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Additive effects of warming and grazing on fine-root decomposition and loss of nutrients in an alpine meadow

Journal of Plant ecology 2022年第6期15卷 1273-1284页

作者： Yang Zhou Wang-Wang Lv Shi-Ping Wang Li-Rong Zhang Jian-Ping Sun Li-Li Jiang Pei-Pei Liu Qi Wang Bo-Wen Li AWang Huan Hong Su-Ren Zhang Lu Xia Nan Ji Zheng-Xin Xie Cai-Yun Luo Zhen-Hua Zhang Chang-Hui Wang Jin-Zhi Wang Ci Yang Tsechoe Dorji key laboratory of alpine ecology Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China University of the Chinese Academy of sciences Beijing 100049China cas center for excellence in tibetan plateau earth Science of the Chinese Academy of sciences Beijing 100101China Department of Resources and Environment Hebei Normal University for NationalitiesChengde 067600China Science College Tibet UniversityLhasa 850001China Northwestern Institute of plateau Biology Chinese Academy of SciencesQinghai Provincial Key Laboratory of Restoration Ecology of Cold AreaXining 810008China Grassland College Shanxi Agriculture UniversityTaigu 030801China Wetland Institute Chinese Academy of ForestryBeijing 100093China center for Meteorology Meteorological Bureau of Tibet Autonomous RegionLhasa 850000China

Fine-root decomposition is a critical process regulating ecosystem carbon cycles and affecting nutrient cycling and soil ***,whether interaction between warming and grazing affects fine-root decomposition is still under-researched in natural grasslands.A two-factorial experiment with asymmetric warming(*** *** and growing season *** season)and moderate grazing(*** average 50%forage utilization rate)was conducted to explore whether warming and grazing affect fine-root decomposition and loss of nutrients during a 2-year decomposition period in an alpine meadow on the tibetan *** warming and grazing facilitated carbon cycling through increase in fine-root decomposition,and influenced element cycling which varies among *** effects of warming and grazing on fine-root decomposition and loss of nutrients were *** warming and grazing significantly increased cumulative percentage mass loss and total organic carbon loss of fine roots during the 2-year *** warming with grazing treatment reduced percentage nitrogen loss,whereas warming,regardless of grazing,decreased percentage phosphorus *** and grazing alone increased percentage loss of potassium,sodium,calcium and magnesium compared with *** were no interactions between warming and grazing on fine-root decomposition and loss of *** was greater temperature sensitivity of decreased phosphorus loss than that of decreased nitrogen *** temperature sensitivities of percentage loss of nutrients from fine-root decomposition would alter ratios of the available nutrients in soils,and may further affect ecosystem structure and functions in future warming.

关键词： root decomposition organic carbon loss loss of nutrients warming and grazing alpine meadow tibetan plateau

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Pliocene flora and paleoenvironment of Zanda Basin, Tibet, China

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Science China earth sciences 2020年第2期63卷 212-223页

作者： Jian HUANG Tao SU Shufeng LI Feixiang WU Tao DENG Zhekun ZHOU cas key laboratory of Tropical Forest ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesXishuangbanna 666303China University of Chinese Academy of sciences Beijing 100049China Kunming Institute of Botany Chinese Academy of SciencesKunming 650201China Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of SciencesBeijing 100044China center for excellence in Life and Paleoenvironment Chinese Academy of SciencesBeijing 100044China

This paper describes a plant megafossil assemblage from the Pliocene strata of Xiangzi, Zanda Basin in the western Qinghai-Tibet plateau. Twenty-one species belonging to 12 genera and 10 families were identified. Studies show that the Pliocene vegetation in Zanda Basin was mostly deciduous shrub composed of Cotoneaster, Spiraea, Caragana, Hippophae,Rhododendron, Potentilla fruticosa, etc. Leaf sizes of these taxa were generally small. Paleoclimate reconstruction using Coexistence Analysis and CLAMP showed that this area had higher temperature and precipitation in the Pliocene than today, and distinct seasonal precipitation variability was established. The reconstructed paleoelevation of Zanda Basin in the Pliocene was similar to modern times. In the context of central Asian aridification, the gradual drought in the area beginning in the late Cenozoic caused vegetation to transition from shrub to desert, and the flora composition also changed.

