基于rs与gis的金川河流域生态系统健康评价

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1、developed．3Usingecosysteminformationdatabase，thispaperevaluatedthesituationofecosystemhealthofJinchuanRiverBasinin2006，analyzedthespatialpattemandtypicaltownshipforthebasin．wideecosystemhealth．Tlleresultsoftheanalysisare嬲follows：①tllethresholdofJinchuanRiverBasinecosyste

2、mhealthiSdistributedbetween1．48and7．98．TheregionthatiSrelativelygoodaccountedfor7．0％，23．3％relativelygeneral，31．3％relativelypoor，38．4％verypoor，andnorelativelyexcellentregion．Inadditiontoscoreof2．75and2．96thatappearshigherfrequency，othervaluesaremoreevenlydistributed．nleav

3、eragescoreis4．42．andtheoverallsituationisworse．②Fromtherunof!fareaoftheupperreachestothedissipationareaofthemiddlereachesandthentotherunofflostareaofthelowerreaches．scoresarebasicallyaladderdescending．Inthemountainrunoffoftheupperreaches，theconditionsaregoodfornaturalres

4、ourceswhichincludemainlywoodland，highgrasscover，lowpopulationdensity，lCSShumaninterference．ThesystemhasgreaterflexibilityandthesituationoftheecosystemhealthiSrelmivelygood．Restrictedbynaturalresources，theoasisofthedissipationareaofthemiddlereachesincludesmainlydrylandwit

5、hahigherpopulmiondensity．111eoasismarginallanddegradesobviouslybyhumanactivities．ThecurrentsystemiSstillstable．playingthebasicecologicalfunctionsofoasis，andCanmaintainasustainabledevelopment．Desertareawhichmainlyincludesbareland，Gobi。sandandartificialoasisisalsowaterlOSS

6、area．Barelands，deserts，sandareasaregreatlyrestrictedbytheconditionsofnaturalresources．nlestructureoflanduseissingle．theflexibilityofthesystemisverylOW)andthesituationoftheecosystemhealthisverypoor．ArtificialoasisWasobviouslyinterferedbyhumanactivities，thesystem’Sstructur

7、eisirrationalwithanappearanceofecologicalexceptionandpoorecosystemhealth．③Asthetypicalrepresentativeofmountain，mountain·oasis，oasis，oasis—desert，desertarea,thispapermadeacomparativeanalysisamongtownshipofHuangcheng，Xinchengzi，Hongshanyao，Dongzhai，Hongshagangandfoundtheir

8、ecosystemhealtharegraduallydeteriorated．Shuangwanontheartificialoasisofdesertareawasbadlyinterferedbyhu