菌株N32对大麦秸秆还田土壤化学性质的影响

Effects of Bacteria N32 on Soil Chemical Properties in Barley Straw Returning

为了研究纤维素降解菌N32对大麦秸秆还田的影响,采用了盆钵试验方法,设置3个处理:处理1为不加菌剂和秸秆的纯土壤(作为对照组CK),处理2为秸秆与土壤混合物(JT),处理3为使用菌剂处理的秸秆与土壤混合物(JJT),并分析了土壤养分含量、土壤酶活性及秸秆降解的变化规律。结果表明:2.0%聚乙二醇试剂的预处理效果最好,秸秆失重率达13.9%;JJT显著降低了土壤pH值,提高了土壤碳氮磷钾养分含量和土壤脲酶、纤维素酶、碱性磷酸酶等酶活性,且施加菌剂的秸秆失重率在40 d内达17.95%,比CK提高了40.78%。由此可见,纤维素降解菌N32对秸秆还田有一定的促进作用,加快了秸秆的腐熟速度,并提高了土壤肥力。

In order to study the effects of cellulose degrading bacteria N32 on barley straw returning,the pothole test method was adopted and three treatments were set up.Treatment 1 was soil without bactericide and straw(as control group CK),treatment 2 was straw and soil mixture(JT),and treatment 3 was straw treated with microbial agent and soil mixture(JJT),and analyzed the changes of soil nutrient content,soil enzyme activity and straw degradation.The results showed that the pretreatment effect of 2.0%polyethylene glycol reagent was the best,and the weight loss rate of straw was 13.9%.JJT effectively reduced soil pH value,increased soil organic carbon,nitrogen,phosphorus and potassium nutrients and soil urease,cellulase,alkaline phosphatase enzyme activities.And the straw weightlessness rate of the applied microbial agent was 17.95%in 40 days,increased by 40.78%compared to CK.Thus,cellulose degradation bacteria N32 on straw returning had a certain role in promoting,accelerated the rotting speed of straw,and improved soil fertility.