关键词： Qinghai-Tibet plateau Cenozoic Pliocene Plant fossils Paleovegetation Paleoclimate Environmental change

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Combating climate change in a post-COVID-19 era

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Science Bulletin 2020年第23期65卷 1958-1960页

作者： Nianzhi Jiao Fahu Chen Zengqian Hou State key laboratory of Marine Environmental Science and College of Ocean and earth sciences Xiamen UniversityXiamen 361005China Joint Lab for Ocean Research and Education(LORE)at Dalhousie University HalifaxNS B3H 4R2Canada Shandong University Ji'nan 266200China key laboratory of alpine ecology Center for Excellence in Tibetan Plateau Earth Sciences and Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China key laboratory of Western China’s Environmental Systems(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China National Natural Science Foundation of China Beijing 100085China

An unprecedented global crisis of COVID-19 pandemic evokes the world’s thinking about the future of humankind. This pandemic is no doubt one of the major disasters in human history, comparable to the medieval Black Death(bubonic plague), and the 1918 influenza. It is even called the ‘‘Third World War" because of the profound impacts on the political, economic and global *** as historical event。

关键词： doubt profound thinking

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2060年中国实现碳中和所面临的挑战:现状与展望

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Science Bulletin 2022年第20期67卷 2030-2035,M0003页

作者： Baozhang Chen Fahu Chen Philippe Ciais Huifang Zhang Honggang Lü Tao Wang Frédéric Chevallier Zhu Liu Wenping Yuan Wouter Peters School of Remote Sensing and Geomatics Engineering Nanjing University of Information Science and TechnologyNanjing 210044China State key laboratory of Resource and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100190China alpine Paleoecology and Human Adaption Group State Key Laboratory of Tibetan Plateau Earth System ScienceInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101Chin Laboratoire des sciences du Climat et de l’Environnement CEA-CNRS-UVSQUniversitéParis-SaclayGif-sur-Yvette 91191France key laboratory of Marine Hazards Forecasting National Marine Environmental Forecasting CenterMinistry of Natural Resources of ChinaBeijing 100081China key laboratory of alpine ecology Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100085China center for excellence in tibetan earth Science Chinese Academy of SciencesBeijing 100085China Department of earth System Science Tsinghua UniversityBeijing 100084China School of Atmospheric sciences Guangdong Province Key Laboratory for Climate Change and Natural Disaster StudiesZhuhai Key Laboratory of Dynamics Urban Climate and EcologySun Yat-sen UniversityZhuhai510245China Department of Meteorology and Air Quality Environmental Sciences GroupWageningen UniversityWageningen 6708 PBthe Netherlands Centre for Isotope Research Energy and Sustainability Research Institute GroningenGroningen UniversityGroningen 729700 ABthe Netherlands

China’s high ambitions to reach peak CO_(2) emissions by 2030 and carbon neutrality by 2060 make carbon mitigation an urgent issue with widespread societal *** develop an achievable roadmap and an effective portfolio of climate policies,it is essential that a clear picture of the magnitude and uncertainty of China’s current carbon balance is available,at both national and regional levels.

关键词：碳中和 consequences neutral

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High-resolution reconstruction of April-September precipitation and major extreme droughts in China over the past∼530 years

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Science Bulletin 2024年第17期69卷 2756-2764页

