Pore Size Distribution as a Soil Physical Quality Index for Agricultural and Pasture Soils in Northeastern Iran-中国期刊网

摘要 Assessmentofsoilqualityisimportantforoptimumproductionandnaturalresourcesconservation.AgriculturalandpasturesoilqualitiesofDeh-SorkhregionlocatedatsouthofMashhad,northeasternIranwereassessedusingtheintegratedqualityindex(IQI)andNemeroqualityindex(NQI)modelsincombinationwithtwodatasets,i.e.,totaldataset(TDS)andminimumdataset(MDS).Inthisstudy6soilpropertiesconsideredasMDSwereselectedoutof18propertiesasTDSusingprinciplecomponentanalysis.Soilsamplesweredividedinto3groupsbasedonoptimumrangesof8soilphysicalqualityindicators.Soilsampleswiththemostindicatorsatoptimumrangewereselectedasgroup1andthesampleshavingfewerindicatorsatoptimumrangewerelocatedingroups2and3.Optimumrangesofsoilporesizedistributionfunctionswerealsodeterminedassoilphysicalqualityindicesbasedon8soilphysicalqualityindicators.Poresizedistributioncurvesofgroup1wereconsideredastheoptimumporesizefunctions.Theresultsshowedthatrelativelyhighorganiccarboncontentscouldimproveporesizedistribution.Meancomparisonsofsoilphysicalqualityindicatorsdemonstratedthatmeanweightdiameterofwetaggregates,structuralstabilityindex,theslopeofmoistureretentioncurveatinflectionpoint,andplantavailablewatercontentinagriculturallandusedecreasedsignificantlyinrelationtopasturelanduse.Inaddition,theresultsdemonstratedthatthestudiedMDScouldbeasuitablerepresentativeofTDS.78%ofpasturesoilshadtheoptimumporesizedistributionfunctions,whilethisparameterforagriculturalsoilswasonly13%.Ingeneral,thesoilsofthestudiedregionshowedhighlimitationsforplantgrowthaccordingtothestudiedindicators.

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Pore Size Distribution as a Soil Physical Quality Index for Agricultural and Pasture Soils in Northeastern Iran

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Pore Size Distribution as a Soil Physical Quality Index for Agricultural and Pasture Soils in Northeastern Iran

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