简介：LandusechangesoccurringinChinaduringthetimeperiodofrapideconomicdevelopmentarelinkedtothedegradationofwaterqualityinstreamsandlakes.ThispaperexaminestheselinkagesintheDianchiLakewatershedinYunnaninsouthwestChinabasedonatwenty-yeardatasetfrom1988to2008.Pearsoncorrelationanalysisandsimplelinearregressionanalysisareemployedtoexploretherelationshipsbetweenlandusechangeandwaterqualityoftwosub-basins,theCaohaiLakebasinandtheWaihaiLakebasin,withintheDianchiLakewatershed.LandusecategoriesmorestronglycorrelatetowaterqualityintheCaohaiLakebasinthanthatintheWaihaiLakebasin.Thedifferentstructureoflandusecategories,spatialdistributionoflandcover,andscalesofbufferzonescouldbethefactorsresultinginthedissimilaritiesbetweenthesetwolakes.TheresearchcanprovidevaluableinsightsforpolicymakersintolandusemanagementinordertocurbfurtherwaterdegradationinDianchiLake.

简介：Tobuildtheartificialforestecosystemisthemajoreco-economicdevelopmentmodelinthewatershedofMiyunReservoir.Itisveryimportanttoevaluatethebenefitsofthoseecosystems.Emergytheoriesareveryhelpfulforustoestablishascience-basedassessmentframework.EmergyevaluationoftheartificialforestecosystemsinthewatershedofMiyunReservoirisusedtoassestherelativevaluesofseveralecologicalfunctions(sometimescalledecosystemservices)andmainecosystemstorages(sometimescallednaturalcapital).Themaindrivingenergies,internalprocessesandstoragesareevaluated.Themainfunctions,includingtranspiration,GPPandinfiltration,areevaluated,whichare609em$/ha/yr,6,245em$/ha/yrand340em$/ha/yrrespectively.Thetotalvaluesofmajorenvironmentalservicesare4,683em$/ha/yrintheartificialforestecosystem.Themainstoragesofnaturalcapitalincludinglivebiomass,soilmoisture,organicmatter,undergroundwaterandlandformareestimated,whichare112,028em$/ha,9em$/ha,40,718em$/ha,34em$/haand6,400,514em$/harespectively.Thelargestvalueislandform,whichaccountsfor97.7%ofthesecalculatedtotalemdollarvalues.Theconceptofreplacementvalueisexploredusingtheemergyvaluesofbothecosystemservicesandnaturalcapital.Thetotalcalculatedreplacementvaluesare302,160em$/ha.

简介：黄家二岔小流域地处中国黄土高原水土流失最严重的黄土丘陵沟壑区，自１９８３年以来，该小流域作为小流域治理和农业发展技术的试验示范基地，开展了一系列小流域治理和农业综合发展技术的试验研究工作．本文主要介绍了黄家二岔小流域不同治理阶段所存在的问题、目标、研究思路、内容、技术措施、成果和经验，以期对处在不同发展时期的我国和其他发展中国家的流域治理工作提供参考和借鉴．

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简介：PhysiographyandsoilinMaeRimwatershed,ChiangMaiProvince,Thailandwereinvestigatedbyusingaerialphotographsandsatelliteimageinconjunctionwithfieldwork,andsoilinfiltrationrateandsoilshearresistanceweremeasuredinfield.ManyfactorsaffectingrunoffwereanalyzedusigtheIntegratedLandandWaterInformaitonSystem(ILWIS).Asaresult,amodeldeterminingfloodhazarwassetup.Threempsincludingrunoffcurvenumbermap,runoffcoefficentmap,andfloodinumdationmapwerecreated,Inaddition,thetimeofconcentrationwaspredicted.