Responses of Vegetation in Mu Us Sandy Land to Climate Change from 1982 to 2020

doi:10.13466/j.cnki.lyzygl.2023.03.011

Abstract

Abstract:

Mu Us Sandy Land belongs to the agro-pastoral staggered area in northern China,the ecological environment is fragile,and the vegetation growth is greatly affected by the climatic environment.Based on GIMMS NDVI3g.v1 from 1982 to 1999 and MOD13Q1 from 2000 to 2020,combined with the temperature and precipitation data of relevant meteorological stations,this paper discussed the spatiotemporal characteristics of vegetation growth and its response to climate change in Mu Us Sandy Land from 1982 to 2020 by using trend analysis,coefficient of variation,partial correlation analysis and Hurst index.The research results showed:1) The vegetation growth of Mu Us Sandy Land showed a continuous upward trend,with an increase rate of 1.3% per 10 a,with 2005 being the inflection point,and the vegetation growth being slow before 2005 and rapidly thereafter.2) The NDVI_average range of Mu Us Sandy Land was between 0.10~<0.41,and spatial distribution characterized by "low west and high east ",and the change trend was mainly increased,accounting for about 94.07% of the total area,of which a significant increase accounted for 57.43% and a very significant increase accounted for 30.14%;The spatial variation and stability of vegetation varied significantly,and the proportion of high fluctuation change area was 35.95%,and the bands were distributed in areas with strong vegetation growth at the southeast edge of sandy land.3) The positive correlation coefficient between NDVI and temperature in April,June and August was high,and the positive correlation coefficient between NDVI and precipitation from June to September was strong,and precipitation had a greater impact on the growth and development of sandy vegetation,and the co-directional characteristics of vegetation change were stronger than the reverse characteristics.4) The future change trend of Mu Us Sandy Land would be mainly continuous improvement and continuous degradation,with continuous improvement accounting for 51.49% of the total area and continuous degradation accounting for 46.49%.

Key words: Mu Us Sandy Land, temporal and spatial change, climate response, trend analysis, coefficient of variation, partial correlation analysis, Hurst index

CLC Number:

Q948

WANG Cuiping, HAN Xiaohong, WANG Haochen, YOU Jiaqi. Responses of Vegetation in Mu Us Sandy Land to Climate Change from 1982 to 2020[J]. FOREST RESOURCES WANAGEMENT, 2023, 0(3): 80-89.

Figures/Tables 10

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变化等级	变异系数范围	面积占比/%
高波动	0.13~1.27	35.95
较高波动	0.10~<0.13	21.10
中等波动	0.08~<0.10	17.58
较低波动	0.05~<0.08	23.06
低波动	0.02~<0.05	2.30