increasingly difficult. Cladocerans(water fleas) play a central role in lacustrine food webs by responding to external drivers and internal ecosystem processes in lakes. Their subfossils are well preserved and becoming one of potential proxy indicators of lake ecosystems change for a longer time scale. This study explores the potential application of subfossil cladocerans and their ephippia in assessing a long term ecological resilience and help better management strategies of lake ecosystems and water resources of the middle and lower reaches of the Yangtze River in China.

关键词： Subfossil cladoceran Yangtze River lake system Food web Ecological resilience Regime shift Threshold

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Pattern changes and early risk warning of Spartina alterniflora invasion:a study of mangrove-dominated wetlands in northeastern Fujian,China

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林业研究:英文版 2023年第5期34卷 1447-1462页

作者： Fangyi Wang Jiacheng Zhang Yan Cao Ren Wang giri kattel Dongjin He Weibin You College of Forestry Fujian Agriculture and Forestry UniversityFuzhou 350002People’s Republic of China South Forest Resources and Environment Engineering Technology Research Center of Fujian Province Fuzhou 350002People’s Republic of China College of Finance Fujian Jiangxia UniversityFuzhou 350002People’s Republic of China Fuding Forestry Bureau Fuzhou 355200People’s Republic of China School of Geographical Sciences Nanjing University of Information Science&TechnologyNanjing 210044People’s Republic of China Department of Infrastructure Engineering University of MelbourneMelbourne 3010Australia Department of Hydraulic Engineering Tsinghua UniversityBeijing 100084People’s Republic of China Fujian Vocational College of Agriculture Fuzhou 350002People’s Republic of China

The exotic saltmarsh cordgrass,Spartina alterniflora(Loisel)Peterson&Saarela,is one of the important causes for the extensive destruction of mangroves in China due to its invasive *** species has rapidly spread wildly across coastal wetlands,challenging resource managers for control of its further *** investigation of *** invasion and associated ecological risk is urgent in China's coastal *** this study,an ecological risk invasive index system was developed based on the Driving Force-Pressure-State-Impact-Response *** were made of'warning degrees':zero warning and light,moderate,strong,and extreme warning,by developing a back propagation(BP)artificial neural network model for coastal wetlands in eastern Fujian *** results suggest that *** mainly has invaded Kandelia candel beaches and farmlands with clustered *** early warning indicator system assessed the ecological risk of the invasion and showed a ladder-like distribution from high to low extending from the urban area in the central inland region with changes spread to adjacent *** of light warning and extreme warning accounted for43%and 7%,respectively,suggesting the BP neural network model is reliable prediction of the ecological risk of *** *** model predicts that distribution pattern of this invasive species will change little in the next 10 ***,the invaded patches will become relatively more concentrated without warning *** suggest that human factors such as land use activities may partially determine changes in warning *** results emphasize that an early warning system for *** invasion in China's eastern coastal wetlands is significant,and comprehensive control measures are needed,particularly for *** beach.

关键词： Early warning system Ecological risk BP neural network model Spartina alterniflora invasion Kandelia candel beaches Fujian China

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Enhanced soil moisture improves vegetation growth in an arid grassland of Inner Mongolia Autonomous Region, China

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Journal of Arid Land 2023年第7期15卷 871-885页

作者： ZHANG Hui giri R kattel WANG Guojie CHUAI Xiaowei ZHANG Yuyang MIAO Lijuan School of Geographical Sciences Nanjing University of Information Science&TechnologyNanjing 210044China State Key Laboratory of Remote Sensing Science Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100094China Department of Infrastructure Engineering the University of MelbourneMelbourne 3010Australia School of Geography&Ocean Science Nanjing UniversityNanjing 210093China

Climate change impacts on grasslands that cover a quarter of the global land area, have become unprecedented during the 21~(st) century. One of the important ecological realms, arid grasslands of northern China, which occupy more than 70% of the region's land area. However, the impact of climate change on vegetation growth in these arid grasslands is not consistent and lacks corresponding quantitative research. In this study, NDVI(normalized difference vegetation index) and climate factors including temperature, precipitation, solar radiation, soil moisture, and meteorological drought were analyzed to explore the determinants of changes in grassland greenness in Inner Mongolia Autonomous Region(northern China) during 1982–2016. The results showed that grasslands in Inner Mongolia witnessed an obvious trend of seasonal greening during the study period. Two prominent climatic factors,precipitation and soil moisture accounted for approximately 33% and 27% of grassland NDVI trends in the region based on multiple linear regression and boosted regression tree methods. This finding highlights the impact of water constraints to vegetation growth in Inner Mongolia's grasslands. The dominant role of precipitation in regulating grassland NDVI trends in Inner Mongolia significantly weakened from 1982 to 1996, and the role of soil moisture strengthened after 1996. Our findings emphasize the enhanced importance of soil moisture in driving vegetation growth in arid grasslands of Inner Mongolia, which should be thoroughly investigated in the future.

关键词： grassland growth normalized difference vegetation index climate change soil moisture Inner Mongolia

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Pattern changes and early risk warning of Spartina alterniflora invasion:a study of mangrove-dominated wetlands in northeastern Fujian,China

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林业研究（英文版） 2023年第5期

作者： Fangyi Wang Jiacheng Zhang Yan Cao Ren Wang giri kattel Dongjin He Weibin You

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Application of Sediment Traps in Global Change Research in Mountain Lakes

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Journal of Mountain Science 2009年第3期6卷 228-239页

作者： G. R. kattel Environmental Change Research Centre (ECRC) Department of GeographyUniversity College London Murray-Darling Freshwater Research Centre Brian Grogan Building La Trobe University

Representativity of biota in the biosphere also have similar significance in the lithosphere after their death. Recently, taphonomic representation of biota in the lithosphere has been widely used for minimizing the biases in palaeo-environmental reconstructions including global climate change. In September 2001, a sediment trap was installed at the central area of the Loch Coire Fionnaraich （LCFR）, a small, oligotrophic mountain loch in northwest Scotland for a taphonomic study of cladoceran zooplankton. The trap was emptied on a seasonal basis, where an average 0.14 g dry material was recovered in each season, January, May and August 2002 respectively. A sediment core was also taken from near the sediment trap location. The top 0.5 cm section, the ＇core＇ was used for a comparative study with the trap sediment samples. The planktonic Cladocera consisted of Bosmina coregoni and appeared to have excellent preservation in the trap assemblages. Moreover, some common littoral Cladocera such as Alonella excisa and Aloha guttata appear to be less well preserved in the fossil assemblages. Large littoral taxa such as Eurycercus lamellatus and Aloha quadrangularis were rare in the trap but relatively common and well preserved in the sediment-water interface. It is suggested that taphonomic processes play a dominant role on deposition of fossil remains of Cladocera and caution should be taken while inferring the past environmental changes whilst using fossil assemblages recovered from the lake centre as a representation of the entire cladoceran community in the lake.

关键词： Cladocera mountain lakes taphonomy representativity sediment trap core-top Loch CoireFionnaraich Scotland

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