作者： Yongxiang Zhang Hongli Wang Xuemei Shao Hongbin Liu Haifeng Zhu Lily Wang Eryuan Liang Zhixin Hao Xiuqi Fang Qibin Zhang Jinjian Li Xinghe Shi Yujiang Yuan Feng Chen Tongwen Zhang Ruibo Zhang Huaming Shang Jianfeng Peng National Climate Centre China Meteorological AdministrationBeijing 100081China key laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Beijing New Epoch School the Administrative Bureau of Chinese Academy of SciencesBeijing 100086China University of Chinese Academy of sciences Beijing 100049China key laboratory of alpine ecology Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China cas center for excellence in tibetan plateau earth sciences Beijing 100101China Faculty of Geographical Science Beijing Normal UniversityBeijing 100875China State key laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China School of Atmospheric sciences Plateau Atmosphere and Environment Key Laboratory of Sichuan ProvinceChengdu University of Information TechnologyChengdu 610225China Qinghai Climate Centre Xining 810001 China key laboratory of Tree-Ring Physical and Chemical Research of China Meteorological Administration Key Laboratory of Tree-Ring Ecology of Xinjiang Uygur Autonomous RegionInstitute of Desert MeteorologyChina Meteorological AdministrationUrumqi 830002China Yunnan key laboratory of International Rivers and Transboundary Eco-Security Institute of International Rivers and Eco-SecurityYunnan UniversityKunming 650000China College of Geography and Environmental Science Henan UniversityKaifeng 475004China

Extreme drought events have increased,causing serious losses and damage to the social economy under current warming ***,short-term meteorological data limit our understanding and projection of these *** the accumulation of proxy data,especially tree-ring data,large-scale precipitation field reconstruction has provided opportunities to explore underlying mechanisms *** point-by-point regression,we reconstructed the April-September precipitation field in China for the past~530 years on the basis of 590 proxy records,including 470 tree-ring width chronologies and 120 drought/flood *** regression models explained average 50%of the variance in *** the statistical test on calibration and verification,our models passed the significance level that assured reconstruction *** reconstruction data performed well,showing consistency and better quality than previously reported *** first three leading modes of variability in the reconstruction revealed the main distribution modes of precipitation over ***/drought and extremely wet/drought years accounted for 12.81%/10.92%(68 years/58 years)and 1.69%/3.20%(9 years/17 years)of the past~530 years in China,*** extreme drought events can be identified explicitly in our *** detailed features of the Chongzhen Great Drought(1637-1643),the Wanli Great Drought(1585-1590),and the Ding-Wu Great Famine(1874-1879),indicated the existence of potentially different underlying mechanisms that need further *** further improvements can be made for remote uninhabited areas and large deserts,our gridded reconstruction of April-September precipitation in China over the past~530 years can provide a solid database for studies on the attribution of climate change and the mechanism of extreme drought events.

关键词： Precipitation reconstruction Tree rings Historical documents Precipitation variability Extreme droughts

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From unusual suspect to serial killer: Cyanotoxins boosted by climate change may jeopardize megafauna

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The Innovation 2021年第2期2卷 73-75页

作者： Haijun Wang Chi Xu Ying Liu Erik Jeppesen Jens-Christian Svenning Jianguo Wu Wenxia Zhang Tianjun Zhou Puze Wang Shingirai Nangombe Jinge Ma Hongtao Duan Jingyun Fang Ping Xie Institute for Ecological Research and Pollution Control of plateau Lakes School of Ecology and Environmental ScienceYunnan UniversityKunmingChina School of Life sciences Nanjing UniversityNanjingChina Department of Bioscience Aarhus UniversitySilkeborgDenmark Sino-Danish Centre for Education and Research BeijingChina Limnology laboratory Department of Biological SciencesMiddle East Technical UniversityAnkaraTurkey Centre for Ecosystem Research and Implementation(EKOSAM) Middle East Technical UniversityAnkaraTurkey Institute of Marine sciences Middle East Technical UniversityMersinTurkey center for Biodiversity Dynamics in a Changing World Department of BioscienceAarhus UniversityAarhusDenmark School of Life sciences and School of Sustainability Arizona State UniversityTempeAZUSA State key laboratory of Numerical Modeling for Atmospheric sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina cas center for excellence in tibetan plateau earth sciences Chinese Academy of SciencesBeijingChina University of Chinese Academy of sciences BeijingChina Meteorological Services Department HarareZimbabwe Deutscher Wetterdienst PotsdamGermany Nanjing Institute of Geography and Limnology Chinese Academy of SciencesNanjingChina Yunnan University KunmingChina Department of ecology College of Urban and Environments SciencesPeiking UniversityBeijingChina Donghu Experimental Station of Lake Ecosystems State Key Laboratory of Freshwater Ecology and BiotechnologyInstitute of HydrobiologyChinese Academy of SciencesWuhanChina

