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1、第14卷第3期水土保持研究Vol.14No.32007年6月ResearchofSoilandWaterConservationJun.,2007*密云水库北京集水区油松水源保护林主要养分元素积累与分配研究刘世海,白明洲(北京交通大学土木建筑工程学院,北京100044)摘要:对密云水库北京集水区油松水源保护林主要养分元素积累与分配的研究结果表明:29年生油松林的生物2量为92627kg/hm。油松林不同器官中各养分元素的含量差异较大,在叶、枝和干中各养分元素的含量顺序分别为N(K)>K(N、Ca)>Ca(K)>Mg(P)>P(Mg)。根系中的养分元素随着根系直径的增加呈各养分元素的含
2、量降2低。油松林生态系统5种养分元素的贮存量为695.17kg/hm。若以各养分元素在油松林生态系统中的贮存量来计,则N的贮存量最大,P的最小,不同养分元素贮存量的顺序N>Ca>K>Mg>P。油松林生态系统对N元素的富集能力最强,不同器官中各养分元素的富集系数排序均为N>P>K>Ca>Mg。油松林每积累1t干物质需N、P、K、Ca和Mg等5种养分元素共计7.51kg。关键词:密云水库北京集水区;油松水源保护林;养分元素;积累与分配中图分类号:S727.21;718.43文献标识码:A文章编号:1005-3409(2007)03-0326-04NutrientDistributiona
3、ndAccumulationPatternofPinustabuleaformisWaterResourcesProtectionForestinMiyunReservoirWatershed,BeijingLIUSh-ihai,BAIMing-zhou(CollegeofCivilEngineeringandArchitecture,BeijingJiaotongUniversity,Beijing100044,China)Abstract:PinustabulaeformisisthemainlyafforestedtreeintheHuabeidistrict,itmainly
4、distributedinthehillyarea.ThethePinustabulaeformiswaterresourcesprotection,forestecosystem,nutrientaccumulationanddistributionpatternarestud-iedintheupperwatershedofMiyunreservoir,northBeijingmountainarea.ItsresultsshowthatthetotalbiomassofthePinustabulaeformisforestecosysteminthestandis92627kg
5、/hm2.Thenutrientelementsnitrogen(N),phosphors(P),potassium(K),calcium(Ca)andmagnesium(Mg)concentrationareanalyzedinthedifferentorgansofPinustabulaeformisforesteco-system.Thefivekindnutrientscontentintheleavesshowthatsequencesasfollows:N>K(Ca)>Ca(K)>Mg>P,inbranchesshowthatthesequenceasfollows:N>
6、K>Ca>Mg>P,intruckshowsthatthesequenceasfollows:K>N>Ca>Mg>P,andinthedifferentdiameteroftheroot,theN,P,K,CaandMgcontentshowthattheconcentrationbecome2smalleraccompaniedwiththerootdiameterincreased.Thetotalstoreis695.17kg/hmofthefivekindnutrientelementsinthePinustabulaeformisforestecosystem.Ifsumu
7、pthenutrientamountaccordingthedifferentnutrientelement,thenthenutrient22elementsN,P,K,CaandMgstoreinthePinustabulaeformisforestecosystemis270.61kg/hm,34.22kg/hm,157.24kg/hm2,184.32kg/hm2and48.77kg/hm2,respectively.Thesequenceofnut
