论文部分内容阅读
以云南设施栽培面积最大的六个片区设施土壤为研究对象,通过实地采样与分析测定,重点研究了设施土壤中和氮素转化有密切关系的脲酶活性的变化趋势。结果表明:大棚设施土壤中0～20cm脲酶活性变化范围为0.093~1.505(mg g-1,24h.37℃),平均值为0.474(mg g-1,24 h.37℃),略低于露地;20~40 cm脲酶活性变化范围为0.102~1.279(mg g-1,24 h.37℃),平均值为0.396(mg g-1,24 h.37℃),较露地菜园土高;上下两层土壤中脲酶活性都随着设施栽培年限的增加,均表现为增-降-增;相关分析表明,土壤pH值与脲酶活性呈极显著正相关,而与和碱解氮相关性不显著。
Taking the soil with the largest facility cultivation area in Yunnan as the research object, the changing tendency of urease activity closely related to nitrogen transformation in facility soil was focused on field sampling and analysis. The results showed that the range of 0-20 cm soil urease activity in the greenhouse varied from 0.093 to 1.505 (mg g-1, 24 h, 37 ℃) with an average of 0.474 (mg g-1, 24 h, 37 ℃) The average soil urease activity ranged from 0.102 to 1.279 (mg g-1, 24 h, 37 ℃) with an average of 0.396 (mg g-1, 24 h, 37 ℃) The urease activity in the top and bottom two layers of soil increased with the increasing of the cultivation years of the facilities, all of which showed increasing-decreasing-increasing. The correlation analysis showed that the soil pH value had a significant positive correlation with the urease activity but not with the alkaline hydrolysis nitrogen Significant.