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棉隆对辣椒疫霉病的防效及对土壤微生物群落的影响

, PP. 834-840

Keywords: 辣椒,棉隆,辣椒疫霉,土壤微生物功能多样性

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Abstract:

为明确不同剂量棉隆对辣椒疫霉的防效及对土壤微生物群落的影响,在温室大棚条件下采用密封熏蒸法测定了不同剂量(300、450、600和750kg/hm2)棉隆土壤熏蒸对土壤疫霉病菌的抑制率及田间防效,并采用Biolog法研究了其对土壤微生物功能多样性的影响。结果表明,不同剂量棉隆在熏蒸后揭膜当天(0)、80、140d对辣椒疫霉病菌的抑制率分别为86.84%~100%、75.26%~96.37%和73.24%~95.46%;且80、140d时对辣椒疫霉病的防效分别为77.19%~96.49%和70.00%~93.33%;在棉隆熏蒸揭膜当天各剂量处理下微生物对碳源的利用(用平均每孔颜色变化率表示)以及微生物多样性指数中的丰富度指数、均匀度指数及McIntosh指数均显著低于对照,而Simpson指数显著高于对照,随着试验时间的延长,各剂量对其影响逐渐减小,但高剂量尤其是750kg/hm2处理在140d时仍与对照差异显著。表明棉隆剂量越高对辣椒疫霉病的防效越显著,对微生物活性影响越大,高剂量处理能明显抑制土壤微生物的活性,降低土壤微生物的多样性。

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