银川平原草甸湿地表层土盐分累积特征

发布时间：2018-01-14 10:04

  本文关键词：银川平原草甸湿地表层土盐分累积特征　出处：《农业工程学报》2016年05期 　论文类型：期刊论文

  更多相关文章： 盐分 湿地 土壤 银川平原

【摘要】：银川平原湿地属于典型的绿洲湿地,不仅是生物多样性的载体,还有具有重要的环境调节功能及较高的生产力,但由于其地处于易发生盐分累积的区域,因此,找出银川平原草甸湿地土壤盐分的空间累积特征,对了解银川平原水盐迁移过程对湿地生态系统的影响十分重要。该文采用野外调查、室内分析的方法,研究了银川平原草甸湿地植被的分布特征,草甸湿地土壤盐化等级的划分,盐分累积状况,该研究共设置样地57个,样方123个,根据传统的分类方法将研究区植物群落划分为3个植被型,8个植被亚型,27个群系。根据土壤表层全盐含量0~20 cm,把研究区土壤划分为5个等级:Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ,它们对应的含盐量分别为≥10、[4~10)、[2~4)、[1~2)和1 g/kg。银川平原草甸湿地土壤盐分呈自南向北逐渐增加的空间变化;不同草甸植被类型的含盐量大小为盐生草甸典型草甸湿生草甸;不同地形部位草甸的盐分含量表现为干湖滩洪泛平原堤外湖滩湿湖滩渠边沙滩,地下水埋深和水盐循环过程是盐分分布特征的决定性因素。
[Abstract]:Yinchuan plain wetland is a typical oasis wetland, which is not only the carrier of biodiversity, but also has important environmental regulation function and high productivity. It is very important to find out the spatial accumulation characteristics of soil salinity in meadow wetland of Yinchuan Plain, which is very important to understand the influence of water and salt migration process on wetland ecosystem in Yinchuan Plain. This paper adopts the method of field investigation and indoor analysis. The distribution characteristics of meadow wetland vegetation in Yinchuan Plain, the classification of soil salinization grade and salt accumulation in meadow wetland were studied. There were 57 sample plots and 123 sample plots in this study. According to the traditional classification method, the plant communities in the study area were divided into 3 vegetation types, 8 vegetation subtypes, 27 formations, and the total salt content of soil surface layer was 0 ~ 20 cm. The soils in the study area were divided into five grades: 鈪，

本文编号：1423101