決策樹(shù)在耕地地力等級(jí)評(píng)價(jià)中的應(yīng)用研究.pdf

1、Y1524758分類號(hào)UDC：密級(jí)：——編號(hào)：——決策樹(shù)在耕地地力等級(jí)評(píng)價(jià)中的應(yīng)用研究THEAPPLICATIoNANDSTUDYoFSoILQUALITYGRADEEVALUATIoNBASEDoNDECISl0NTREE學(xué)位授予單位及代碼：量壹堡王盔堂(!Q!豎2學(xué)科專業(yè)名稱及代碼：過(guò)簋扭廛旦堇壟l塑!墊32研究方向：讓簋扭蟹自＆絲劍申請(qǐng)學(xué)位級(jí)別：亟指導(dǎo)教師：崔[莖研究生：萱亟墓論文起止時(shí)間：一2008，ll一200912ABSTR

2、ACTInrecentyears，withpopulationgrowthandrapidsoeioeconomicdevelopment，”P(pán)opulatio瑪resources，food，theenvironment”thestructuralproblemhasbeencausedwidespreadconcernaroundtheworldFertilityofarablelandwillhaveadirectimpactont

3、hesustainabledevelopmentofagricultureandfoodsecuritySoilisthebasisforagriculturalproductionfarmlandisthepeople’SsurvivalandirreplaceablethemostbasicmeansofproductionFarmlandistheessenceoftheland，whichisthemostimportantre

4、sourceforagriculturalproductionAsanimportantevaluationofthequalityofcultivatedlandareas，oneofthefertilityofarableland。StasksisthatmustfindoutacertainareaofcultivatedlandqualityquantityanddistributionofspaceArablelandinfe

5、rtilityevaluationistostrengthenthequalityofcultivatedlandandmakerationaluseoflandanimportantbasisThemajorsignificanceofdoingagoodjobofarablelandfertilityevaluationistocreateconditionsfortherationaluseoflandresources，prev

6、entionoflanddegradationimproveduseofarableland，farmlandprotectionandconstructionqualityfoodsecurityandagriculturalrestructuringTherefore，thisarticleinDehuiCityJilinProvincetoconductapilotsurveyofarablelandfertilityusingd

7、ataminingtechnologyselectsSQLServer2000，JavaandExcelasadevelopmenttool，toachieveagripontheinvestigationandassessmentofarableland，providesasmoothtechnologyfortheconstructionofthegriplevels，edit，queryretrieveandupdate，andh

8、asmadesomeprogressThroughtheuseoftraditionalsoilsurveymethodologyanddataminingtechnologyfromDehuiCityJilinProvinceplansgrouperdatasource20randomlyselectedrecordsGradestogriptheobject，fromorganicmatternitrogen，phosphorus，

9、andpotassiumtoanalyzetheproblemofarablelandfertilitylevelsofDehuiCityCommonuseofdataminingintheclassificationalgorithmDecisionTreeAlgorithm，DehuiCityJilinProvinceestablishedagripofarablelandevaluationmodelAndthenapplythi

10、smodelto15，326records打aining，getResultsandgradelevelofanalysisusedbytheclassificationresultswerecomparedFarmlandfertilitylevelsconsistentgradingresultsprovethatthismethodCanbeusedforfarmlandfertilityratingsnlisarticleisu

11、sefultoexplorethegripontheevaluationmethod，nlispaperintheCOurSeofthestudythesoftwareplatformforbuildingsoilfertilitylevelsofarableland，throughtheparametersandresultsoftheoutputofautomationplans，workedoutasetofdataminingt

12、echnologiesfortheuseofarablelandfertilitysurveyandevaluationofthequalityoftheeffectivemethodsofworkandtechnicalprocessesThusgreatlyreducethedigitaleditingoftheworkloadandimproveworkefficiencyKeywords：decisiontreearablela