日光温室辣椒连作不同年限土壤微生物种群变化及酶活性研究

Study on microbial and enzyme activity of capsicum soil different ages in sunlight greenhouse

以日光温室辣椒连作土壤为对象,研究不同连作年限土壤微生物数量、类群及酶活性的变化。结果表明,土壤微生物数量、酶活性表现出明显的温室连作效应,随着连作年限的增加,土壤微生物类群细菌/真菌、放线菌/真菌值呈下降趋势,微生物由"细菌型"向"真菌型"过渡,其中氨化细菌先增加后减少、硝化细菌呈减少的趋势;多数土壤酶活性随着连作年限的增加呈下降趋势,但过氧化氢酶活性呈增加趋势。

Varition of microflora and enzyme activity in solar greenhouse soil contions cropping for 1, 3, 5, 7, 9 years was studied. The results showed that the soil microbial number and enzyme activity showed a significant greenhouseeven effect, with increasing years of continuous cropping, the total microorganism, bacteria showed a change, the decrease in the num- ber of ＇ B/F, A/F＇ , microbes from the ＂bacterial-type＂ transition to the ＂fungal type＂, including ammonification bacte- ria nitrifying bacteria showed a decreasing trend. With increasing years of continuous cropping, the majority of soil enzyme activity showed a downward trend but the catalase activity showed an increasing trend.