近20年来河西走廊人工绿洲演变及人为因素分析

Oasis evolution and human factors analysis in Hexi Corridor over the recent 20 years

人工绿洲是人类活动的主要场所,近年来由于河西走廊无序的土地利用及水资源开发,导致绿洲功能不断退化,文中通过GIS和RS技术,详细研究了1990～2010年以来绿洲变化特征,并利用熵权法,定量分析了影响人工绿洲演变的人为因素,通过研究表明在人类活动的干预下,河西走廊的人工绿洲在近20年来不断地扩张,其中以2000～2005年变化最为剧烈;空间上,黑河与石羊河的中下游绿洲变化幅度明显高于党河和疏勒河,河西走廊人工绿洲规模的扩大主要是人类改造自然绿洲或未利用土地获得的;河西走廊现代人工绿洲的演变主要跟人类的经济活动及绿洲自身的承载力密切相关。

The function of oasis in recent was continuously degraded because of disorder of land use and excessive development of water resources in the Hexi corridor.This research detailedly studied the change characteristics of the oasis from 1990 to 2010 through GIS and RS technology and quantitatively analyzed the man-made factors of the evolution of artificial oases using entropy weight method.The research shows that the artificial oases were constantly expanding in the past 20 years in the Hexi corridor because of human activity.The change intense of oases was the most from 2000 to 2005.From space change analysis,the change of oases were located in the middle and lower reaches of Hei river and Shiyang river was significantly higher than Dang river and Shule river.The increase of the artificial oases was mainly because of human exploitation of the nature oases and unused land.The evolution of modern artificial oases has closed relation with the human economic activities and the bearing capacity of the oasis in the Hexi corridor.