利用多元统计方法评价两种不同土壤有机碳组分和团聚体稳定性特征.pdf

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1、南方农业学报JoumaIof‰themAgricuIture2015，46(6)：97l一977ISSN2095—119l：CODENNNXAABhttp：，，www．nfhyxb．cnDOI：10．3969，j：issn．2095一1191．2015．6．97lEValuatingcharacteristicsofsoilorgaIliccarbonflractionsandaggI堍atestabiHtyintwodifferentsoilsbymultivariatestatisticalmet

2、hodsYANGHuil”，ZHANGChun—lail一，HUANGFenl，-，XIEYin—cail一，CAOJian—hual，2+(1InstitIlteofKarstGeolo科，CAGⅣGuan鲥KarstDyn砌icsU)omtory，MinistryofIJandandResources，Guilin，GuaIl酾54l(X珥，China；2Intem撕onalResearchCenteronKarst，UNESC0，Guilin，Guan铲i541004，China)A妇ct：【0

3、b．jective】Thepresentstudywasconductedtoscreenindicessensitivetosoilorganiccarbonchangeandrenectingorg柚iccarbonstabilityinoldertopmvidereferencesfordynamicmonitoringa11devaluationofsoilo职aniccarbonstability．【Method】Byselecting11indices，theprincipalcompet

4、entanalysis(PCA)andclusteranalysis(CA)methodswereusedforanalyzingthecharacteristicindicesrepresentingsoilorganiccarbonactivityandaggregatestability0flimestone∞ilinkarstama卸dredsoilinclasoliteareainMaochunvilla胛ofGuilinCitv，China．【Result】There．sultsofPcA

5、andCAshowedthat，elevenindicescouldbedividedint0twogI．oups，onewasrelatedtosoilnutrientandSoilorganiccarbonhction，啦．，soilorganiccarbon，totalnitmgen，totalphosphollls，panicularorganiccarbon，liableorganicc幽n，andrefhctoryorganiccarbon；theotherwasrelatedtosoil

6、aggregatestability，也．，meanweightdiame—ter，geometricmeandiameter，fbctaldimension，biascoemcient，proportionofsoiIagP即gate>0．25mm．AstobotIlofka玛tareaandclasticrockarea，relativelylowero职aniccarboncontentwasfoundinsoils锄plesofdrylandandsoilsub—surface(20一50cm

7、depth)；relativelystablesoil脚璃regatestabilitvofnaturalsoilwasfoundinwoodlandandscrub；tllelowestsoila{§殍_egatestabilit)rwasfoundinsoils砌plesofpaddyfield．The14soils锄plescouldbedividedinto5cate．godes，whereinland—usetypekDl，kD2，kF2，cF2andcSlwereclassifiedint

8、ooneclasswithmode眦elevelofsoilo婿眦iccarboncontent；kP2，cP2，cD2andcDlwereclusteredintooneclasswitht}lelowestsoilo职aniccarboncon．tent；cPl，cFlandkFlwereinoneclaLsswitharelativelyhi小erlevelofsoilorg蛐iccarboncontent．LandusetypekPlandkSl