基于InVEST模型的三江源区生态系统水源供给服务时空变化.pdf

应用生态学报年月第卷第期摇20131摇24摇1摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇摇24ChineseJournalofAppliedEcology,Jan.2013,(1):183-189基于InVEST模型的三江源区生态系统水源供给服务时空变化*潘韬**吴绍洪戴尔阜刘玉洁中摇国科学院地摇理科学与资源摇研究所北京摇(,100101)摘要三江源是我国最大的水源供给和涵养生态功能区近年来,受多种驱动因素的影响,摇摇.三江源区生态系统退化严重,水源供给能力受到一定影响本文探讨了—年三江源.19812010区降水和径流系数的变化规律,基于模型定量估算了—年三江源区生态系InVEST19802005统的水源供给量,分析了不同时期水源供给量的时空变化特征及其成因结果表明:—.1981年,三江源区的降水量整体呈先降低后增加的趋势,降水径流系数的递减趋势比较显著,2010表明区域地表产流能力下降;潜在蒸散发有减少趋势,但并不明显,其变化趋势为-0.226·-1—年,三江源区水源供给量整体呈下降趋势,且黄河源区的下降趋势最明mma.19802005显三江源区水源供给量的时空变化是气候变化和土地利用共同作用的结果,气候因子主要.通过改变降水和潜在蒸散来影响水源供给量;气候变化和土地利用导致的生态系统退化及下垫面改变可能是三江源区水源供给量下降的主要驱动力.关键词生态系统服务水源供给模型三江源区摇摇摇InVEST摇文章编号中图分类号文献标识码摇1001-9332(2013)01-0183-07摇摇P935;Q149摇摇ASpatiotemporalvariationofwatersourcesupplyserviceinThreeRiversSourceAreaofChi鄄nabasedonInVESTmodel.InstituteofGe鄄PANTao,WUShao鄄hong,DAIEr鄄fu,LIUYu鄄jie(ographicSciencesandNaturalResourcesResearchChineseAcademyofSciencesBeijing,,100101,China.鄄Chin.J.Appl.Ecol24).,2013,(1):183-189.Abstract:TheThreeRiversSourceAreaisthelargestecologicalfunctionregionofwatersourcesupplyandconservationinChina.Asaffectedbyavarietyofdrivingfactors,theecosystemsinthisregionareseriouslydegraded,givingdefiniteimpactsonthewatersourcesupplyservice.Thispa鄄perapproachedthevariationpatternsofprecipitationandrunoffcoefficientfrom1981to2010,quantitativelyestimatedthewatersourcesupplyoftheecosystemsintheregionfrom1980to2005basedonInVESTmodel,andanalyzedthespatiotemporalvariationpatternanditscausesofthewa鄄tersourcesupplyindifferentperiods.In1981-2010,theprecipitationintheThreeRiversSourceAreahadatrendofincreaseafteraninitialdecrease,whiletheprecipitationrunoffcoefficientpres鄄entedanobviousdecreasingtrend,suggestingareducedcapabilityofrunoffwatersourcesupplyofthisregion.Thepotentialevapotranspirationhadadecliningtrend,butnotobvious,witharateof-1-0.226mm·a.In1980-2005,thewatersourcesupplyoftheregionrepresentedanoverallde鄄creasingtrend,whichwasmostobviousintheYellowRiverSourceArea.Thespatiotemporalvaria鄄tionofthewatersourcesupplyintheThreeRiversSo