Abstract
Abstract. Based on the “pressure-state-response” (PSR) model, comprehensively applied GIS and RS techniques, 20 evaluation indicators were selected based on pressure, state and response, the entropy weight method was used to determine the weight of each index and build a grassland health evaluation system in Changji Prefecture, Xinjiang. Based on this, evaluation and dynamic analysis of grassland health in Changji Prefecture from 2000 to 2016, using GIS/RS technology, the trend of grassland health status in Changji is analyzed and studied. The results show that: 1) Grassland with low health leveld, lower health level, sub-health level, health level and high health level accounts for 1.46 %,27.67 %,38.35 %,29.21 % and 3.31 % of the total area of Changji. Qitai County, Hutubi County, and Manas County are lower health levels, Jimsar County, Changji City, and Mulei County are at a relatively high level, and Fukang City has a healthy level of health. 2) The level of grassland health in Changji County decreased slightly during the 17 years, accounting for 38.42 % of the total area. The area of 23,87 % showed a stable trend, and the improved area accounted for 37.31 % of the vertical surface area.
Highlights
Grassland is the largest ecosystem in China (Fu ZZ., 1996), the status of grassland is of great significance to the development of animal husbandry, biodiversity conservation, soil and water co nservation, and the maintenance of local ecological balance (Xi e GD., 2001)
In order to ac hieve a scientific evaluation of grassland health status, it must c omply with scientific, systematic, dominant, quantifiable and op erability criteria when selecting evaluation indicators
40.64%, 37.56% and 36.73% of the grasslands in Qitai County, Hutubi County and Manas Coun ty respectively belong to low health level; 89.4% of Jimsar Cou nty, Changji City, Mulei County and Fukang City respectively
Summary
Grassland is the largest ecosystem in China (Fu ZZ., 1996), the status of grassland is of great significance to the development of animal husbandry, biodiversity conservation, soil and water co nservation, and the maintenance of local ecological balance (Xi e GD., 2001). The ―Man and Biosphere P roject‖(MAB) that ended in the 1970s took the impact of distur bance factors on ecosystem effects as the main research content. On this basis, disturbance factors were considered into the evaluation system (Concepts T., 1995). Until the 1980s, the UN Environment Committee put forward the concept of sustainable development in the texts such as ―Protection of the Earth‖ and ―Our Common Future‖ and introduced this concept into the gra ssland health assessment system. This study se lected and evaluated the indicators in the existing literature, and formed an evaluation index system to evaluate the health status of grassland in Changji Prefecture in June 2000-2016
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