Analysis on the Change of Grassland Coverage in the Source Region of Three Rivers during 2000-2012

35th International Symposium on Remote Sensing of Environment

地球科学;生态环境科学

Luo, Chengfeng^1 ; Wang, Jiao^1 ; Liu, Meilin^1 ; Liu, Zhengjun^1

Institute of Photogrammetry and Remote Sensing, Chinese Academy of Surveying and Mapping, Beijing 100830, China^1

关键词: Density modeling;    Ecological environments;    Ecological functions;    Ecological security;    Production practice;    Qinghai Tibet plateau;    Response to environment;    Vegetation coverage;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/17/1/012062/pdf
DOI  :  10.1088/1755-1315/17/1/012062

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The Source Region of Three Rivers (SRTR) has very important ecological functions which form an ecological security barrier for China's Qinghai-Tibet plateau. As the biggest nationally occuring nature reserve region in China, the ecological environment here is very fragile. In SRTR the grassland coverage is an effective detector to reflect the ecological environment condition, because it records the changing process of climatic and environmental sensitively. In recent years SRTR has been suffering pressures from both nature and social pressures. With MODIS data the study monitored the grassland coverage continuously in SRTR from 2000 to 2012. The density-model was adapted to estimate grassland coverage degree firstly. Then the degree of change and the change intensity, change type were used to judge the grassland coverage change trend comprehensively. For grassland coverage there was natural change annual or within the year, and the degree of change was used to judge if there was change or not. The grassland has another important characteristic, annual fluctuation, and it can be differed from sustained changes with change type. For grassland coverage, such continuous change, like improvement or degradation, and to what extent, has more guidance sense on specific production practice. On the base of change type and degree of change, change intensity was used to identify the change trend of the grassland coverage. The analysis results from our study show that steady state and fluctuation are two main change trends for the vegetation coverage in SRTR from 2000 to 2012. The conclusion of this paper can provide references in response to environment change research and in the regional ecological environmental protection project in SRTR.