GIS支持下的龍海市農(nóng)用地分等研究.pdf

1、福建農(nóng)林大學碩士學位論文GIS支持下的龍海市農(nóng)用地分等研究姓名：范勝龍申請學位級別：碩士專業(yè)：土壤學指導教師：黃炎和2002.5.1塑壟查蔓查蘭堡主蘭垡堡塞————!塑之蘭一ABSTRACTAccordingtoProceduresandRulesforFarmlandGradingandRegulations加rTechnologicalOperationsofFarraland(CultivatedLand)GradingofFuj

2、ianProvinceThepapermadeallcomprehensiveanddeepinvestigationonLon#J融city’Sfarmlandandthenselected110sampleplotstocontinuefollowingresearchTheresearchobtainedthefirsthanddataoffarmlandgradingfactorsand血encomparedthemwithth

3、edatagettingfromtheSecondNationalLandSurvey(1978)ByusingthesoftwareARCklNFOandARCWEWthepapergradedthefarmlandaccordingtotwosetsofdatarespectivelyThispapertriestoexplorethefeasibilityofusingthedamoftheSecondNationalLandSu

4、rveytothecurrentresearchbycomparingandanalyzingtwosetsofgradingresults，Theinvestigationshowsthatthoughpast20years，theorganicmattercontentdrainageconditionandthethicknessofcultivationhorizonofLonghai啦’Sfarmlandhavechanged

5、obviouslyHoweveritstopsoiltexturesoilprofilestructure，irrigationassurancc，thicknessofsoilhorizon(dryland)，elevation，slopedegreeandsoilerosiondegreechangedwithinasmallextentGradingresultsshowsthatthegradingresultbythedata

6、oftheSecondNationalLandSurveydiffersgreatlyfromthatofthecurrentresearchdataIfonlytheorganicmattercontentorthethicknessofcultivationhorizonusingthedataoftheSecondNationalLandSurveyandthecurrentresearchdatathegradingresult

7、hasgreatlydifferenceIfgradinglandbasedononlytopsoiltexturefactorusingthedataoftheSecondNafionalLandSurveyandthecurrentresearchdatathedifferencesofthetwogradingresultscouldberegardedasreasonableelroronlyifwesetgradinginte

8、rvalon200Whengradingbyonlythefactorasirrigationassurance，drainageconditionorsoilprofilestructureusingthedataoftheSecondNationalLaudSurveyandthecurrentresearchdatatomakethedifferenceswithintheextentofreasonableerror，thegr