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1、福建林學(xué)院學(xué)報(bào)2014,34(1):2632第34卷第1期JournalofFujianCollegeofForestry2014年1月北京油松人工林凋落物及粗死木質(zhì)殘?bào)w貯量研究陶立超,孟曉清,孫種,劉琪璨(北京林業(yè)大學(xué)林學(xué)院,北京海淀100083)摘要:通過對(duì)北京14塊油松人工林樣地進(jìn)行調(diào)查,估測(cè)了北京地區(qū)的油松人工林地表凋落物和粗死木質(zhì)殘?bào)w(CWD)的量。結(jié)果表明,北京地區(qū)油松人工林凋落物貯量為25.614t·hm,變異系數(shù)為0.112—0.635;CWD貯量為0.213t·hm,變異系數(shù)為0.854—2.449。凋
2、落物貯量主要集中在半一已分解層,其一般占凋落物貯量的60%一80%,其次為未分解層葉,所占比例一般低于30%,而未分解層枝所占比例最小,低于l5%。不同密度等級(jí)的油松林凋落物中養(yǎng)分元素含量均表現(xiàn)出N(53.55kg.hm)>K(31.97kg·hmI2)>P(7.29kg·hm)的規(guī)律,但各元素含量在不同密度林分中大小規(guī)律不完全相同,N元素含量依次為I(2500株-hm)>Ⅱ(2000株·hmI2)>m(1700株-hm),P和K元素含量依次為I>m>li。經(jīng)相關(guān)性分析得,凋落物量與林分平均樹高呈顯著正相關(guān),而CWD貯量
3、與平均胸徑、海拔、坡度均呈顯著負(fù)相關(guān),與林分密度呈顯著正相關(guān)。關(guān)鍵詞:油松人工林;凋落物;粗死木質(zhì)殘?bào)w;生物量中圖分類號(hào):S718.55文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1001—389X(2014)O1—0026一O7StorageoflitterandcoarsewoodydebrisofPinustabulaeformisplantationinBeijingTAOLi—chao,MENGXiao—qing,SUNChong,LIUQi-jing(CollegeofForestry,BeijingForestryUniver
4、sity,Beijing100083,China)Abstract:Bysurveyingthe14plotsofPinustabulaeformisplantationinBeijing,biomassoffloorlitterandcoarsewoodydebrisofP.tabulaeformisplantationwasestimated.ForestlitterbiomassstorageinP.tabulaeformisplantationwas25.614t·hmwithac0effi(ientofvari
5、ati0nchangingfrom0.112to0.635,andcoarsew0odvdebrisbionlassaccountedforonlv0.213t·hm一withacoefieientofvariationvaccingfrom0.854to2.449.Litterbiomassinallplotswasmainlyallocatedinproportionally/completely—decomposedlayer,whichaccountedforfrom60%to80%,followedbythef
6、oliageinundecomposedlayerwithapercentofsmallerthan30%andbranchesinundeeomposedlayerlowerthan15%.NutrientelementsoflitterinP.tabulaeformisplantationwithdifferentdensitywereN(53.55kg·hm),K(31.97kg·hm)andP(7.29kg.hm)inthesize—downorderofthecontentsofthem.However,eac
7、hnutrientelementcontentshoweddifferentlawintheforestswithdifferentdensityclasses,Ncontentofstand(tensitvfollowedtheorderofI(2500trees.hm一),1I(2000trees.hm)andm(1700trees·hm一),whilebothKandPcontentfollowedbytheorderI>IlI>lI.Floorlitterbiomasswassignificantlypositi
8、velycorrelatedwithonlyaverageheight,whilecoarsewoodydebrisbiomasshadnegativecorrelationwithaveragediameter,elevationandpositivecorrelationwithstanddensity.Keyw