36545.塔克拉瑪干沙漠北緣荒漠河岸植物群落對(duì)水分和氮素輸入的響應(yīng)

1、中國(guó)科學(xué)院新疆生態(tài)與地理研究所博士學(xué)位論文塔克拉瑪干沙漠北緣荒漠河岸植物群落對(duì)水分和氮素輸入的響應(yīng)姓名：李寧申請(qǐng)學(xué)位級(jí)別：博士專(zhuān)業(yè)：生態(tài)學(xué)指導(dǎo)教師：田長(zhǎng)彥馮固20080601摘要IIlTheresponseoftheplantcommunitytothewaterandnitrogeninputtinginthedesertriverbankatthenorthedgeofTaklimakanDesertLINing(ecology)D

2、irectedbyprofTIANChangyanandFENGGuAbstractInordertounderstandtheinfluencestOthedesertecosyStemplantcommunitycharacteristicsandthemechanismofthedesertecosystemstabilityofthesaltwaterandnitrogeninputtingwhichcomefromtheinc

3、reasingsubsidence，theexperimentswerecarriedoutintheriverbankatthenorthedgeofTaklimakanDesertsfrom2004to2005Theinfluencesofdifferentlevelwaterandnitrogeninputtingwereresearchedthoroughly，includingthesoilcharacteristics，th

4、ecommunitycharacteristicsofovergroundvegetation，soilseedbankandtheinterrelationshipbetweentheseedbankandtheovergroundvegetation，whichcouldprovidethetheorybasisforthecontributionsofmoisturecontentandnitrogenandthecorrelat

5、ionmechanismoftheminthecourseofvegetationrecoverywiththeriverTheresultsweresummedupasthefollowing：Theinputofwaterandnitrogenimprovedthesoilnutrientcontent，moisturecontent，reducedthepHsignificantlyTheinputofsaltwaterbroug

6、htthefluctuatedchangeofsurfacesoilsaltcontentandthesaltcontentincreaseofthewholesoilWaterandnitrogenaffectedtheplantcommunitydensityandthestructuralcompositionsignificantlyThedensityincreasedsignificantlyalongwiththeincr

7、easingofwaterinputting，butthesensitivitiesofdifferentspeciesrespondingtOthewaterandnitrogenweredifferentTheplantcommunitycoverageandNPPincreasedalongwittltheincreasingofwaterandnitrogeninputtingWaterandnitrogenchangethes