北方農(nóng)牧交錯(cuò)帶保護(hù)性耕作對(duì)農(nóng)田土壤風(fēng)蝕影響效應(yīng)研究.pdf

1、中國農(nóng)業(yè)大學(xué)博士學(xué)位論文北方農(nóng)牧交錯(cuò)帶保護(hù)性耕作對(duì)農(nóng)田土壤風(fēng)蝕影響效應(yīng)研究姓名：秦紅靈申請學(xué)位級(jí)別：博士專業(yè)：作物栽培學(xué)與耕作學(xué)指導(dǎo)教師：高旺盛20070601AbstractConservationtillage(cDisoneofpromisingtechnologytocontrolwinderosionintheagropastomlEftoneofnorthChinaDuingthedefectsthatthepaststud

2、iesonlyfocusedontimecoeconomicanalysisofCTanditsmechanismtocontrolsoilerosionremainedunclearingSointhisstudyIaimedatinvestigatingthesoilwinderosionmechanismandecologicaleffectsfromtheCTfarmlandTheregionofWuchuanCountyofI

3、nnerMongoliaProvinceinthesemiaridregionofnorthwestChinaWaschosenascasestudyandsomeprimaryfactorsinfluencingsoilwinderosionandsoilqualitywerequalitativelyandquantitativelystudiedviawindtunneltestsandfieldexperimentfor4yea

4、rs11”resultsshowedasfollows：(1)Asthenaturalfactorsthewinderosionfiomfarmlandw勰infinoncedsignificantlybystubblecoverageandtopsoilphysicalandchemicalpropertiesTherewereremarkedpositiverelationshipbetweenthewinderosionratea

5、ndstubblecoverage，MightanddensityThecoefficientofstubbleheightwasmosLTherewereremarkedpositiverelationshipbetweenthewinderosionrateandtopsoilmoisturecontenthardnessandroughnessThecoefficientoftopsoilroughnesswasmostandth

6、eregressfunctionwasY=449e∞“(2)Astheartificialfactors，thewinderosionWasinfluencedsignificantlybYthelandI辯，thefashionofplantingandtillageThestarttipspeedofwinderosionwasnotillagefarmland(1258m／s)naturalgrassland(1173m／s)pl

7、oughfarmland(1091m／s)newlybrokengrassland(977m／s)Undertheploughfarmland，thewindvelocityof18m／sandthesoilmoistureof6％werethesignificantpointstoaggravatethewinderosion(3)ThehomorhizieplantwithhiglIdensitywasbesttocontrolwi

8、nderosionunderNTThesoilroughness、ve∞milletforagemaizeforageoatsrapeThewindsprⅨlnearsurfaceandwinderosionratewererapeoatsmaizeforagemilletforage(4)Comparedwithploughtillage(PT)，thewindspeednearsurface，thetopsoilroughnessa

9、ndwinderosionratewerelessThewinderosionrateWas3to82timesor4to12timesunder町thanNTviawindtunnelandfieldexperimentThewinderosioncouldcontrolavailablyunderNT2yearslaterSoilphysicalandchemicalpropertieswmimprovedtocontrolwind

10、erosion3yearslater(5)111ewaterstoragecapac時(shí)andmicrobialbiomasscarbonunderNTwasmolethanPTButthephysicalpropertieswithlowersoiltemperateandhighersoilhardnessdidharmtothecropgrowthunderNT(6)SubsoilingunderNTiseffectiverotat

11、iontillagetocontainedmoresoilmoistureandimprovedwateruseefficiencyinEctoneofnorthChinaInOlOom1020cmand2030cmsubsoilingdecreasedhulkdensityby20，06％，885％and721％whichincreasedtheavailableprecipitationThisdissertationwassupp