1982—2015年科尔沁沙地植被时空变化及气候响应

doi:10.13866/j.azr.2021.02.25

Abstract

Abstract:

Based on the latest GIMMS NDVI3g.v1 data, temperature and precipitation data from 1982 to 2015, combined with trend analysis, variation coefficient, Hurst index and partial correlation analysis, this paper analyzes the spatiotemporal variation characteristics, trend characteristics, sustainability and future change trend of vegetation coverage in Horqin Sandy Land. The results show that: (1) the vegetation coverage of Horqin Sandy Land revealed a slow increasing trend during 1982-2015 (linear tendency 0.23% per 10 year). The change of vegetation coverage can be divided into “three ascendings” (1982-1999, 2000-2004, 2008-2012) and “three descendings” (1999-2000, 2004-2007, 2012-2015) on the whole, of which the maximum occurs in 1999 and the minimum in 2009. (2) In terms of spatial distribution characteristic, the vegetation coverage of Horqin Sandy Land showed a “high in the north and south and low in the middle” pattern. The low value areas accounted for 6.91%, which were concentrated in the east of Ongniud Banner and the Northwest of Naiman Banner, and these areas were mainly desert grassland and bare land. (3) Taking the “Xar Moron River-Xinkai River” as the boundary, the vegetation in the northern area is continuously degraded, while the southern area is continuously improved. The areas of significant improvement accounted for 33.05%, which were mainly distributed in the south of “Xar Moron River-Xinkai River”. (4) Hurst index analysis showed that the same characteristics of vegetation coverage change were stronger than the reverse characteristics in the Horqin Sandy Land. The areas of continuous degradation and continuous improvement accounted for 61.48% and 37.03%, respectively. (5) The average partial correlation coefficients between NDVI_max and precipitation and temperature were 0.23 and 0.03, respectively, indicating that the influence of precipitation on vegetation coverage was stronger than temperature. NDVI was positively correlated with precipitation, which accounted for 91.85% of the total area.

Key words: Horqin Sandy Land, NDVI3g.v1, spatio-temporal variation, climate response, Hurst index, partial correlation analysis

CUI Zhenzhen,MA Chao,CHEN Dengkui. Spatiotemporal variation of vegetation in the Horqin Sandy Land and its response to climate change from 1982-2015[J].Arid Zone Research, 2021, 38(2): 536-544.

Figures/Tables 8

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Spatiotemporal variation of vegetation in the Horqin Sandy Land and its response to climate change from 1982-2015

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