区域水资源植被承载力计算系统开发及其应用

《区域水资源植被承载力计算系统开发及其应用》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、AbstractTherearesevereecologicalenvironmentproblemscoexistingintheloessplateauofChina，suchasdrought，watershortage，lackofvegetationandsoilerosion．Ontheonehand，itisnecessarytOrecoveryforestvegetationassoonaspossibletoalleviatesoilandwatererosion；Ontheother

2、hand，thewateryieldCannotexcessivelydecreasedduetovegetationreforestation．Itisachallengehowtorecoveryandmanagetheforestvegetationandsafeguardregionalwaterproductionfunctionatthesametimeintheloessplateau．Restoretheforestbasedonthevegetationcarryingcapacity

3、ofregionalwaterresourcesisthekeyroadtosolvethisproblem．Inthisthesis，theconceptoftheregionalvegetationcarryingcapacityofwaterresourceswasdefinedandtheindicatorswrergiven．Acalculationsystemforvegetationcarryingcapacityofregionalwaterresourceswasdeveloped．T

4、henitwasemployedtoestimatethevegetationcarryingcapacityofregionalwaterresourcesofJingheupstream．Weaimedatprovidingtechnicalsupportandscientificguidanceforrationalallocationofwaterresourcesandwater-forestmanagementindryareas．Themainresultsareasfollows：1．I

5、mpactofforestvegetationrestorationonrunoffTheafforestationwouldresultinthedecreaseofannualrunoffanddryseasonrunoffintheupperreachesofJingheRiver．Themaximumannualrunoffreductionwas10．75InlTlandthemaximumdryseasonrunoffreductionwas4．27mmafter10％grasslandof

6、thewholeareawasconveredtoforestlandintherockymountainareas，meanwhilethemaximumannualrunoffreductionwas4．94mlnandthemaximumdryseasonrunoffreductionwas1．34mm．theincreasingofleafareaindexwouldcausemoreannualrunoffanddryseasonrunoffreduction．Butwhentheleafar

7、eaindexexceeded2．5，theannualrunoffanddryseasonrunoffwouldreachitsminimumanddecreasednomore．2．TheconceptofvegetationcarryingcapacityofregionalwaterresourcesBasedonthepreviousstudysonwaterresourcescarryingcapacity,landcarryingcapacity,vegetationcarryingcap

8、acityofsoilwater,theconceptofregionalvegetationcarryingcapacityofwaterresourceswasdefinedas‘‘Themaximumvegetationloadsupportedbylandresourcesundertherequirementsofaspecificwateryieldfortheaimofmaintainingtheharmoniousdevel