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与非根际土壤相比较，研究了胡桃楸落叶松纯林与混交林中根际土壤pH值、有机质及氮 、磷、钾等养分元素的特征。结果表明：各林分中，除胡桃楸纯林外，根际土壤的pH值均不 同程度低于非根际土壤；除混交林中落叶松根际土有机质含量略低于非根际土外，根际土壤 有机质含量均高于非根际土壤；根际土壤存在氮的相对累积，磷和钾在根际则具有一定的亏 缺趋势，其程度与树种相关；各林分下，氮、磷、钾在根际中均得以活化，表现为根际土壤 速效氮、磷、钾含量偏高；混交林中落叶松根际速效氮含量明显高于其纯林，而混交林中胡 桃楸根际速效磷、钾含量明显高于其纯林。
Compared with non-rhizosphere soil, pH, organic matter, nitrogen, phosphorus and potassium of rhizosphere soil were studied in pure and mixed forest of Larch. The results showed that the pH value of rhizosphere soil was lower than that of non-rhizosphere soil except for the pure Juglans sigmina forest in all forest types except that the content of organic matter in rhizosphere soil of larch was slightly lower than that in non-rhizosphere soil in mixed forest, Rhizosphere soil organic matter content were higher than non-rhizosphere soil; rhizosphere soil relative accumulation of nitrogen, phosphorus and potassium in the rhizosphere has a certain trend of the deficit, the extent of the tree species; under each forest, nitrogen, phosphorus , Potassium in the rhizosphere are activated, the performance of rhizosphere soil available nitrogen, phosphorus and potassium content is high; mixed forest of rhizosphere available nitrogen content was significantly higher than the pure forest, while the mixed forest of Juglans rosea rhizosphere quick-effect Phosphorus, potassium content was significantly higher than its pure forest.