2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、UniversityCode：102芝5RegisterCode：09493DissertationfortheDegreeofMasterEFFECToFHARVESTANDLANDUSESONSOILLABILEORGANICCARBONINNATURALSECONDGRoWTHoFNORTHEASTCHINACandidate：Supervisor：AcademicDegreeAppliedfor：Speciality：Dateo

2、fOralExamination：University：LiYunhongProfZhangYandongMasterSilvicultureJune2009NortheastForestryUniversity萬方數(shù)據(jù)AbstractReponsesofsoillabileorganiccarbontodifferentharvestmethodsandlanduseparenasaftercuttingweremeasuredinM

3、aoershanExperimentalForestFarmofnortheastforestryuniversitySecondshawgrowthwaschosentobeprocessedinfourdifferentcuttingsAfteragrowingseasonchangesofsoillabileorganiccarbonweremeasuredMeanwhile，secondgrowth，20。yearlarchfo

4、rest(Lar／xgmelinii)plantedaftercutting(plantation)，and20yearreclaimedcropland(cropland)werechosenascomparisonmeasurement，nleresultsshowed：Afteragrowingseason，thepotentialmineralizationrateandcumulativemineralizedamountof

5、soilorganiccarbon(SOC)fromdifferentplotsrangeasfollow：partialcutI(50％ofthestandvolumeremoved)，cropland(farmingafterclearcutting)，partialcutII(25％ofthestandvolumeremoved)，control(uncut)，afforestation(forestationafterclear

6、cutting)Therearenosignificantdifferencesamongdifferentharvestmethods111eamountofsoilreadilvoxidationcarbon(goc)ofpartialcutIinallthethreesoilhorizonsissignificantlyhigherthancontr01111eamountofsoilmicrobialbiomasscarbon(

7、MBC)ofpartialcutIinmeO10cmand1020cmsoilhorizonsissignificantlyhigherthancontrol；intheO10cmsoilhorizontheamountofMBCofafforestationissignificantlylowerthancontr01Theamountofwatersolubleorganiccarbon(wsoc)ofpartialcutIinth

8、e010鋤and10—20cmsoilhorizonsissignificantlyhigherthancontrol，inthe2030ansoilhorizon，theamountofWSOCofafforestationissignificantlylowerthancontr01Thepercentageofallformsoflabileorganiccarboninsoilorganiccarbonrangeshighest

9、inpartialcutI，andlowestinafrorestationThepotentialmineralizationrateandcumulativemineralizedamountofSOCfromsecondgrowth，plantationandcroplandrangeasfollow：secondgrowthplantationcroplandinⅡ1eO10cnlsoilhorizonsecondgrowth，

10、cropland，plantationinme1O20ClTIsoilhorizonandsecondgrowth，plantation，croplandinthe20—30clnsoilhorizonTherearenosignificantdifferencesamongdifferentlandusesinallthreesoilhorizonsTheamountofROCofsecondgrowthino10cmsoilhori

11、zonissignificantlyhigherthanplantationandcropland111eamountofMBCofsecondgrowthinO一10cnlsoilhorizonissignificantlyhigherthanplantationandcropland，andtheplantationissignificantlyhigherthancroplandtoo，in1020鋤soilhorizon，sec

12、ondgrowthandcroplandaresignificantlyhigherthanplantation111eamountofWSOCofsecondgrowthin010cmsoilhorizonissignificantlyhigherthanplantationandcropland，intlle1O30cmsoilhorizon，secondgrowthishigherthanplantationandcropland

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