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利用黑土长期定位试验,研究长期秸秆还田对黑土碳氮及玉米产量变化的影响。结果表明:与NPK处理比较,玉米秸秆还田处理没有显著促进黑土有机碳的积累。与试验初期相比,3个处理(CK、NPK和秸秆还田+NPK)土壤有机碳均同步增加,2006年与试验初比较均呈显著差异。与CK、NPK处理相比,秸秆还田+NPK处理能显著提高土壤N素的供应水平。各处理C/N比值在10.23～11.26之间。秸秆还田+NPK处理19年的玉米平均产量为8 958kg/hm2,与NPK处理基本一致,显著高于CK处理,表明施用有机氮(玉米秸秆还田)代替部分无机氮可以达到相同玉米产量水平。
The long-term location experiment of black soil was used to study the effects of long-term straw addition on carbon and nitrogen and corn yield in black soil. The results showed that compared with NPK treatment, corn stalk treatment did not significantly promote the accumulation of organic carbon in black soil. Compared with the beginning of the experiment, soil organic carbon of three treatments (CK, NPK and straw returning + NPK) increased synchronously, and there was significant difference between 2006 and the beginning of the experiment. Compared with CK and NPK treatment, straw returning + NPK treatment could significantly increase the supply of soil N. Each treatment C / N ratio between 10.23 ~ 11.26. The average corn yield after 19 years of straw returning + NPK treatment was 8 958 kg / hm2, which was basically the same as that of NPK treatment and significantly higher than that of CK treatment, indicating that the same corn yield could be reached by applying organic nitrogen (corn straw returning to the field) instead of some inorganic nitrogen .