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1、農(nóng)業(yè)環(huán)境科學(xué)學(xué)報(bào)2009,28(10):2092-2097JournalofAgro-EnvironmentScience黃河三角洲濕地不同植被群落下土壤養(yǎng)分含量特征丁秋祎,白軍紅,高海峰,肖蓉,崔保山(北京師范大學(xué)環(huán)境學(xué)院,水環(huán)境模擬國家重點(diǎn)實(shí)驗(yàn)室,北京100875)摘要:以黃河三角洲潮上帶濕地為對象,通過采樣、分析,研究了4種典型的植被群落下水鹽梯度和土壤養(yǎng)分含量的變化特征。結(jié)果顯示,沿植物群落演替方向,土壤水分含量無顯著差異,土壤鹽分呈逐漸降低的趨勢,在一定程度上反映了植物群落的不同演替階
2、段。在這種水鹽梯度下,植被群落的變化能夠影響土壤養(yǎng)分含量,沿著植被演替方向,全碳與有機(jī)質(zhì)含量隨著演替方向呈先逐漸降低后增加的趨勢,土壤碳氮比(C/N)在植被演替中期相對較高;全氮含量沿著演替方向呈現(xiàn)增加趨勢,硝態(tài)氮與銨態(tài)氮先增加后降低;全磷與有效磷隨演替變化系數(shù)較小,演替中期各理化性質(zhì)變異系數(shù)相對較大。各群落土壤C/N值均小于25。相關(guān)分析表明,全氮、有機(jī)質(zhì)與有效磷兩兩顯著相關(guān)(p<0.01),有效磷還與含水率顯著相關(guān)(p<0.05),硝態(tài)氮、銨態(tài)氮和全磷未顯示出與其他理化性質(zhì)的相關(guān)關(guān)系。含水率
3、與pH值顯著相關(guān)(p<0.05),且二者均與土壤鹽分顯著負(fù)相關(guān)(p<0.01)。關(guān)鍵詞:植被群落;濕地土壤;養(yǎng)分含量;黃河三角洲中圖分類號:S153.6文獻(xiàn)標(biāo)志碼:A文章編號: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