%0 Journal Article
%T 氮磷配施对藏北退化高寒草甸群落结构和生产力的影响
%A 宗宁
%A 石培礼**
%A 牛犇
%A 蒋婧
%A 宋明华
%A 张宪洲
%A 何永涛
%J 应用生态学报
%P 3458-3468
%D 2014
%X fertilizationisaneffectivemanagementmeasureforrecoveryofdegradedgrasslands.tobetterunderstandtheeffectsoffertilizationoncommunitystructureandproductivityoflightlyandseverelydegradedalpinemeadows,weconductedafertilizationexperimentinnortherntibetsince2008.thetreatmentswereadditionofnitrogen(n)alone(50kgn·hm-2·a-1,ln;100kgn·hm-2·a-1,hn)oradditionofbothphosphorus(p)andn(50kgn·hm-2·a-1+50kgp·hm-2·a-1,ln+p;100kgn·hm-2·a-1+50kgp·hm-2·a-1,hn+p)ineachofthetwotypesofdegradedalpinemeadows.nadditionalonesignificantlyaffectedplantcommunityco-verageorproductivityinneithertheslightlynortheseverelydegradedalpinemeadow,whileadditionofbothnandpsignificantlyincreasedplantcommunitycoverage,abovegroundandbelowgroundbiomassofthealpinemeadows.thissuggestedthatproductivityofthisalpinemeadowisco-limitedbynandp.hnandhn+psignificantlydecreasedspeciesrichnessandevennessinthelightlydegradedgrassland,indicatingthathnwasnotbeneficialforthelightlydegradedgrasslandtomaintainspeciesdiversityandcommunitystability.nadditionsignificantlyreducedtheroottoshootratiointheseverelydegradedmeadow.inthelightlydegradedmeadow,nadditionalone,especiallywithahighamount(hn),enhancedtheimportancevalues(iv)andbiomassofgrasses,whilefertilizationwithbothnandpincreasedthoseofsedges.intheseverelydegradedmeadow,fertilizationhadlittleeffectonivofgrassesorsedges,butimprovedbiomassofforbs.theresultssuggestedthatln+pcouldbeemployedinrecoveryoflightlydegradedalpinemeadows,butothermanagementmeasuressuchasfencingandreseedingmaybeneededforrecoveryofseverelydegradedalpinemeadows.
%K nitrogenandphosphorusaddition
%K recoveryofcommunity
%K grasslandimprovement
%K degradedalpinemeadow
%K ？
%K tibetanplateau.
%U http://www.cjae.net/CN/abstract/abstract19830.shtml