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对东北黑土区东山沟坡耕地土壤有机质、全氮、碱解氮、速效磷和土壤转化酶、脲酶、碱性磷酸酶活性进行了测定,并对其结果做相关分析,表明土壤酶可以作为评价黑土土壤肥力的指标,有机质仍是黑土土壤养分和酶活性的源和库。黑土区坡耕地土壤表层养分含量和酶活性高于次表层的相应指标,且呈现显著性差异。据此,建议黑土区坡耕地积极探索和推广秸秆还田、免耕等水土保持新措施,提高有机质含量,以遏制土壤表层质量退化。
Soil organic matter, total nitrogen, available nitrogen, available phosphorus, soil invertase, urease and alkaline phosphatase activity in sloping farmland of Dongshan gully region in northeastern China were measured and their correlations were analyzed. The results showed that soil enzyme could be used as an indicator Soil fertility indicators of black soil, organic matter is still black soil nutrients and enzyme activity of the source and reservoir. Soil nutrient content and enzyme activity of soil in sloping farmland in black soil area were higher than those in subsurface and showed significant differences. Therefore, it is suggested that slope farmland in black soil area should actively explore and popularize new measures of soil and water conservation, such as straw returning and tillage, to increase the content of organic matter so as to restrain the degradation of soil surface quality.