不同退化程度的羊草草原群落蒸發(fā)蒸騰特征研究.pdf

1、內(nèi)蒙古大學(xué)碩士學(xué)位論文不同退化程度的羊草草原群落蒸發(fā)蒸騰特征研究姓名：孫鐵軍申請學(xué)位級別：碩士專業(yè)：生態(tài)學(xué)指導(dǎo)教師：樸順姬2001.6.1StudiesofCommunityl王vapotranspirationCharacteristicsontheDifferentDeterioratedDegreesofLeymuschinensisSteppe(Abstract)Waterconsumptioninthesteppecommun

2、ityisimportantonthewaterbalanceofgrasslandecosystemRainfallisthemainfactoroflimitingthesemi—aridtypicalsteppeproductivitybecauseitistheonlywatersource，andsteppecommunityevapotranspirationisoneofthemainfactsonthewaterusee

3、fficiencyAsaresult，thepaperresearchescommunityevapotranspirationandtherelativefactorsonthedeterioratednaturalLeymuschinensissteppeTheresultsarethefollows：Thedominantspeciesofcommunityhavechangedgraduallywithcommunitydete

4、riorationincreasingonthenaturalLeymuschinensissteppeArtemisiafrigidathedominantspeciesofcommunityintheheavydeteriorated，hasmainlychangedintoPotentillaacaulisontheover—deterioratedAndtherelativebiomassofGramineaeplanthasa

5、dominantpositionbeforethemoderate—deteriorated，andthatofCompositaeplantontheheavydeterioratedAndtherelativebiomassofCompositaeplanthasdecreased，andthatofRosaceaeplantincreasingAtthesanletime，therelativebiomassofannualand

6、biennialherbaceousplanthasincreasedandthatofperennialhcrbdecreasingapparentlyOntheotherhand，thesoilhardnessandthesoilwatercontentincreasegraduallyinthedepthof040cmwithcommunitydeteriorationincreasing，andtheyhaveaprominen

7、tcorrelationTheresultofstudyingthesoilevaporationandrelativefactorsis：thesolarradiationplaysadecisiverolebychangingthesoiltemperatureinthesoilevaporation，thencommunitycoverage，soilwatercontentandsoilcapacityetcTheresults