[ Objective] The aim was to study on response of N20 emissions of farmland ecosystem on temperature rising. [ Method] In farmland ecosystem in Huaibei in Anhui Province, N2O emission by twelve varieties of crop on temperature was researched with Denitrification-Decomposition (NDC). [Result] Response of dryland crop on temperature rising can be divided into three categories, as follows; The first category, N2O emission of crop changed little during the temperature increasing, for example, from 0 ℃ to 3 ℃, the emissions by potatoes, cotton , maize and rapeseed rape increased little and decreased little when temperature changed from 1.5 ℃ to 3 ℃. Crops of the second category declined with temperature increasing in N2O emission, for example, N2O emission decreased by 8. 1% with temperature increasing from 0 ℃ to 3 ℃ , including sugar cane, tobacco, wheat, soybean and pea. In third category, N2O emission of crop grew with temperature increasing, for example, the emission of rice, vegetables and fruit trees increased by 22. 8% when the temperature grew from 0 ℃ to 3 ℃. [ Conclusion ] The research indicated that N2O emission in ecosystem of dry farmland increased little with temperature rising.%[目的]研究农作物N2O排放量对气温升高的响应.[方法]以安徽省淮北地区农田生态系统为研究对象,利用生物地球化学过程模型DNDC,研究12种农作物N2O排放量对气温升高的响应.[结果]旱地农作物对气温升高的响应可以分为3类.第一类农作物N2O排放量对气温升高不敏感,包括土豆、棉花、玉米和油菜,气温从升高0℃到升高3℃的情况下,N2O排放量变化不大,其中,当气温从升高0℃到升高1.5℃,排放量略微增大,从升高1.5C到升高3℃,N2O排放量稍微下降.第二类作物N2O排放量对气温升高敏感,排放量随温度升高而下降,包括甘蔗、烟草、小麦、大豆和碗豆,当气温从升高0℃到升高3℃,N2O排放量下降8.1％.第三类农作物N2O排放量对气温升高敏感,排放量随温度升高而升高,包括水稻、蔬菜和果树,当气温从升高0 ℃到升高3℃,N2O排放量升高22.8％.[结论]该研究结果表明在气温升高的情况下,旱地农田生态系统N2O排放量并没有大幅增加.
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