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通过分析连续耕种5、10、15、20、30年农田土壤的4种酶活性及土壤理化性质,得出结论:随着种植年限的增加,灌溉、耕作、施肥等人类生产活动改变了酶在各土层间的活性格局。过氧化氢酶活性和蔗糖酶活性随年限的增加总体趋势增加,有机质和土壤水分变化类似,一致表现出“N”形的变化趋势,脲酶活性和磷酸酶活性呈现“M”形的相似变化趋势;总盐含量和pH值随着种植年限的增加均呈下降趋势,表明连续的土壤耕作、施肥等人类活动有利于降低干旱地区土地盐渍化过程。农田土壤连续耕作15年时,原生土壤熟化,结构发生改变,产生了土壤酶活性及理化性质适应的转变拐点。
By analyzing the four kinds of enzyme activities and soil physical and chemical properties of 5, 10, 15, 20 and 30 years of continuous cropping, the conclusion was reached that the human activities such as irrigation, tillage and fertilization changed the enzyme activities Activities of the soil layers. The catalase activity and invertase activity tended to increase with the increase of years, and the changes of soil organic matter and soil moisture were similar, showing a consistent trend of “N” shape. The urease activity and phosphatase activity showed “M” shape . The total salt content and pH value showed a downward trend with the increase of planting years, indicating that continuous human activities such as soil cultivation and fertilization are beneficial to reduce the salinization process in arid areas. 15 years of farmland soil continuous cultivation, the native soil maturation, the structure changes, resulting in changes in soil enzyme activity and physical and chemical properties of turning point.