Study On Ecosystem Stability Evaluation In Guazhou Oasis

According to study,in recent decades,Global eco-environment has been coming forth a deteriorism tendency.Human existence and development is being threaten by eco-crisis,Such as global change, ozonosphere destroying, acid rain,water pollution,soil degeneration,global forest crisis,biologic diversity decreasing, toxicant pollution and cross the boundary illegally etc.The government in all the word has had a new cognition about the importance of protecting environment for solving the practical and potential problem of environment to assort with the relation of human and environment.Therefore,the study on environment has been a current hotspot quickly.Our national economy has a quick tempo from reformation and opening,but biology destroying and environment pollution is very serious.Currently,the government has put forward a thought of scientific development and constructing harmonious society.The thought provide a good social atmosphere and policy sustaining.The arid area is large in the northwest of china.The oasis is the most important location of people in the arid area for survival.But the problem of biology is serious,such as river shortening,lake shrinking or drying up,water becoming salty and pollution being more serious,land degeneration,soil salinization,farmland pollution,pest spreading etc.In the face of such austere fact,it is a new research task that how to use a new angle of view to scan oasis and know function of oasis.Guazhou Oasis is located at the western end of HexiCorridor,It has come into being by Shule River.It has a long history,Oasis Agriculture is developed.But lately,with population increasing,the exploitation of water and soil is excessive,The problem of biology is appearing,such as land degeneration,soil salinization,meadow degeneration,etc.For opening out the mechanism of biology degeneration to provide scientific basis of resumptive construct of biology.This paper design a assessment index system of ecological stability in Guazhou Oasis based on the P-S-R mode. The indexes are selected from three aspects which include the ecological quality,ecological pressure and socio-economy status.Entropy method is used to determine the weight of index system.Utilizing Fuzzy Comprehensive Evaluation Model to calculate the comprehensive values.The result shows that the ecosystem in Guazhou Oasis is potentially unstable.The comprehensive values are between 0.33 and 0.63,Average is 0.49.And the trend is from potential unstability to unstability. Analysis points out that this result is due to climate extreme drought ,irrationality use of water resourse and a great deal migration.Finally,the defense countermeasures of ecological risk are presented.