中国西北干旱区1981—2001年NDVI对气候变化的响应分析

摘要/Abstract

摘要： 气候变化在不同的区域有着不同的特征,对植被也带来不同的影响,对不同地区气候变化特征的认识及植被变化的相应分析,可使我们对全球变化对干旱区的影响有更深入的认识。通过定量分析,西北干旱区1981—2001年 NOAA/AVHRR数据和同期的气象资料,借助于遥感技术和数理统计知识,分析了1981—2001年我国西北干旱区NDVI变化及其与气候变化的关系。结果显示,1981—2001年间西北干旱区年际最大NDVI的变化与气候变化具有明显的相关性,尤其是对新疆的南、北疆来说,NDVI的变化受到年降水量、年均温和空气相对湿度的影响比较显著,NDVI与年降水量和相对湿度的相关程度要明显比与年均温的相关程度高。甘肃\,内蒙古的河西走廊和青海的柴达木地区NDVI没有明显的变化趋势,同时这两个地区也是年降水量变化最小的地区。从而得出一个结论:降水资源是我国西北干旱区植被生长和生态建设的最重要气象因子,只有充分、合理地利用“降水”这种天然水资源才能最终实现中国西北干旱区环境、社会与经济的可持续发展。

关键词: 响应, 西北干旱区, NDVI, 气候

Abstract: The characteristics of climate variability are diverse in different area. And this variability can bring all kinds of influence to vegetation. The cognition to the characteristics and relevant analysis on vegetation response to this variability help us more deeply know the effect of global change on arid area. By means of remote sensing and statistics this paper quantitatively studies the climatic variability and the response of NDVI to it in arid area of northwestern China from 1981 to 2001 based on NOAA/AVHRR data of 21 years and the simultaneously meteorological information. The result indicates that there is a significant correlation between the NDVI value and the climate variables in the whole study area from 1981 to 2001. Especially in Xinjiang, the NDVI change is apparently affected by precipitation, temperature and their combination. And the NDVI change is positively correlative with annual total precipitation, average annual temperature and annual humidity in Xinjiang. In Hexi corridor of Gansu and the Qaidam basin of Qinghai there is no apparent change trend of NDVI and it is just the place where precipitation varies least. In arid area of northwestern China, precipitation resource is the most key factor to vegetation growth and eco-environmental construction. If only to make good use of precipitation, the sustainable development of environment, society and economy in the arid area of northwestern China can be achieved.

Key words: response, arid area of northwestern China, NDVI, climate

中图分类号:

Q948

李秀花;师庆东;常顺利;齐家国;*. 中国西北干旱区1981—2001年NDVI对气候变化的响应分析[J]. 中国沙漠, 2009, 29(5): 989-994.

LI Xiu-hua;SHI Qing-dong;CHANG Shun-li;QI Jiao-guo;. Response of NDVI to Climate Variability in Arid Area of Northwestern China from 1981 to 2001[J]. JOURNAL OF DESERT RESEARCH, 2009, 29(5): 989-994.

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