The recent mass mortality event of more than 330 African elephants in Botswana has been attributed to biotoxins produced by cyanobacteria;however,scientific evidence for this is ***,by synthesizing multiple sources of data,we show that,during the past decades,the widespread hypertrophic waters in Southern Africa have entailed an extremely high risk and frequent exposure of cyanotoxins to the wildlife within this area,which functions as a hotspot of mammal species *** hot and dry climatic extremes have most likely acted as the primary trigger of the recent and perhaps also of prehistoric mass mortality *** such climate extremes are projected to become more frequent in Southern Africa in the near future,there is a risk that similar tragedies may take place,rendering African megafauna species,especially those that are already endangered,in risk of ***,cyanotoxin poisoning amplified by climate change may have unexpected cascading effects on human *** within this perspective,the tragic mass death of the world's largest terrestrial mammal species serves as an alarming early warning signal of future environmental catastrophes in Southern *** suggest that systematic,quantitative cyanotoxin risk assessments are made and precautionary actions to mitigate the risks are taken without hesitation to ensure the health and sustainability of the megafauna and human societies within the region.

关键词： cyanobacteria toxin climate change eutrophication mammal conservation environmental health

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An atmospheric perspective on the carbon budgets of terrestrial ecosystems in China:progress and challenges

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Science Bulletin 2021年第17期66卷 1713-1718,M0003页

作者： Baozhang Chen Huifang Zhang Tao Wang Xiaoye Zhang School of Remote Sensing and Geomatics Engineering Nanjing University of Information Science and TechnologyNanjing 210044China State key laboratory of Resource and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Monitoring&Assessment center for GHGs(Greenhouse Gases)&Carbon Neutrality Institute of Atmospheric Composition and Environmental MeteorologyChinese Academy of Meteorological SciencesBeijing 100081China 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 100085China center for excellence in tibetan earth Science Chinese Academy of SciencesBeijing 100085China

The atmospheric inversion is an effective method for quantifying surface CO_(2) fluxes at global and regional scales using the gradient of CO_(2) measurements and has the advantage of inferring CO_(2) sources and sinks over large spatial ***“2019 Refinement to the 2006 IPCC Guidelines for National Greenhouse Gas Inventories”was adopted and accepted during the 49th Session of the Intergovernmental Panel on Climate Change(IPCC)in May 2019.

关键词： scales 进展与挑战 sink

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物种异步性在不同增温条件下维持群落稳定性

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Journal of Plant ecology 2024年第3期17卷 104-114页

作者： Qianxin Jiang Juntao Zhu Peili Shi Yunlong He Yangjian Zhang Jun Yan Wendong Xie Ning Zong Ge Hou Ruonan Shen Jiahe Zheng key laboratory of Ecosystem Network Observation and Modelling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100190China center for excellence in tibetan plateau earth sciences Chinese Academy of SciencesBeijing 100101China Nagqu Agricultural and Animal Husbandry Science and Technology Research and Promotion center Nagqu 852000China

不对称季节性增温,即冬季的温度增加明显高于夏季,已成为全球变暖的一个重要特征,尤其在寒冷和高海拔地区。过去的研究主要关注全年的温度增高,而对冬季增温的关注相对较少。然而,关于冬季增温对生态系统功能的影响存在显著的知识空缺... 详细信息

