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Climate change tendency and grassland vegetation response during the growth season in three-river Source Region

Science China Earth Sciences 2010年第10期53卷 1506-1512页

作者： QIAN Shuan1,FU Yang2 & PAN FeiFei3 1 National Meteorological Center,Beijing 100081,China 2 Qinghai Meteorological Research Institute,Xining 810001,China 3 Department of Geography,University of North Texas,Denton,TX 76203,USA 1. National Meteorological Center Beijing 100081 China2. Qinghai Meteorological Research Institute Xining 810001 China3. Department of Geography University of North Texas Denton TX 76203 USA

Climate change,climate suitablity change for grassland vegetation,and grassland response to climate change during the growth season are studied systematically by using meteorological data of temperature,precipitation,and length of sunlight from 1961 to 2007,NOAA/AVHRR NDVI from 1982 to 2006,and observations of grass height,biomass,and coverage in enclosed grassland from 1994 to *** models are developed to evaluate climate change and the climatic suitability of grassland vegetation *** temperature,accumulative precipitation,and length of sunlight during the growth season increased from 1961 to 2007 at rates of 0.24°C/10 yr,2.32 mm/10 yr,and 2.81 h/10 yr,*** increase rates of ave-rage temperature between April and May,and between June and August are 0.17 and 0.30°C/10 yr;accumulative rainfall between April and May increased at a rate of 2.80 mm/10 yr,and accumulative rainfall between June and August decreased at a rate of 0.38 mm/10 yr;the increase rates of accumulative length of sunlight between April and May,and between June and August are 2.15 and 1.2 h/10 *** climatic suitability of grassland vegetation growth showed an increasing trend,and the increase rate between April and May is greater than that between June and *** NDVI observations from 1982 to 2006 and measurements of grass height,dry biomass,and coverage from 1994 to 2006 show that the climate change has resulted in an increase in plant productivity of the grassland in three-river Source *** some protection measures are taken as soon as possible,the deteriorated grassland in three-river Source Region can recover.

关键词： climate change climate suitability change grassland vegetation three-river Source Region

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A method for determining vegetation growth process using remote sensing data: A case study in the three-river Headwaters Region, China

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Journal of Mountain Science 2019年第9期16卷 2001-2014页

作者： CHEN Tian-tian YI Gui-hua ZHANG Ting-bin WANG Qiang BIE Xiao-juan Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China University of Chinese Academy of Sciences Beijing 100049 China School of Geography and Tourism Chongqing Normal University Chongqing 401331 China College of Management Science Chengdu University of Technology Chengdu 610059 China College of Earth Science Chengdu University of Technology Chengdu 610059 China Chongqing Institute of Surveying and Planning for Land Resources and Housing Chongqing 400020 China

Accurate measurements of the associated vegetation phenological dynamics are crucial for understanding the relationship between climate change and terrestrial ecosystems. However, at present, most vegetation phenological calculations are based on a single algorithm or method. Because of the spatial, temporal, and ecological complexity of the vegetation growth processes, a single algorithm or method for monitoring all these processes has been indicated to be elusive. Therefore, in this study, from the perspective of plant growth characteristics, we established a method to remotely determine the start of the growth season(SOG) and the end of the growth season(EOG), in which the maximum relative change rate of the normalized difference vegetation index(NDVI) corresponds to the SOG, and the next minimum absolute change rate of the NDVI corresponds to the EOG. Taking the three-river Headwaters Region in 2000–2013 as an example, we ascertained the spatiotemporal and vertical characteristics of its vegetation phenological changes. Then, in contrast to the actual air temperature data, observed data and other related studies, we found that the SOG and EOG calculated by the proposed method is closer to the time corresponding to the air temperature, and the trends of the SOG and EOG calculated by the proposed method are in good agreement with other relevant studies. Meantime, the error of the SOG between the calculated and observed in this study is smaller than that in other studies.

关键词： Vegetation phenology Normalized difference vegetation index (NDVI) Start of the growth season (SOG) End of the growth season (EOG) three-river Headwaters Region(TRHR)

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Review of the three-river Project

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China's Tibet 1998年第1期9卷 15-16页

ＲｅｖｉｅｗｏｆｔｈｅＴｈｒｅｅＲｉｖｅｒＰｒｏｊｅｃｔＹＡＮＺＨＥＮＺＨＯＮＧＣｏｍｐｒｅｈｅｎｓｉｖｅｄｅｖｅｌｏｐｍｅｎｔｏｆｔｈｅｃｅｎｔｒａｌｐａｒｔｏｆｔｈｅＹａｒｌｕｎｇＺａｎｇｂｏ，ＮｙａｎｇＱｕａ... 详细信息

ＲｅｖｉｅｗｏｆｔｈｅＴｈｒｅｅＲｉｖｅｒＰｒｏｊｅｃｔＹＡＮＺＨＥＮＺＨＯＮＧＣｏｍｐｒｅｈｅｎｓｉｖｅｄｅｖｅｌｏｐｍｅｎｔｏｆｔｈｅｃｅｎｔｒａｌｐａｒｔｏｆｔｈｅＹａｒｌｕｎｇＺａｎｇｂｏ，ＮｙａｎｇＱｕａｎｄＬｈａｓａｒｉｖｅｒｖａｌｅｙ...

关键词： Project the three-river Review

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