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以黑土为研究对象,通过室内培养试验研究了甜菜、玉米、大豆根系对土壤交换性无机氮、水溶性有机氮、微生物量氮和土壤全氮含量变化的影响。结果表明:添加甜菜、玉米、大豆根系,均降低土壤交换性无机氮和水溶性无机氮含量。三种作物根系处理均提高土壤水溶性有机氮和微生物量氮含量以及土壤交换性无机氮、水溶性有机氮、微生物量氮三者总含量,尤其是可以显著增加微生物量氮含量,从而大大增强了黑土的缓效氮的供应能力。并且这些作用与作物根系种类和数量密切相关。大豆、玉米、甜菜根系对土壤全氮影响较小,未达到显著水平。
Taking black soil as the research object, the effect of root system of beet, corn and soybean on the contents of soil exchangeable inorganic nitrogen, water-soluble organic nitrogen, microbial biomass nitrogen and soil total nitrogen was studied through laboratory culture experiments. The results showed that the content of soil exchangeable inorganic nitrogen and water-soluble inorganic nitrogen were decreased by adding sugar beet, corn and soybean roots. The three kinds of crop root treatments increased the content of soil water-soluble organic nitrogen and microbial biomass nitrogen and the total content of soil exchangeable inorganic nitrogen, water-soluble organic nitrogen and microbial biomass nitrogen, especially significantly increased the microbial biomass nitrogen The slow-growing nitrogen supply capacity of black soil. And these effects are closely related to the type and quantity of crop roots. Soybean, maize and beetroot had little effect on soil total nitrogen and did not reach significant level.