Annual and Monthly Variations in Litter Macronutrients of Three Subalpine Forests in Western China-中国Betway体育网页登陆

摘要 Macronutrients(N,P,K,Ca,Mg,andS)inlitterofthreeprimarilyspruce(PiceapurpureaMasters)(SF),fir(AbiesfaxonianaRehder&E.H.Wilson)(FF),andbirch(BetulaplatyphyllaSukaczev)(BF)subalpineforestsinwesternChinaweremeasuredtounderstandthemonthlyvariationsinlitternutrientconcentrationsandannualandmonthlynutrientreturnsvialitterfall.NutrientconcentrationinlittershowedtherankorderofCa>N>Mg>K>S>P.Monthlyvariationsinnutrientconcentrationsweregreaterinleaflitter(LL)thanotherlittercomponents.ThehighestandlowestconcentrationsofN,P,K,andSinLLwerefoundinthegrowingseasonandthenongrowingseason,respectively,butCaandMgweretheopposite.NutrientreturnsvialitterfallshowedamarkedmonthlypatternwithamajorpeakinOctoberandoneortwosmallpeaksinFebruaryand/orMay,varyingwiththeelementandstandtype,butnomarkedmonthlyvariationsinnutrientreturnsviawoodylitter,reproductivelitter,exceptinMayfortheBF,andmosslitter.Notonlylitterproductionbutalsonutrientconcentrationcontrolledtheannualnutrientreturnandthemonthlynutrientreturnpattern.Themonthlypatternsofthenutrientconcentrationandreturnwereofecologicalimportancefornutrientcyclingandplantgrowthinthesubalpineforestecosystems.

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Annual and Monthly Variations in Litter Macronutrients of Three Subalpine Forests in Western China

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