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[1]SUN Meirong,SUN Pengsen.Climate-Driving Effects and Sustainability of Vegetation Activity Change in Alpine and Subalpine Areas of Southwest China[J].Research of Soil and Water Conservation,2023,30(03):240-250.[doi:10.13869/j.cnki.rswc.2023.03.018]

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Climate-Driving Effects and Sustainability of Vegetation Activity Change in Alpine and Subalpine Areas of Southwest China

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 03 Page number: 240-250 Column: Public date: 2023-04-10

Title:: Climate-Driving Effects and Sustainability of Vegetation Activity Change in Alpine and Subalpine Areas of Southwest China

Author(s):: SUN Meirong¹, SUN Pengsen¹; (Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing 100091, China)

Keywords:: vegetation activity; climate driving effect; coefficient of variation; Hurst exponent; alpine and subalpine areas of southwest China

CLC:: Q948

DOI:: 10.13869/j.cnki.rswc.2023.03.018

Abstract:: [Objective]Exploring the driving factors and sustainability of vegetation activity change can provide a scientific basis for ecosystem management in alpine and subalpine areas of southwest China. [Methods] Based on the MODIS NDVI datasets and meteorological datasets from 2001 to 2018, the temporal and spatial variation characteristics, stability and sustainability of vegetation activity, and its response to climate change in the region were analyzed by using linear regression, Hurst exponent and correlation analysis methods. [Results](1)The vegetation activity represented by NDVI increased significantly in the whole study area and the relatively stable area accounted for 63.69%, the significantly increased area accounted for 25.06%, and the significantly decreased area was 2.73%. Among the vegetation types, deciduous broad-leaved forest had the strongest significant greening trend, while shrub had the strongest browning trend. Grassland was more sensitive to climate change than forest. Vegetation activity increased significantly in the Jialing River and Minjiang River in the northeast of the region.(2)The coefficient of variation(CV)showed that the overall stability of NDVI was strong. From the perspective of vegetation types, the stabilities of broad-leaved forest and mixed forest were higher, and that of farmland was the lowest.(3)Hurst exponent analysis showed that the proportion of vegetation activity in anti-persistent trend was 69.47%. The proportion of vegetation activity in persistent trend was 29.88%. The overall vegetation in the study area showed a weak anti-persistent, and the trend of enhanced vegetation activity has the risk of decreasing or reversing in the future.(4)The analysis of climate driving factors showed that the temperature had a dominant influence on vegetation in alpine and subalpine areas of southwest China, i. e., temperature was not only the key factor promoting vegetation greening, but also the key factor of vegetation browning. In the areas of significant vegetation greening, the temperature driving effect of evergreen broad-leaved forest and evergreen coniferous forest was lower than that of deciduous broad-leaved forest and coniferous mixed forest. However, in the areas of significant vegetation browning, the temperature driving effect of the former two was significantly higher than the latter two. [Conclusion] Temperature is the main climate driver of vegetation activity change, and vegetation activity has the characteristic of weak anti-persistence in the future.

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Last Update: 2023-04-10