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INTRODUCTIONCoveringabout2.18millionkmZor22.7%ofChinaslandterritory,redsoilresources(RSR)areextremelyimportantfortheregionofSouthChina,wherethereareadiversityofsoilswith58.7%(1.28millionkm)ofthembeingcategorizedtoredsoils(RS)(Huetal.,1999).Withboun