寿光大棚土壤团聚体中交换性盐基离子组成与土壤团聚性关系

以山东寿光连作2,5,8,10年的大棚土壤为材料,临近露天麦地土壤为对照,研究土壤团聚体中交换性盐基离子组成变化与土壤团聚性关系。结果表明：交换性K＋、Na＋、Ca2＋和Mg2＋的平均含量在〉0.25mm大团聚体中分布比较均匀,均高于在〈0.25mm微团聚体中的含量。随着大棚种植年限延长,各粒径团聚体交换性K＋都呈逐渐增加的趋势,而交换性Na＋和Mg2＋呈现先上升后下降再回升的变化,交换性Ca2＋表现为先上升后下降的变化。其中,在0-10cm土层比在10-20cm土层变化更明显。各团聚体中,盐基离子平均含量为Ca2＋〉Mg2＋〉K＋〉Na＋。同时表明,（K＋＋Na＋）/（Ca2＋＋Mg2＋）的比值随土壤团聚体粒径的减小而增大。土壤中盐基离子储量和贡献率主要由团聚体的质量含量所决定,〉0.25mm的大团聚体贡献率可占88%～90%,其中以2～5mm团聚体储量最大。因此,生产中通过提高土壤大团聚体数量,可增强土壤的供肥保肥能力。

Relationship Between the Composing of Exchangeable Base Cation in Soil Aggregate and Soil Glomeration of Greenhouse in Shouguang

In this paper,the relationship between the composing of exchangeable base cation in soil aggregate and soil glomeration of greenhouse in Shouguang were studied with the greenhouse soils of continuous cropping years of 2,5,8,and 10,and with the open field soil nearby as control.The results indicated that the average contents of exchangeable K+,Na+,Ca2+ and Mg2+ distributed evenly in more than 0.25 mm macroaggregates and higher than that of less than 0.25 mm microaggregates.Along with the continuous planting ...