绿洲荒漠过渡带生态环境变化预警线提取与分析研究以新疆和田绿洲为例

摘要/Abstract

摘要：

运用MODIS时间序列数据,以干旱区和田绿洲为例,在对2002年、2004年SMVC-NDVI（Seasonal Maximum Value Composite NDVI）图进行分类后,通过对土地覆盖变化类型多度、重要度和评价等级的计算,将干旱区绿洲的生态环境强烈变化区定位于低草和中草的界限,并以此提取了过渡带生态环境变化的预警线。结果表明：从2002—2004年,预警线呈现整体缩小趋势,说明绿洲整体的生态环境在这3 a内有所退化,向恶性发展。通过对以气候因子为主的自然和人类活动因素定量分析后,认为预警线对干旱区荒漠绿洲脆弱生态环境的连续实时监测和可持续性发展研究具有很好的指示作用。

关键词: MODIS数据, 绿洲荒漠过渡带, SMVC-NDVI, 预警线

Abstract: Taking the Hetian oasis in arid area as an example, the paper firstly applied the time series of MODIS data to classify the SMVC-NDVI (Seasonal Maximum Value Composite NDVI) images of 2002 and 2004, then computed the multi-degree of land-cover change types, the important degree and the evaluation grade, lastly identified that the region of violent ecological environmental change in arid oasis is the boundary between low-grass and mid-grass. From classified images the precautious lines on ecological environmental change of transitional belt was extracted. The result shows that the area within the precautious line generally shrunk from 2002 to 2004, which expressed that the ecological environment of oasis was degraded in the three years. After quantitatively analyzing the reasons of oasis degradation, they are the human activities and the natural factors with climatic factor as main, the authors think that the precautious line has good indicative significance for continuous monitoring on vulnerable ecological environment and researching on sustainable development of oasis-desert transitional belt.

Key words: MODIS data, oasis-desert transitional belt, SMVC-NDVI, precautious line

中图分类号:

X171.1

李谢辉;塔西甫拉提·特依拜. 绿洲荒漠过渡带生态环境变化预警线提取与分析研究以新疆和田绿洲为例[J]. 中国沙漠, 2008, 28(1): 77-82.

LI Xie hui;TIYIP Tashpolat. Extraction of Precautious Line and Analysis on Ecological Environmental Change in Oasis Desert Transitional Belt—A case study of Hetian oasis,Xinjiang[J]. JOURNAL OF DESERT RESEARCH, 2008, 28(1): 77-82.

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