摘要:
通过乌泥田、黄泥田、沙质田、冷浸田四种水稻土的脲酶活性变化的研究,及土类、脲酶活性与尿素利用率的分析,结果表明,四种土壤脲酶活性是有明显的差别的。其脲酶活性随土层不同、季节变化、施肥措施、脲酶产生菌数量多少等差别,脲酶活性也在变化。供试土壤:乌泥田脲酶活性高,其尿素利用率最低,冷浸田脲酶活性低,其尿素利用率最高。黄泥田脲酶活性与尿素利用率介于两者之间。
Abstract:
The change in urease activity in 4 types of paddy soil, i.e. percogenic paddy soil, submergic paddy soil, sandy clay soil and gleyed paddy soil, was studied. And the relationship between the activity of urease and the efficiency of urea in the soil types was analysed. Results showed that the urease activity of soil types was different from each other’s, and changed with soil profile,season, method of fertilizer application, number of urease-producing microorganisms as well as the total nitrogen of soil. Of the 4 soil types, percogenic paddy soil had the highest urease activity and the lowest efficiency of urea; gleyed paddy soil had the lowest urease activity and the highest efficiency of urea; submergic paddy soil lay between the above two in both the activity of urease and the efficiency of urea.The change in urease activity in different paddy soil showed a tendency that activity was higher in early cropping season than in late cropping season; in top soil layer than in low soil layer.The soils where urea or other fertilizers was applied with organic manure increased their activity of urease as compared with the control treatment.
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