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

摘要/Abstract

摘要：

基于1982—2015年GIMMS NDVI3g.v1数据,结合站点气象数据,采用趋势分析、变异系数、Hurst指数及偏相关分析等方法,探讨了科尔沁沙地植被覆盖的时空特征、气候响应及未来趋势。结果表明：（1）科尔沁沙地34 a植被覆盖呈缓慢增加趋势,每10 a增速为0.23%。植被覆盖变化整体上可分为“三升”（1982—1999年、2000—2004年、2008—2012年）和“三降”（1999—2000年、2004—2007年、2012—2015年）的趋势,其中最大值出现在1999年,最小值出现在2009年。（2）科尔沁沙地植被覆盖格局呈“南北高,中间低”的分布特征。以“西拉木伦河—新开河”为界线,北部地区植被变化趋势以退化为主,南部地区以改善为主。（3）科尔沁沙地变异系数西高东低,地域性差异明显。低波动变化区域主要分布在北部海拔较高地区（占5.52%）,其植被类型主要为针阔混交林。（4）科尔沁沙地植被变化的同向特征强于反向特征,持续退化和持续改善区域分别占61.48%和37.03%。降水是影响研究区植被变化的主要因素。

关键词: 科尔沁沙地, NDVI3g.v1, 时空变化, 气候响应, Hurst指数, 偏相关分析

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

崔珍珍,马超,陈登魁. 1982—2015年科尔沁沙地植被时空变化及气候响应[J]. 干旱区研究, 2021, 38(2): 536-544.

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.

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