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以燕麦坝莜一号为试验材料,设置不施褐煤腐殖酸常规处理(CK),仅2011年施用腐殖酸,连续2年、连续3年、连续4年施用腐殖酸,以研究腐殖酸对土壤微生物量及酶活性的影响,从而明确腐殖酸对土壤生物学性状的改善效果。试验结果表明,连续多年施用腐殖酸可增加燕麦苗期土壤微生物生物量碳、氮、磷含量,增强土壤蔗糖酶、脲酶、过氧化氢酶活性,有利于培肥土壤,促进土壤中有机物质的分解和转化以及土壤碳、氮等养分的循环,达到提高土壤质量的目的。不同施用年限腐殖酸对土壤酶活性及微生物量的影响不同,连续施用腐殖酸4年的作用优于连续施用3年、2年、1年,4种处理均优于CK处理,说明土壤腐殖酸的累积效应对土壤微生态环境的改善起到积极的作用,其中多年施用腐殖酸对改善10~20cm土壤脲酶活性、微生物生物量氮含量作用显著,能为作物根系生长提供充足的氮素。试验发现土壤酶活性与土壤微生物量之间具有很好的相关性,土壤酶活性可以作为评价土壤微生物量高低的指标。
Taking oat barley No. 1 as test material, the conventional treatment of humic acid without lignite was set, only humic acid was applied in 2011 for two consecutive years for three consecutive years, humic acid was applied for four consecutive years to study the effects of rot The effect of humic acid on soil microbial biomass and enzyme activity, so as to clarify the effect of humic acid on soil biological properties. The results showed that continuous application of humic acid for many years could increase soil microbial biomass C, N and P in oat seedlings and increase the activity of soil sucrase, urease and catalase, which was beneficial to soil fertility and soil organic matter Decomposition and transformation and soil carbon, nitrogen and other nutrients recycling, to achieve the purpose of improving soil quality. Different years of application of humic acid on soil enzyme activity and microbial biomass, the continuous application of humic acid for 4 years is better than the continuous application of 3 years, 2 years, 1 year, 4 kinds of treatment are better than the CK treatment, indicating that soil The cumulative effect of humic acid played a positive role in the improvement of soil micro-ecological environment. Among them, application of humic acid for many years had significant effect on improving soil urease activity and microbial biomass nitrogen content in 10-20 cm soil layer, Nitrogen. The results showed that there was a good correlation between soil enzyme activity and soil microbial biomass, and soil enzyme activity could be used as an index to evaluate soil microbial biomass.