山地沼泽土壤K含量分布特征及季节动态

Distribution Characteristics and Seasonal Dynamics for K Content in the Soil of Mountain Swamp Wetland

选择小兴安岭北部的几种典型山地沼泽湿地为研究对象,在生长季内逐月分层采集样品,测定和分析K元素在湿地土壤中的分布特征和季节动态。结果表明:全K、速K含量在水平分布上均随地势的抬高及与河流距离的加大而增加,不同类型湿地土壤中全K、速K含量在土壤表层(A)差异显著,B层差异极显著,C层差异不显著。不同类型湿地(样地带)土壤中全K含量在剖面垂直方向上均表现为A层<B层<C层,而速K含量则表现为A层>B层,C层变化具有波动性。土壤全K含量在整个生长季变化幅度较小,波动范围均在20%以下。速K含量在土壤A层有着很强的季节性变化规律,近似于单调下降趋势,而在B、C层中季节变化较小。应用SPSS软件,分别对各层土壤速K含量进行非线性回归模型拟合,取得了较理想的拟合效果。

The distribution characteristics and seasonal dynamics of the element K in the wetland soil were measured and analyzed by choosing several kinds of typical mountain swamp wetlands in the south of Xiaoxing’an Mountains as the research object and taking stratification sampling by month in the growing season. The results showed that the total K and available K increased with the hypsography run-up and the distance from the river fortifying, and the differences of the total K and available K content in different kinds of wetland soil were remarkable in the soil surface (Horizon A), extremely remarkable in Horizon B, and not remarkable in Horizon C. The total K contents in different kinds of wetland soil (sample plot zone) all showed Horizon A<Horizon B<Horizon C in the vertical direction of soil section ,but the available K contents showed Horizon A>Horizon B and the changes of Horizon C took on fluctuation .The variation extent of total K content in the soil was very small in the whole growing season and the fluctuating range was under 20%.The available K content had a very strong seasonal changing rules in Horizon A——it approached the monotonous descent tendency, but the seasonal variation was small in Horizon B and C. Moreover, an ideal fitting effect was obtained by applying SPSS software and carrying on the nonlinear regression model fitting separately to the available K content in each horizon of soil.