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long2termsoilmobialbiomassand

IndicesofEco2GeochemicalCharacteristicsinADegradation2Reclamation

SequenceofSoilsinMountainousKarstArea:ACaseStudyin

Guanling2ZhenfengRegion,Guizhou,China

RenJing2chen,ZhangPing2jiu,PanGen2xing,1

1

1

2

(1.InstituteofResource,EcosystemandEnvironmentofAgriculture,NanjingAgriculturalUniversity,

Nanjing210095,China;2.InstituteofNaturalResourcesandGeographicalSciences,Chinese

AcademyofSciences,Beijing100101,China)

Abstract:Theprocessofsoildegradationinmountainouskarstregionshasbeentheresearchfocusofsoilsci2enceandecologyinChinaforthelastdecade.TakinganexampleofkarstsoilsfromGuanling2Zhengfengarea,southwesternGuizhou,China,changesofsoiltotalandavailablepoolofmajornutrients,microbialbiomasscarbonandsoilrespiration,activitiesofmajorsoilenzymesinadegradation2reclamationsequencewerestudied.Thesoilsofsurface0～5cmandsubsurface5～25cmwerecollectedfromselectedeco2tesserasofdegradedabandonlands,corncultivatedlands,vegetationrecoverylandsandwell2protectedvegetationlandsrespectively.Totalpoolofsoilmajornutrientsshowedsensitivechangeswithvegetationcover,accompanyingasimilarchangeofsoilmicrobialbi2omasscarbon.Vegetationrecoveryresultedinaremarkablechangeofsoiltotalnutrientpoolandincreasedsoilmi2crobialbiomasscarbon.However,vegetationrecoveryfor3～6yearslongdidnotdriveasignificantchangeina2vailablepoolofthenutrientsaswellasthemicrobialrespirationquotientandsoilenzymeactivities.Theresultsim2plicatedthattherecoveryofavailablenutrientpoolandmicrobialfunctioningcouldbeareliableindicatorforeco2systemshealthofthekarstsoilsunderdifferentdegreesoflanddegradationandvegetationrecovery.Itissuggestedthatnotonlytotalnutrientpoolandmicrobialbiomasscarbonbutalsothemicrobialfunctioningindicatorsasmicro2bialrespirationquotient,activitiesofkeysoilenzymesshouldbetakenintoaccountwhileevaluatingtheintensityoflanddegradationand/ortheeffectofvegetationrecoveronsoilqualityandecosystemfunctioningforthekarstlandsinSouthwestChina.

Keywords:Soildegradation;Vegetationrecovery;Soilnutrients;Eco2geochemistry;Karstsoils;Ecologicalassessment;Soilquality.