毛乌素沙地榆树群落与土壤因子响应关系研究

Study on the Response Relationship Between Ulmus pumila Community and Soil Factors in Maowusu Sandland

榆树作为沙地生态系统的重要组成部分,对维护区域生态稳定性具有至关重要的作用。研究榆树群落物种组成和土壤理化性质,可以为沙地榆树疏林和生态系统的保护提供理论依据。该研究以毛乌素沙地榆树群落为研究对象,在乌审旗境内选取了2个样地,分析了榆树群落物种组成和土壤理化性质。结果表明:(1)毛乌素沙地共获得植物38种,隶属于18科34属,其中以禾本科、菊科和豆科为主。(2)毛乌素沙地榆树群土壤粒度以细沙含量为主;所涉及的土壤化学全量指标中全钾含量最高。(3)RDA(冗余分析)排序显示,大多数优势种主要和有机质(P<0.05;贡献率35.5%)有较大的相关性,其次是全钾(贡献率7.1%)、全氮、全磷。

As an important part of sandy land ecosystem,Ulmus pumila plays a vital role in maintaining regional ecological stability.The study of species composition and soil physicochemical properties of Ulmus pumila community can provide theoretical basis for the protection of Ulmus pumila sparse forest and ecosystem in sandy land.In this study,Ulmus pumila community in Maowusu sandland was taken as the research subject,the species composition and soil physicochemical properties of Ulmus pumila community were analyzed in two sample plots in Wushen Prefecture.The results showed as the following three aspects.(1)A total of 38 plant species were obtained from Maowusu sandland,belonging to 18 families and 34 genera,among which Gramineae,Compositae and Legumes were the main ones.(2)The soil grain size of elm group in Maowusu sandland was dominated by fine sand content;The total potassium content was the highest among the total soil chemistry indexes involved.(3)RDA(redundancy analysis)sequencing showed that most dominant species mainly related to organic matter(P<0.05;the contribution rate was 35.5%),followed by total potassium(the contribution rate was 7.1%),total nitrogen and total phosphorush.