额济纳不同龄级胡杨与土壤的水盐关系研究.pdf

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1、分类号S156.4学校代码10129UDC631.4学号08204032额济纳不同龄级胡杨与土壤的水盐关系研究StudytheRelationonWaterandSaltsbetweentheDifferentAgeGroupofPopulusEuphraticeinEgina申请人：程智学科门类：农学学科专业：土壤学研究方向：土地资源利用与改良指导教师：张伟华副教授乌力更教授论文提交日期：二〇一一年五月摘要本文主要研究内蒙古阿拉善盟额济纳旗境内胡杨与其生境的关系，旨在揭示不同树龄胡杨体内盐分与土壤中的盐分的相应关系，为将胡杨引种

2、到半干旱地区改良盐碱地做理论研究工作。试验研究得出：1在荒漠地带，没有植被覆盖的对照土壤pH值明显高于胡杨林地。2在不同龄级的胡杨土壤中，土壤含水量有明显差异。林地土壤含水量高出对照20-200%。不同龄级胡杨林土壤含水量关系为：中龄胡杨>幼龄胡杨>老龄胡杨>对照。3在胡杨林土壤中，主要以氯化物——硫酸盐为主，盐分主要聚集0-30cm土层。4在3个龄级的胡杨林土壤中，盐分含量和渗透压相对应：幼龄胡杨>中龄胡杨>老龄胡杨。5随着胡杨的不断生长，在胡杨体内富集了越来越多的的盐分，不断提高胡杨的渗透压，使胡杨在高盐环境中生存。关键词：土

3、壤溶液浓度；胡杨活体浓度；渗透压StudytheRelationsonWaterandSaltsbetweentheDifferentAgeGroupofPopulusEuphraticeinEginaAbstractStudytherelationshipbetweeneuphraticeandit’sbiotopeisthepurposeofthispaper.P.euphraticeexistinInnerMongoliaAlxaLeagueEjinBanner.Studytherelationonwaterandsalts

4、betweenthedifferentagegroupofP.euphratice，InordertotransplantationP.euphraticetothesemiaridregionamelioratesaline-alkalisoil.Teststudyconcludedinclude:1Indesertterrain,CKsoilpHvaluehigherthantheP.euphraticeforests.2Therehaveobviousdifferencebetweenthedifferentagegroup

5、ofP.euphraticesoilmoisture.P.euphraticeforestssoilwatercontentmorethanCK20-200%.ThesoilmoisturecontentrelationshipofdifferentagegroupP.euphraticeforests:middleageP.euphratice>youngageP.euphratice>oldageP.euphratice>CK.3IntheP.euphraticeforestssoil,concentratedin0-30cm

6、soilprimarilyincludechloride-sulfate.4AmongthethreeagegroupP.euphraticeforestssoil,saltcontentcorrespondingwithosmotic:youngageP.euphratice>middleageP.euphratice>oldageP.euphratice.5WiththeP.euphraticecontinuousgrowth,P.euphraticeaccumulationmoreandmoresalt,P.euphrati

7、cecontinuouslyimproveandosmoticforsurviveinahighsaltenvironment.Keywords:soilsolutionconcentration;PopulusEuphraticeconcentration;osmoticpressureDirectedby:Prof.ZHANGWeihuaApplicantfordegree:CHENGZhi(masterofAgriculture)(CollegeofEcologyandEnvironmentScience,InnerMong

8、oliaAgriculturalUniversity.Huhhot010018,China)目录1引言................................................................11.1背景...