植物生长与土壤水关系调控起始期.pdf

29 10 Vo.l29, No.10 2009 10 ACTAECOLOGICASINICA Oc.t, 2009 1, 2, ＊ 1, 2 郭忠升 ,李耀林 (1., , 　7 12 100 2., , 　712 100) :。, , 1 ～5 。:1 a, , 220 cm, 2 , , 。 2004 , 3 100 cm, 4 , 5 。, , 。 : :1000-0933(2009 )10-572 1-09　:Q142, Q948, S152.7　:A Initiationstagetoregulatethecaraganagrowthandsoilwaterinthesemiarid areaofLoessHillyRegion, China 1, 2, ＊ 1, 2 GUOZhong-Sheng , LIYao-Lin 1 InstituteofSoilandWaterConservation, NorthwesternA FUniversit,yYangling7 12 100, China 2 InstituteofSoilandWaterConservation, ChineseAcademyofScienc,eMinistryofwaterresource,sChina, Yangling7 12100, China ActaEcologicaSinica, 2009, 29(10 ):5721 ～5729. Abstrac:tDetermininginitiationstagetoregulatetheplantgrowthandsoilwateristhebaseofsustainableuseofsoilwater resource.sInthispape,rthedynamicsofsoilwaterwerecontinuouslymeasuredwithaneutronprobeinfixedpositionsin thewastelandandnewlysowingCaraganaforestlandduringtheperiodfrom2002 to2006 andthedatameasuredwas analysed.Theresultsshowsthatthedepthplantusesoilwaterincreasesfromthesurfacesoilon24th Juneto220 cminthe firstyea,randthatthedepthplantabsorbandusesoilwaterandsoilwaterconsumptionincrease,sandtheamountofsoil waterstoragereducedwithincreasingageapartfromthewetyearin2003 inwhichtheamountofsoilwaterstorageincreased by122.8 mmatthe2 -year-oldCaraganaforestland.Itisalsodiscoveredthatthesoilwatercontentatthesoillayerof100 cmissmallerthanthewiltingcoefficientinthe3 -year-oldCaraganalandanddriedlayerofsoilbecomemoreandmore seriousin4 -year-oldCaraganalandandtheinitiationstageofregulatingtherelationshipbetweenCaraganagrowthandsoil wateris5 year.sEffectivemeasuresshouldbetakentocontrolplantdensityandgrowthinordertor