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[1]QIN Gexia,LU Qian,MENG Zhiyuan,et al.Spatial-temporal Dynamics of Grassland NDVI and Its Response to Climate Change in Northern China from 1982 to 2015[J].Research of Soil and Water Conservation,2021,28(01):101-108.

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Spatial-temporal Dynamics of Grassland NDVI and Its Response to Climate Change in Northern China from 1982 to 2015

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 01 Page number: 101-108 Column: Public date: 2021-01-10

Title:: Spatial-temporal Dynamics of Grassland NDVI and Its Response to Climate Change in Northern China from 1982 to 2015

Author(s):: QIN Gexia¹, LU Qian¹, MENG Zhiyuan², LI Zheng¹, CHEN Hongyu¹, KONG Jie¹, JI Zhenxia¹, QIN Anning ³; (1.College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou 730070, China; 2.Xi'an Dongfanghongye Technology Co., Ltd, Xi'an 710000, China; 3.School of Mechanical Engineering, Suzhou University of Science and Technology, Suzhou, Jiangsu 215009, China)

Keywords:: dynamics of NDVI; grassland; spatial heterogeneity; climate change

CLC:: S181

DOI:: -

Abstract:: Understanding the spatial-temporal changes of grassland is of great significance to regional environmental protection and ecological construction. The spatial-temporal variation characteristics of grassland was analyzed based on the GIMMS NDVI 3g data, meteorological data and DEM data for northern China during the period 1982 to 2015. The results indicate that:(1)NDVI mainly showed growth trend from 1982 to 2015, with growth rates of 0.000 2/decade(76%); the growth rate of slope grassland was the(0.001/10 a), the growth rates of alpine and sub-alpine plain grassland were the smallest, and the growth rates of the NDVI of the other four grassland types decreased in the order: plain grassland>alpine subalpine meadow >desert grassland>meadow;(2)the average coefficient of variation of grassland NDVI was 0.078, with the stable state(C_v<0.15);(3)the average Hurst value was 0.42; according to the coupling results of NDVI and Hurst index, it is found that the future NDVI change trend of the grassland will mainly reduce(0<H<0.5, accounting for 79.8%);(4)precipitation was the main factor for grassland growth in northwest China except for higher latitudes; In snow-covered areas, 92.4% of the precipitation was favorable for NDVI growth except Kunlun Mountains, the bottom of the eastern slope of the Qinghai Plateau temperature and the Iljehari-Alin, precipitation in other areas and NDVI had positive correlation; the NDVI of grassland was mainly positive correlation(62.7%)with temperature, and the negative correlation areas concentrated in Inner Mongolia Plateau, the southwest of Loess Plateau, Junggar Basin and Tarim Basin. The above results are expected to provide important reference information for grassland resource management, ecological environment protection and desertification control.

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Last Update: 2021-01-15