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1、第28卷第4期生态学报Vo.l28,No.42008年4月ACTAECOLOGICASINICAApr.,2008水盐环境梯度下翅碱蓬(Suaedasalsa)的生态阈值崔保山,贺强,赵欣胜(北京师范大学环境学院环境模拟与污染控制国家重点联合实验室,北京100875)摘要:在对翅碱蓬(Suaedasalsa)生物量、密度、株高、盖度、多度相关性分析的基础上选取了生物量作为翅碱蓬生物指标,利用高斯模型分析了黄河三角洲翅碱蓬种群沿水深、土壤盐分的生态阈值,翅碱蓬最适水深为-0.42m,水深生态阈值区间为[-
2、0192,0.08](m),水深最适生态阈值区间为[-0.67,-0.17](m);最适土壤盐分为12.71g/kg左右,其盐分生态阈值区间为[5117,20.25](g/kg),盐分最适生态阈值区间为[8.94,16.48](g/kg)。通过分析不同实验区的水盐关系及其交互作用,探讨了水盐交互作用对翅碱蓬生长的影响。最后,通过离差平方和聚类分析,将3个实验区69个样地划分为7类。随着水深和盐分的梯度变化,7类样地的翅碱蓬群落呈现明显的演替。关键词:翅碱蓬;生态阈值;高斯模型;黄河三角洲;湿地文章编号:
3、1000-0933(2008)04-1408-11中图分类号:Q941.2,Q948.11文献标识码:AResearchesontheecologicalthresholdsofSuaedasalsatotheenvironmentalgradientsofwatertabledepthandsoilsalinityCUIBao-Shan,HEQiang,ZHAOXin-ShengStateKeyJointLaboratoryofEnvironmentalSimulationandPollutionCo
4、ntrol,SchoolofEnvironment,BeijingNormalUniversity,Beijing100875,ChinaActaEcologicaSinica,2008,28(4):1408~1418.Abstract:Ecologicalwaterrequirementisahotspotinrecentyears.Alotofresearcheshavebeendonetocalculatethequantityofecologicalwaterneededandtoelucida
5、tethemechanismwhyandhowecologicalwaterisrequired.Littlehasbeendoneonthethresholdsofecologicalwaterrequirement.Ecologicalthresholdsofwetlandplantspeciestotheenvironmentalgradientsisoneofthekeyissuestoascertainthethresholdsofwetlandecologicalwaterrequireme
6、nt.YellowRiverDelta,locatedinthemiddleofEast-AsianContinent,isoneofthethreemainestuarinewetlandsinChina.Suaedasalsasaltmarsh,coveredmostforelandsintheYellowRiverDelta,isanmiportanthabitatforthebirdsfromEast-AsiaandfromEast-AsiatoAustralia.Itisalsomiporta
7、nttokeepthenaturalsuccessionofthewetlandeco-system.Inrecentdecades,withtheexploitationofwetlandresourcesandtherushofenvironmentalproblems,thishabitatsuitabletoSuaedasalsaisdegrading.Thepresentpaperwascomposedtoanswerthequestionwhatawatertabledepthdegreea
8、ndwhatasoilsalinitydegreeissuitableforSuaedasalsa.BasedonaextensiveinvestigationonthehabitationofSuaedasalsaintheYellowRiverDelta,wecontrivedthree基金项目:国家自然科学基金资助项目(40571149);国家重点基础研究发展计划资助项目(2006CB403303)收稿日期:2007-01-16;修订
