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[1]LIU Yangyang,REN Hanyu,ZHANG Zhaoying,et al.Temporal and Spatial Dynamic Pattern of Grassland Coverage and Its Influencing Factors in China[J].Research of Soil and Water Conservation,2022,29(02):221-230+242.

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Temporal and Spatial Dynamic Pattern of Grassland Coverage and Its Influencing Factors in China

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 02 Page number: 221-230+242 Column: Public date: 2022-03-20

Title:: Temporal and Spatial Dynamic Pattern of Grassland Coverage and Its Influencing Factors in China

Author(s):: LIU Yangyang¹, REN Hanyu¹, ZHANG Zhaoying², ZHANG Wei¹, ZHANG Zhixin¹, BASANG·Canmujue¹, WANG Yibo¹, WEN Zhongming¹; (1.College of Grassland Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.Nanjing Institute of Environmental Sciences, Nanjing University, Nanjing 210023, China)

Keywords:: grassland coverage; different climatic regions; climate change; altitude gradient; aspect gradient

CLC:: Q948.112

DOI:: -

Abstract:: In order to explore the dynamic changes of grassland coverage in China in recent decades, based on multi-source remote sensing data, we used the pixel dichotomy model to quantitatively calculate the grassland coverage in China from 1982 to 2016, analyzed the temporal and spatial dynamic pattern of grassland coverage in China, and analyzed the influencing factors of grassland coverage from the perspectives of vegetation types, terrain elements, climate regions and climate change. The results showed that the average grassland coverage in China was 36.21% in the past 35 years, showing an extremely significant increase trend(0.12%/a). The increase of grassland coverage in alpine subalpine meadow, slope grassland, humid and semi-arid areas had an important contribution to grassland restoration in China. The increase rate of grassland coverage on DEM<500 m and 3 500 m<DEM was higher than that on southeast slope, northwest slope and southwest slope. The areas with significant positive correlation between grassland coverage and temperature concentrated in central Xinjiang, western Tibet and southern Qinghai Province, while the areas with significant positive correlation with precipitation concentrated in the central and northern Xinjiang, southern Tibet and central and eastern Inner Mongolia. The increase of vegetation coverage of alpine subalpine meadow, slope grassland and alpine subalpine grassland was mainly controlled by temperature, while that of plain grassland, desert grassland and meadow mainly depended on precipitation. The limiting factor of grassland growth in arid area was precipitation, while grassland coverage in humid area was controlled by temperature. Grassland coverage in low altitude areas of China was strongly dependent on temperature and precipitation, and this dependence decreased with the increase of altitude. The growth of grassland in middle altitude areas mainly depended on temperature.

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Last Update: 2022-04-20