民勤荒漠区植被退化动态定位研究3

48.〕

andartificialfactorsandtheirtransferonsandydesertificationoflowerreachesofShiyangriverbasin〔J〕.AridLandGeography,2005,28(2):150-155.〕

〔6〕　张百平.中国干旱区生态战略再思考〔J〕.干旱区研究,2006,

23(3):381-383.〔ZhangBaiping.Reconsiderationabouttheec2ologicalstrategyinaridareasinChina〔J〕.AridZoneResearch,2006,23(3):381-383.〕

〔11〕常兆丰.沙漠人工植被的生态学取向及其途径〔J〕.生态学杂

志,2004,23(3):167-170.〔ChangZaofeng.Ecologicalorienta2

tionandapproachesforestablishmentofartificialvegetationindes2ertareas〔J〕.ChineseJournalofEcology,2004,23(6):167-170.〕

〔7〕　常兆丰,赵明,韩福贵,等.民勤沙区不同稳定性沙丘植被生境

条件研究〔J〕.干旱区研究,2004,21(4):384-388.〔Chang

Zhaofeng,ZhaoMing,HanFugui,etal.Studyonthehabitatsofthevegetationontheduneswiththedifferentstabilitiesinthemin2qinsandyarea〔J〕.AridZoneResearch,2004,21(4):384-388.〕

〔12〕常兆丰.我国防沙治沙科研的突破口初探———以河西走廊沙

区为例〔J〕.干旱区研究,2003,20(1):76-80.〔ChangZha2

ofeng.Preliminarydiscussiononthecreativeapproachofthesci2entificresearchonthesanddriftpreventionandcontrolinChina—AcasestudyintheHexiCorridor,GansuProvince〔J〕.AridZoneResearch,2003,20(1):76-80.〕

〔8〕　赵明,郭志中,王耀琳,等.不同地下水位植物蒸腾耗水特性研

究〔J〕.干旱区研究,2003,20(4):286-291.〔ZhaoMing,Guo

Zhizhong,WangYaolin,etal.Studyonthetranspirationcharac2teristicsof10speciesofplantsunderthedifferentdepthsofgroundwaterlevel〔J〕.AridZoneResearch,2003,20(4):286-291.〕

〔13〕常兆丰,赵明,韩福贵,等.民勤沙区几种荒漠植物的现实生态

位〔J〕.西北植物学报,2006,26(1):165-173.〔ChangZha2

ofeng,ZhaoMing,HanFugui,etal.Realizednichesofseveralere2mophytesindesertcommunitiesofmdesertarea〔J〕.ActaBot(-173.〕

〔9〕　纪永福,贺访印,李亚.民勤绿洲水资源状况与生态建设研究

〔J〕.干旱区研究,2005,22(3):361-366.〔JiYongfu,He

Fangyin,LiYa.Studyonwaterresourcesandecologicalenviron2mentintheMinqinoasis〔J〕.AridZoneResearch,2005,223):361-366.〕

〔14,,,..,(4Duoqing,Liao

al.Characteristicsofnutrientgrowthof

raintermediaindesertareas〔J〕.ActaPrataculturaeSini2

〔10〕常兆丰,.J.,2005,28(2):-155.〔ChangZhongShengnian,etal.Natural

ca,2006,16(4):51-57.〕

StudyontheDynamicVegetationDegenerationintheMinqinDesertArea

ZHANGYing2chang,　CHANGZhao2feng

(MinqinNationalFieldObservation&ResearchStationforDesertRangelandEcosystem,GansuProvinceKeyLaboratoryofDesertificationControl,GansuProvinceInstituteofDesertControlResearch,Wuwei733000,GansuProvince,China)

Abstract:　Nitrariatangutorum,ArtemisiaarenariaandEphedraprzewalskiiarethemainspeciesofnaturalvege2tationintheMinqindesertarea,especiallyHaloxylonammodendronisakeysand2fixationspeciesinthisarea.Inthisstudy,apositionedinvestigationonthedynamicvegetationdegenerationinMinqinwascarriedoutduringtheperiodof2002-2006.Theresultsrevealthatthedesertvegetationiscontinuouslydegenerated,andthevegetationcoverageiscloselyrelatedtoprecipitation.Thereisasignificantpositivecorrelationbetweenthesoilmoisturecon2tentandtheshrubberydensity,herbaceousanddominantspeciesvegetationaswellasthetotalvegetationcoverageinlate2May.RainfallduringtheperiodfromMayandJulyisakeyfactoraffectingthedesertvegetationcoverageandtheplantdensityinthestudyarea.Viewingfromtheaspectofplantcommunities,thecoverageofEphedra

przewalskiiwithdeeprootsandofHaloxylonammodendronwithhighplantsiscomparativelystable.Viewingfrom

theaspectoflandforms,thevegetationonmobileandsemi2fixedsanddunesiscomparativelystable,whereasthevegetationonthefixedsanddunesisseriouslydegenerated.Itiseasytoformsand2surfacecrustandpreventrain2watertoinfiltratedownwardifsandbarriersareconstructed,suchconstruction,however,isdisadvantageousforre2ceivingthelimitedrainfall,soitisnotanidealmeasuretoconstructtheclaysand2barriersforfixingsand.Keywords:　desertvegetation;rainfall;watercontentinthesoil;correlationanalysis;MinqinOasis.

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