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草业学报  2014 

胶州湾河口湿地土壤有机碳及氮含量空间分布特征研究

DOI: 10.11686/cyxb20140607, PP. 54-60

Keywords: 胶州湾湿地,TOC,TN,N-N,N-N,分布特征

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Abstract:

为了了解胶州湾河口湿地土壤碳氮的空间分布特征,2011年11月对该区域土壤有机碳(TOC)、总氮(TN)、硝态氮(NO3--N)、铵态氮(NH4+-N)、总磷(TP)以及pH、盐度、含水量进行了测定与分析。结果表明,1)胶州湾河口湿地TOC、TN、NO3--N、NH4+-N以及TP含量分布总体随深度增加而下降,除TOC(P=0.022)外,TN、NO3--N、NH4+-N、TP含量的剖面差异极显著(P<0.01)。碱蓬湿地和芦苇湿地中,NH4+-N的垂直变异系数均大于NO3--N;2)胶州湾河口湿地土壤中氮的主要存在形式为有机氮。芦苇湿地表层土壤中TOC含量高于碱蓬湿地,而碱蓬湿地TN、TP含量高于芦苇湿地;3)胶州湾河口湿地土壤中TN、TP与TOC极显著相关(P<0.01),淹水对NO3--N、NH4+-N的产生和迁移均产生一定程度的影响;4)与其他滨海湿地生态系统对比,胶州湾湿地土壤中营养元素含量较为丰富,TOC、TN、NO3--N以及NH4+-N均处于较高水平。陆源是胶州湾河口湿地有机质的主要来源,且湿地中有机碳腐殖化程度较高。

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