The Ecological Security Assessment Of Mi Yi County Of Ertan Reservoir

With development of human society,science and technology and the social productive forces maximum improve,human is affecting environmental disruption with the unknown scale and intensity,system and being changing natural ecology,the safety causing an ecosystem suffers more and more big damage,and endangers human being sells safety from this.Therefore,the research of ecological security becomes growing in importance.Based on the project of "To dry heat fiver valley,organism's habits geology environment effect and the system safety "held by Sichuan Province youth science and technology foundation project.The southern part studying area is located in Sichuan Province,the east,Hui Li County is adjacent to Liang Shan prefecture in the south,the west receives Yan Bian County,the north links up with Liang Shan prefecture De Chang County,Yan Yuan County,the geographical feature coordinate is east longitude 101°42′～102°15′,north latitude 26°38′～27°11′,is located in the dry heat fiver valley,for more representative high mountain canyon general configuration of the earth's surface,vegetation population structure is simple,kind is less,almost several are annual,destroy because of active jamming,Vegetation coverage rates become lower.Study the area inner encompasses a large population,cause area to there exist inadaptability in environment and economic growth.Adjoint the ecological environment worsens gradually,natural calamities often happens,reach loss of soil and water if sand blown by the wind,is arid waiting,ultimate feasible very bad ecological environment economic growth can not work regularly.The valuation therefore,carrying out organism's habits safety on the person has very important significance. This thesis makes application of P-S-R module and makes a study of assement of ecological safety of dry heat river valley.By taking MiYi county as a reasearch area and using data of LANDSAT of this area,this study makes ecological asessment significant.It's main content is as following:(1)To serve a function based on safe definition of organism's habits in combination with,an ecosystem,have discussed the concept frame that organism's habits safety appraises,have built the index system that Mi Yi county organism's habits safety appraises ultimately according to P-S-R(pressure state responds to) model:Per capita GDP of economy society pressure(P)—per capita total grain output,population density,natural environment state(S)—geology disaster frequencies,slope,loss of soil and water intensity,vegetation cover,traffic lane buffer area classifies,residential area buffer area classifies,the humanity responds to the(R)—natural population growth rate,per-capita amount of farmland,geology disaster monitoring and governs cost.(2)With the general situations of Mi Yi county,Factor having extracted slope, traffic lane buffer area and resident field buffer area at the same time under GIS technology hold out,the disaster having made Mi Yi county geology distributes picture and population density picture taking villages and towns as area.the picture, vegetation making use of remote sensing technique to have abstracted land being covered by the vegetation,being covered with main organism's habits safety factor such as slope and loss of soil and water intensity classification,Mi Yi county land covers quilt cover up with degree picture and hierarchic loss of soil and water intensity picture.(3)Adopting AHP have ascertained every index factor weight and apply according to weight add guess that the model gets safe synthetical Mi Yi county organism's habits picture.State is horizontal according to the safe Mi Yi county organism's habits situation picture,reaching 2003 overall evaluation in as a whole, bearing concern,reaching a grade only namely inⅡ.And the cause of formation being in progress to this safe problem analyses,brings forward a countermeasure,adopt namely including that the safety controlling inclusive Mi Yi county organism's habits such as natural population growth rate,ecological conservation and organism's habits protection regulates and controls measure synthetically,with much better improvement Mi Yi county ecological environment.