瑪納斯河流域棉田土壤有機碳含量時空變化的分析.pdf

1、石河子大學碩士學位論文瑪納斯河流域棉田土壤有機碳含量時空變化的分析姓名：柳紅東申請學位級別：碩士專業(yè)：作物栽培學與耕作學指導教師：張鳳華20070601Abstract【Objective】：Higheffectivedevelopmentofoasisagriculturebasedonsoilsustainabledevelopment，SOCnotonlyindicatedN、Pavailablestaleandsoilphysi

2、calproperties，butalsowasallimportantindexoffarmlandsystemstabilizationandsnstainabilityManasfivervalleywasthelargestplantingcottonregionplantingcottonareawas60～70％oftotalarablelandarea(exceptpiedmontplain)singleplantings

3、tnJctureSothisarticleanalyzedthespatialvariationlawofcotlonSOCintheManasRiverValleyandtreadsofSOCindifferentplantingway[Method]：Basedonthedataofthesecondsoilsurveyandsamplingin2005and2006throughlonglocatedexperiments，ahe

4、mativefunction、thesoilparticleandfractalmodel、DNDCmodelthisarticleanalyzedtemporal—spatialvariationofSOCcontentintypicalcottonfieldoftheManasrivervalley[Results]；ThetotalorganiccarbonstockinsoilofManasfivervalleywasI1354

5、65x106～1175306x10ekg，estimatedbyusingtheanalyticaldataofthesecondsoilinvestigationAeaseofShiheziCottonArableSoil，fromsouthtonorth，SOCwasdecreased。organiccarbonstockwasalluvialfanalluvialplaindeltaSimplecorrelationanalysi

6、sindicatedthatthefractaldimensionswassignificantpositivecorrelationwiththecontentsofSOCSoilclaysContentplayedanimponantroleinaccumulationofSOCwiththeincreaseoflatitudeTherewasadecreasingtrendincottonfieldSOCThesametrends

7、wereHU—CandFA—C，TherewasamaximumofHACatedgebeltofalluvialfan，anddecreasedinalluvialplain，thenitwasincreasedindeltaTheHMFAratioandKosshowedincreasingtreadsSOCwasreducedgradualtywithsoilprofiledepthincreased，buttheorganicc

8、arboncompositionscontentwasdifferentintandfo∞sCottonfieldSOTS“hadbeendescendedbeforethe90sbecauseofonlyonefertilizationmethodCottonfieldSOCwasgainedwiththerateofstrawapplicationexpandingafter90’smiddleThecontentofSOCwasi

9、ncreasedincottonfieldduringdifferentcontinuouscroppingyearsinValleyofManasRiverbecauseofCottonstrawapplication，butmostofitwasHUC，TheHA／FAratiowasdecreasedanddeclinedtoJafter8yearscontinuouscroppingTheKoswasdecreasedbefor

10、e9yearscontinuouscropping，andthenincreasedRotationofcotton，silagecomandcouoncanimproveHA／FAandreduceKosDNDCmodelwasvalidatedbyusinglong—termexperimentinManasfivervalleyTherewasahighsimilaritybetweenthesimulatedvaluesandm

11、easuredvaluesTheresultsderivedfromtestedsimulationsfor20yearsshowedthatSOCwasincreasedundertotalor50％cottonstrawapplication，itwasdecreasedundernocottonstrawapplicationat58eCkgofinitialSOCIfinitialSOCwas150#ks，SOCwouldbed

12、ecreasedundernocottonstrawapplication，orincreasedundertotalor500／“cottonstrawapplicationbefore2years，thandecreasedRoTationofcottonandsilageCOil3yearbyyearcanimproveSOC，butitwasinferiortoconlirlnonscroppingcottonPlantings