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近地层臭氧浓度升高对麦田土壤微生物群落功能多样性的影响

DOI: 10.3724/SP.J.1145.2012.00309, PP. 309-314

Keywords: 臭氧浓度升高,麦田,水溶性有机碳,呼吸强度,土壤微生物功能多样性

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Abstract:

利用中国臭氧face(free-airo3concentrationenrichment,开放式空气臭氧浓度增高)试验平台,通过测定麦季土壤水溶性有机碳含量、土壤呼吸强度和biolog指标,研究了近地层臭氧浓度升高50%条件下(~70nmolmol-1),麦田土壤微生物功能多样性的响应.结果发现,臭氧浓度升高下麦田土壤水溶性有机碳含量提高,土壤微呼吸强度增加,平均吸光值显著高于对照(p<0.05).多样性指数结果显示,臭氧浓度升高对麦田土壤微生物丰富度和优势度指数没有显著影响,但是臭氧处理下均一度指数显著高于对照(p<0.05);主成分分析显示,相对于其它碳源,臭氧浓度升高对麦田土壤微生物的糖类物质利用能力的影响最大.研究揭示了1.5倍的近地层臭氧浓度增强了麦田土壤微生物碳源利用能力,特别是非优势微生物.图4表2参23

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