章古台沙地樟子松人工林土壤盐分动态变化研究

A Study on Soil Salinity Variation of Pinus sylvestris var.Mongolica Plantations in Zhanggutai Sandy Land

通过应用电导率法，对不同密度和不同年龄沙地樟子松人工林分内土壤盐分总量和各种阳离子含量进行一个生长季的观测，结果表明：各标准地不同土层土壤盐分含量都很小，且在7～9月变化幅度较小，波动范围在5％～27％之间；表层土壤盐分含量季节变化规律基本一致，最大值均出现在8月份，其它层次土壤盐分含量季节变化各标准地间差异很大。各标准地土壤剖面盐分垂直变化幅度均不大，但在整个观测季节基本表现出了随着土壤深度增加而增大的趋势，土壤中K^＋含量很低，变化幅度小；土壤中其它阳离子的含量及变化趋势与K^＋相似。因此，综合可以推断，在目前密度和年龄条件下，章古台沙地樟子松人工林土壤盐分总量及其各阳离子与林分密度和年龄几乎无关；沙地樟子松人工林衰退与土壤盐分没有直接的关系。

Soil salininty was measured in the sandy Pinus sylvestris var. Mongolica plantations of different density and the different age through the way of electrical conductivity （EC）. The results are as follows： the total soil soluble salt is all very low in every forest, and the change range is small, varying from 5% ~ 27% dtiring the period from July to September. The seasonal change of surface layers＇ soil salinity content is simil- Jar in every forest stand, the maximum values all appear in August, the other layers＇ soil salinity contents are different in differents forests. In soil section, the vertical variation scope of soil salinity is not big in all the forests, but basically, they all increase along with the increase of soil depth. The content of K^＋ is very small and very stable, and the contents of other cations are similar to that of K^＋ in the soil. Therefore, under the present density and the age conditions, the total soil soluble salt quantity and its various cations have nothing to do with the density and the age of the sandy Pinus sylvestris var. Mongolica plantation in Zhanggutai. The sandy Pinus sylvestris var. Mongolica plantation has no direct relation with soil salinity.