杭州西溪湿地生态系统不同群落营养元素的积累及分配特征

The Nutrient Accumulation and Distribution Characteristics of the Different Communities in Xixi Wetland Ecosystem

对西溪湿地生态系统内菰(Zizania latifolia)群落、芦苇(Phragmites australis)群落和人工植物再力花(Thalia dealbata)群落中的土壤营养元素的空间分布、土壤营养元素储量以及三种优势植物营养元素的积累特征进行了初步分析研究。结果表明:人工栽培的再力花群落土壤TOC、TN和铵态氮含量较少,这主要是与土壤含水率有关;三者土壤营养元素垂直分布较为相似;三者植物叶以及穗和地下部分中N、P含量均较高;湿地植物群落(菰群落和芦苇群落)土壤TOC和TN储量比较高,而再力花群落土壤TP储量较高;芦苇积累TOC、TN、TP的含量远远高于其它两种植物;人工栽培的再力花群落水体内各元素含量均高于其它两种湿地植物群落的水体。

The spatial distribution of soil elements and their contents in the three communities Zizania latifolia,community, Phragmites australis community and Thalia dealbata community are analyzed in the paper.The element aggregates in the three dominant plant species are also analyszed in the paper.The results show TN、TOC and ammonium nitrogen content of soil in artificial plant Thalia dealbata is less than the other two communities,this is mainly related with soil moisture content.The vertical distribution of three soil nutrient elements is relatively similar;The N,P content of three plants leaves,spike and underground part are higher;The soil TOC and TN reserves in wetland plant community are quite high,and the TP reserves of artificial plant Thalia dealbata is higher;The accumulated TOC,TN and TP of Phragmites australis are far higher than other two plants;Each element content of water in Artificial Thalia dealbata communitie is higher than the other community waters.