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1 个结果
  • 简介:UsingthemethodsofcombininglandscapeecologywithGISspatialanalysis,thispaperanalysesthedynamicsofthemarshlandscapestuctureoftheSanjingPlaininthepast20years,furthermore,takingFujinCounty,locatedinthenorthoftheplain,asanexample,analyzestheconversionbetweenmarshandotherlandusetypes.ItisshownthatthemarshintheSanjiangPlaindecreasedgreatlyinthepast20years,butthetrendhasbeguntoreverse,Themarshareadecreasedby51.33%from1980to1996,whereasitdecreasedby4.19%from1996to2000.Thefragmentationofthemarshincreased;thenumberofthepatchesincreasedby326from1986to1996,whereasitonlyincreasedby18patchesfrom1996to2000,Itisobviousthatthespeedofpatchesnumberdiminishedandthemarshfragmentationdecreased,whichshowsthatthereclamationofthemarshconvertedfromthefragmentationtothebriminalargeareaofthemarsh.Thereclaimedmarshhasmainlyconvertedtopaddyfieldanddryland.Largeareaofthemarsh.Thereclaimedmarshhasmainlyconvertedtopaddyfiedldanddryland.Large-scalereclamationintheSanjiangPlaininfluencesitsnaturalenvironmentdirectly:theclimateoftheregionturnsfromcoldandwettowarmanddry,whichmakesthemarshbothinthelow-temperaturenorthernpartandinthedeeplystagnanteasternpartsuitableforfurtheragriculturaldevelopment.

  • 标签: 湿地 三江平原 时空分布 沼泽地 地形