红壤和黄褐土根际土壤养分变化的研究

Rhizosphere Nutrients States in Red Soil and Yellow Cinnamon Soil

以红壤（可变电荷土壤）和黄褐土（恒电荷土壤）为材料，通过根垫法分组盆栽种植玉米、油菜等作物，获得2类土壤的根际土、近根际土以及非根际土样品，测定了它们的碱解氮、有效磷和有机质等含量。结果表明：在种植玉米、油菜等作物的条件下，均为根际土壤碱解氮含量最高，非根际土壤含量最小，意味着根际能活化或富集碱解氮；红壤、黄褐土非根际的有效磷含量比根际分别高28％～44％和29％～57％，表明根际有效磷存在亏缺；根际土与非根际土的有机质含量有所变化，但差异不明显。

Corn and rapeseed were planted through a grouping potted plant both on the yellow cinnamon soil and red soil. The alkali discomposed N, available phosphorus and organic matter on rhizosphere soil of the two soils and non-rhizosphere soil separated through 32μm nylon membrane were determined by conventional agro-chemical analysis. The results showed that on the base of corn and rapeseed growth, all alkali discomposed N content of rhizosphere soil was maximal and nonrhizosphere minimal, meaning that rhizosphere could activate or enrich this form N. Available phosphorus content or non-rhizosphere red soil was 28%～44% higher than that of rhizosphere. For yellow cinnamon soil, available phosphorus content of non-rhizosphere was 29%～57% higher than that of rhizosphere soil, indicating that available phosphorus in rhizosphere wane. The organic matter content of rhizosphere soil and non-rhizosphere soil changed unobviously.