內(nèi)蒙古多倫典型草原物種多樣性與生產(chǎn)力關(guān)系對降水變化的響應(yīng).pdf

1、甘肅農(nóng)業(yè)大學(xué)碩士學(xué)位論文內(nèi)蒙古多倫典型草原物種多樣性與生產(chǎn)力關(guān)系對降水變化的響應(yīng)姓名：李德鋒申請學(xué)位級別：碩士專業(yè)：草業(yè)科學(xué)指導(dǎo)教師：胡自治王國宏20050601SummaryTherelationshipbetweenproductivityofecosystemandbiodiversitywasstudiedunderthechangeofprecipitationTheexperimentswerecarriedoutinthe

2、DuolunrestorationecologicalstationofIBCAS，thegrasslandofwhichbelongstotheInnerMongoliatypicalgrasslandThreeprecipitationgrades(150％precipitation，100％precipitation，and50％precipitation)weresimulatedthroughmanualcontrol，und

3、erwhichfivebiodiversitylevel(1，2，4，8，14)weresetupAndthespeciesweresampledbyunequalprobabilitiesMeasurethebiomassesTheresultsobtainedareasfollow：1，Undertheconditionof50％precipitation，thecurveoftheequmionwhichexpresstherel

4、ationshipbetweenproductivityofecosystemandbiodiversityisU—shaped，butitstrendisambiguousTheproductivitydecreasewiththeincreaseofnumberofspecies，butitwasincreasedwhenthespecies’numberWast4Undertheconditionof100％precipitati

5、onand150％precipitation，thecurveoftheequationisUshapedtoo2TheprecipitationhasamajorinfluenceontherelationshipbetweenbiodiversityandproductivityAstheprecipitationincreasesthepaRemofrelationshipbetweenbiodiversityandproduct

6、ivityturntovisibleUshapedfromnegativecorrelationTheproductivityincreasequicklyaswaterconditionimprovedwhenthespecies’numberis143TherelationshipbetweenproductivityandsoilnutrientisnegativeTheproductivityincreaseswiththede

7、creaseofsoilnutrientThesoilnutrientisinfluencedmainlybyconsumeofplantgrowthTheabovegroundbiomassandtheconsumptionofnutrienthavethesametrendHigherabovegroundbiomassmeansmoresoilnutrientsconsumption，SOCcontentandNcontentof

8、soildecreaseaccordingly4Atthesanaeprecipitation，thelowerspecieshavestrongersamplingeffect，andthehigherspecieshavestrongercomplementingeffectSamplingeffectandcomplementingeffectareequivalentwhenthenumberofspeciesismoderat

9、eComplementingeffectenhancewiththeincreaseofprecipitation，whichisobviousespeciallywhenthenumberofspeciesishigherKeywords：InnerMongolia；Duolun；Steppe；Biodiversity；Speciesdiversity；Productivity；Ecosystemfunction；Precipitat