不对称季节性增温,即冬季的温度增加明显高于夏季,已成为全球变暖的一个重要特征,尤其在寒冷和高海拔地区。过去的研究主要关注全年的温度增高,而对冬季增温的关注相对较少。然而,关于冬季增温对生态系统功能的影响存在显著的知识空缺。为了解决这个问题,我们在青藏高原的高寒草甸进行了为期8年的控制增温实验,设置3种处理:自然对照、全年增温和冬季增温。结果发现,无论是全年增温还是冬季增温都没有显著改变群落水平的物种丰富度。值得注意的是,通过物种异步性,群落生物量的稳定性得以维持。然而,增温对植物丰度组(优势种、常见种和稀有种)产生了显著影响。具体而言,冬季增温增强了优势种的稳定性,这是通过增加优势种的物种异步性,即禾本科植物和非禾本科杂草植物之间发生了补偿动态来实现的。相反,全年增温降低了常见种的稳定性,这与常见种丰富度的增加和常见种中异步性的下降相关。因此,本研究强调了高寒草甸在不同增温条件下通过物种异步动态来维持群落生物量稳定性的能力,这些研究结果为理解青藏高原高寒草甸生态系统特征提供了新见解。

关键词：不对称季节性增温优势种生态水平物种异步性时间稳定性冬季增温

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Fisher discriminant analysis method applied in drought detection:an instance in an alpine meadow ecosystem

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Journal of Plant ecology 2022年第5期15卷 911-920页

作者： Tao Zhang Ximeng Ji Yuanyuan Tang Mingjie Xu Yangjian Zhang Guang Zhao Ning Chen Juntao Zhu Yongtao He College of Agronomy Shenyang Agricultural UniversityShenyang 110866China key laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 1oo1olChina center for excellence in tibetan plateau earth sciences Chinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 10o049China key laboratory of Wetland ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102China

Fisher discriminant analysis can comprehensively take multiple factors into consideration and effectively conduct separations between two *** it can be used to detect the occurrences of drought,drought can be detected more effectively and *** on 9-year carbon flux and corresponding meteorological data,soil water content(SWC)and vapor pressure deficit(VPD)were selected as the discriminant *** occurrences were detected by applying the Fisher discriminant analysis method in an alpine ecosystem in *** discriminant analysis was successfully applied to detect drought occurrence in an alpine meadow *** soil water deficit and atmospheric water deficit were comprehensively taken into ***,this method could detect the onset and end date of droughts more accurately and *** on the characteristics of drought and non-drought samples,the discriminant equation was constructed as y=*** y>1,the days were distributed above the critical *** addition,when y was greater than one for more than 10 days,it was labeled as one drought *** the interval between two drought processes was less than 2 days,it was considered one drought *** increasing the study period and continued accumulation of observation data,the discriminant equation could be further optimized in the future,resulting in more accurate drought detection.

关键词： soil water VPD GPP alpine meadow tibetan plateau

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路网扩张对董志塬景观生态的影响

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Journal of Geographical sciences 2023年第12期33卷 2549-2566页

作者：杨思齐金钊罗达冯立 State key laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentCASXi’an710061China State key laboratory of earth Surface Processes and Resource ecology Faculty of Geographical ScienceBeijing Normal UniversityBeijing100875China cas center for excellence in Quaternary Science and Global Change Xi’an710061China University of Chinese Academy of sciences Beijing100049China Institute of Global Environmental Change Xi’an Jiaotong UniversityXi’an710049China

Road network expansion can result in the fragmentation of ecological landscapes due to the transformation of landscape processes and ***,knowledge about these processes and patterns is *** this study,the road network and landscape patterns in the Dongzhi tableland of the Chinese Loess plateau(CLP) between 2005 and 2020 were characterized,and their spatial relationships were *** results showed that(1) the kernel density estimation(KDE) method is useful in characterizing road network *** the bandwidth value is four,the boundary of the road network kernel can be distinguished clearly.(2) The road network in the tableland expanded greatly over the past 15 years,and the total area of road kernels in the Dongzhi tableland increased from 55.73 km~2 in 2005 to 223.55 km~2 in 2020.(3) High-density road networks were generally distributed on cultivated and constructed lands where the slopes were generally 0°–5°,while low-and medium-density road networks were mostly distributed in grassland areas where the slopes were greater than 5°.(4) Road network density is closely related to the coverage of cultivated and constructed *** results of this study are helpful in understanding the potential impact of road network evolution on the landscape at a regional scale.

关键词： kernel density estimation road network expansion landscape metrics loess tableland

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