简介:Boththeoreticalandfieldobservationswereexaminedtostudythecloserelationshipbetweensoildegenerationandtheevolutionofgrasslandvegetation.Ageneraln-speciesmodelofequalcompetitionunderdifferentdegreesofsoildegradationwasappliedtofielddatainordertoprobethedynamicprocessesandmechanismsofvegetationevolutionduetotheeffectsofthesoil'secologicaldeteriorationongrasslandvegetation.Comparisonsweremadebetweenthetheoreticalresultsandthepracticalsurveyswithsatisfactoryresults.
简介:Soiltestforavailabilityofnutrientsandheavymetalsisextensivelyservedasameansfortheevaluationsofsoilfertility,andenvironmentaleffectsandphytotoxicityofpollutantsinsoils,andforthefertilizerrecommendationinagriculturalandenvironmentalsciences.Therefore,greatattentionhasbeenpaidtothemeasurementofelementalavailabilityinsoiltest.