不同氮肥管理方式对华北粮田 N2O 排放和作物产量的影响分析.

Through the published literature analysis of wheat and maize field in North China, this study investigated the effects of different management methods of nitrogen(N) application rates, basal/topdressing ratios and N control measures on the soil N2O emission and crop yield. The results showed that reducing N application rates and adjusting basal/top dressing ratios under high N level could decrease soil N2O emissions. Besides, N application with nitrification inhibitor dicyandiamide(DCD) was an effective practice for wheat/maize yield enhancement and soil N2O emission reduction. In order to reduce the soil N2O emission as well as ensure crop yield production in North China, the optimal N application rate of 167~174 kg·hm-2 at basal/top dressing ratio 1:1 with DCD was recommended for wheat production. As a result, soil N2O total emission was 0.31 kg·hm-2 and wheat grain yield reached more than 6200 kg·hm-2. For maize production, the optimal N application rate of 177~181 kg·hm-2 at basal/top dressing ratios 2:3~1:2 with DCD was regarded as the best practice. Soil N2O total emission was 1.70 kg·hm-2 and maize grain yield exceeded 9000 kg·hm-2. [ABSTRACT FROM AUTHOR]