准噶尔盆地羽毛针禾(Stipagrostis pennata)生境土壤物理特性分析

Analysis on the Physical Characteristics of the Soil in the Habitats of Stipagrostis pennata in Junger Basin

本文对分布于准噶尔盆地的羽毛针禾(Stipagrostis pennata)种群的生境进行了土壤物理特性的对比分析,分析的项目包括土壤颗粒度、土壤含水量、土壤容重等。结果显示:羽毛针禾生境的土壤机械组成粘性沙粒比例小,其适生的沙丘中上部含水量也是极低,土壤的容重亦较大。对比分析的沙丘中下部和沙丘之间的无羽毛针禾分布的平地,其土壤粘沙比例、含水量相对较高,土壤容重相对较小。这说明了羽毛针禾局域分布的生境土壤物理特性,透气性好、粘沙比例低的沙丘中上部活化沙地地带是它的适生土壤类型,这从一侧面也解释了为什么羽毛针禾是活化沙地的先锋草本植物。

The paper is based on the analysis of the physical characteristics of the soil in the habitats of Stipagrostis pennata, including three analysis items：soil particle degree, soil water content and soil bulk density. The results showed that the plant prefers to the habitat which is of low propottion of sticky-sand, low water content in the middle-upper part of the desert dune and high soil bulk density rather than the one that is of the opposite characteristics of the former one. It indicates the physical characteristics of the soil in the habitats of S. pennata mentioned above, which can also explain why the grass plays as the pionner plant in improving the soil in the desert.