河西走廊春季不同盐碱土壤中微生物数量、酶活性与理化因子的关系

Relationship with soil microbial quantity,soil enzyme activity and physicochemical factor between different saline-alkali soil in Hexi Corridor in spring

【目的】揭示盐碱土壤微生物量与土壤因子间的关系。【方法】选择河西走廊不同盐碱程度的11个样点在春季进行采样,研究了土壤的微生物数量、酶活和理化性质,并对其进行方差分析、简单相关分析、逐步回归分析和主成分分析。【结果】河西地区原生盐碱地、次生盐碱地与农田土在土壤理化性质和土壤微生物数量等方面均有差异;河西地区土壤较贫瘠,土壤微生物数量较低,且分布有规律性,即原生盐碱土<次生盐碱土<农田土;放线菌、真菌、碱性磷酸酶、脲酶和有效磷5个因子是引起土壤微生物数量、酶活性与理化因子之间相关性的主要因素。【结论】结果证实河西地区盐碱土壤中磷的循环很大程度上影响着土壤微生物数量。

[Objective] In order to indicate the relationship between soil microbial quantity and soil factor. [Methods] Selected 11 typical plots under different saline-alkali soils in Hexi Corridor in spring, the soil microbial quantity, the enzyme activity and the physicochemical prop- erties were investigated and variance analyzed, simple correlation analyzed, stepwise regres- sive analyzed and principal component analyzed. [Results] It shows that there were obvious differences between the primary saline-alkali soil, the secondary saline-alkali soil and farm- land soil in soil physicochemical properties and soil microbial quantity. The soil microbial quan- tity was generally at a low level and at regularity： primary saline-alkali soil〈secondary sa- line-alkali soil〈farmland soil. Actinomyces, fungi, alkaline phosphatase, urease and effective phosphorus are primary factors which cause the correlation between the soil microbial quantity, enzyme activity and physicochemical properties. [Conclusion] The results indicate that soil phosphorus cycle influence the soil microbial quantity of saline-alkali soil in Hexi Corridor.