Ecological Security Assessment on Ecotypes Zones and Countermeasures of the Ecologic Restoration in Mamas River Basin over the past 30 Years

【摘要】：正There are different Ecological Zones in respect to the geographical area of arid zone river basin, Ecological Security Problem in different Ecological Zones of arid river basin are to be on the rise.Taking Mamas River Basin as an example,this paper developed an Eco-Security Evaluation indicator system for the four Ecological zones of the upper,middle and lower reaches of the river,and carried out evaluations of the Ecological Security from 1976 to 2006 accordingly with the support of GIS and other data.The result shows that,during the past 30 years,the Ecological Security of the mountainous regions in the upper reaches,the oasis agricultural regions in the middle and lower reaches,and the desert regions in the lower reaches partially decreased,especially the oasis agricultural regions in the middle and lower reaches where there was the minimum degree of security,while that in urban regions in the middle reaches increased.The Scological Security problems are becoming apparent in Mamas River Basin.To restore the Ecological Environment in the Manias River Basin,The author reported countermeasures mat we should take water resources reasonably exploited as main handhold and the upper,middle and lower reaches of the River Basin should be comprehensively controlled.