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生物复混肥对土壤微生物功能多样性及土壤酶活性的影响

Keywords: 生物复混肥,功能多样性,土壤微生物群落,土壤酶活性

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Abstract:

在温室盆栽条件下,采用Biolog微平板技术,研究了玉米施用等养分量的无机肥、有机无机复混肥、生物复混肥后土壤微生物群落功能多样性及土壤酶活性的动态变化。结果表明,生物复混肥处理的微生物群落平均颜色变化率(AWCD)、微生物群落Shannon指数(H)、丰富度指数(S)和Shannon均匀度指数(E)均为最高;微生物群落主成分分析表明,不同施肥处理土壤微生物群落碳源利用特征有一定差异,PC1将生物复混肥与其他处理明显区分,生物复混肥处理分布在PC1的正方向,其他处理分布在PC1的负方向;起分异作用的主要碳源有糖类、羧酸类和氨基酸类;土壤蔗糖酶、脲酶活性均以生物复混肥处理最高,分别为72.74mgglucose·g-1·(24h)-1和1.15mgNH3-N·g-1·(3h)-1。研究表明,生物复混肥的施用比等养分量的有机无机复混肥处理能显著提高土壤微生物群落碳源利用率、微生物群落的丰富度和功能多样性,增强土壤蔗糖酶和脲酶活性。

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