放牧对克氏针茅stipa krylovii草原植物性状 功能群与生产力的影响

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1、内蒙古大学硕士学位论文灌木以及中生植物功能群多样性，随放牧强度的加大而呈现递增规律。不同放牧强度对草地生产力的影响有较大的差别，过度放牧显著地降低了群落的生产力和物种多样性；同时Shannon．Wiener多样性指数在中牧下最大，随着放牧强度的加大，呈单峰式曲线变化特征，符合“中度干扰”假说。因此，适度放牧是维持草地生态系统平衡，保护草地物种多样性及发展群落生产力的有效管理方式。关键字：克氏针茅草原；叶片性状；功能群；多样性；放牧梯度万方数据内蒙古大学硕士学位论文EFFECTSOFGRAZING

2、oNPLANTTRAITSA．NDFUNCTIONALGROUPSANDPRODUCTIⅥTYINS删置RlZD圪，STEPPEABSTRACTStipakryloviisteppeisimportantecologicaltypeofEurasiatemperateclimateregions．It’Ssignificanttothedevelopmentofthegrasslandecologyscience，forresearchofgrazingonplanttraits，functio

3、nalgroupsandspeciesdiversityinStipakryloviisteppe．Inthispaper,planttraits，plantfunctionalgroups，productivityandspeciesdiversityindifferentgrazinggradientplotsofstipakryloviisteppeinKelulunbasinwerestudied．It’Saimedtoprovidetheoreticalbasisofstudywith

4、grasslandecology．TheplanttraitswithdifferentlifeformhadnosignificantdifferenceinStipakryloviisteppe．Grazingdisturbanceisoneofthewaystoinfluenceonplanttraits，andplantleaftraitsactuallyreflecttheadaptabilityofplantstotheenvironment．However，therelations

5、hipsbetweenplanttraitswerestronglycorrelated．Acrossthegrazinggradient，thephosphoruscontent(LPC)andtheratioofnitrogenandphosphorus(N／P)intheheavygrazingtreatmentweresignificantlydifferentfromthoseinthemoderategrazingandthelightgrazingtreat3万方数据内蒙古大学硕士

6、学位论文ments．Forfunctionalgroupsbytheclassificationoflifeforms，grazingdisturbanceeffectedsignificantlyonLPCandN／Pintheperennialweeds，whichshowedthatperennialweedsweresensitivetograzingtreatments，andplantnutrientutilizationstrategywaschangedbyheavygrazin

7、g．Theperennialforbshadasignificantadvantageinlightandmoderategrazingareasbutannualorbiennialherbhadanobviousadvantageinheavygrazingareasinlifeformfunctionalgroups．PerennialgrasseshadtheabsoluteSUperiorityinlightgrazingareasfromthedistributionofbiomas

8、sperspective．Xerophytehadtheabsolutesuperiorityinallofthelight，moderateandheavygrazingareasinmoistureecologicalfunctionalgroups．Thedistributionofxerophyteisbiggestunderlightgrazingareasfromthedistributionofbiomassperspective．Therearedifferencesbetwee