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时间:2020-03-05
《黄河三角洲湿地不同植被群落下土壤养分含量特征_丁秋祎.pdf》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、农业环境科学学报2009,28(10):2092-2097JournalofAgro-EnvironmentScience黄河三角洲湿地不同植被群落下土壤养分含量特征丁秋祎,白军红,高海峰,肖蓉,崔保山(北京师范大学环境学院,水环境模拟国家重点实验室,北京100875)摘要:以黄河三角洲潮上带湿地为对象,通过采样、分析,研究了4种典型的植被群落下水盐梯度和土壤养分含量的变化特征。结果显示,沿植物群落演替方向,土壤水分含量无显著差异,土壤盐分呈逐渐降低的趋势,在一定程度上反映了植物群落的不同演替阶
2、段。在这种水盐梯度下,植被群落的变化能够影响土壤养分含量,沿着植被演替方向,全碳与有机质含量随着演替方向呈先逐渐降低后增加的趋势,土壤碳氮比(C/N)在植被演替中期相对较高;全氮含量沿着演替方向呈现增加趋势,硝态氮与铵态氮先增加后降低;全磷与有效磷随演替变化系数较小,演替中期各理化性质变异系数相对较大。各群落土壤C/N值均小于25。相关分析表明,全氮、有机质与有效磷两两显著相关(p<0.01),有效磷还与含水率显著相关(p<0.05),硝态氮、铵态氮和全磷未显示出与其他理化性质的相关关系。含水率
3、与pH值显著相关(p<0.05),且二者均与土壤盐分显著负相关(p<0.01)。关键词:植被群落;湿地土壤;养分含量;黄河三角洲中图分类号:S153.6文献标志码:A文章编号:1672-2043(2009)10-2092-06SoilNutrientContentsinYellowRiverDeltaWetlandswithDifferentPlantCommunitiesDINGQiu-yi,BAIJun-hong,GAOHai-feng,XIAORong,CUIBao-shan(StateK
4、eyLabofWaterEnvironmentSimulation,SchoolofEnvironment,BeijingNormalUniversity,Beijing100875,China)Abstract:Soilnutrientcontentsweremeasuredin31studyplotsofthesupratidalzonewetlandofYellowRiverDelta(YRD)inordertorevealtheirchangesinmarshsoilswithdiffe
5、rentplantcommunities.Bythemethodsofspatialdistributionasasubstitutefortimesuccession,differ-entplantcommunitieswerechosentosubstitutedifferentperiodsofplantcommunitysuccession.Resultsshowedthattherewereobviousrela-tionshipsamongfourplantcommunitiesan
6、dsoilsaltcontents(SC)buttherewerenosignificantdifferencesamongwatercontents(WC),whichalsoshoweddifferentsuccessionperiodsofplantcommunitytosomecertain.Alongthepositivesuccessiondirectionofpantcommuni-ty,boththecontentsofsoilorganicmatter(SOM)andtheir
7、variationcoefficientsshowedthetrendof“decreasingbeforeincreasing”alongthewater-saltgradients.TheratiosofC/Nwererelativelyhigherinthemiddleofthesuccessionsthanatthebeginningorlaterstage.Totalnitro-gen(TN)contentsshowedanincreasewhileNH+-4-NandNO3-Nsho
8、wedthetrendsof“decreasingafterincreasing”.Totalphosphorus(TP)contentshadnosignificantvariationswiththesuccession.Nosignificantdifferenceswereobservedintotalphosphorus(TP)andavailablephosphorus(AP)contentsofwetlandsoilsunderfourplantcommunities.Themid
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