摘要
在北京潮土上研究了冬小麦-夏玉米轮作体系下土壤氮素反硝化损失。结果表明,不同氮肥用量处理,土壤氮素反硝化损失量为4.71～9.67kg·ha-1。夏玉米生育期是反硝化损失的关键时期。氮肥施用后的1～2周是氮素反硝化损失的最剧烈阶段。土壤N_2O的生成、排放与反硝化作用有相似的规律性,N_2O可能大部分来自于硝化作用。
Soil denitrification was studied in winter wheat-summer maize rotation cropping system with an aquic cambisol. Results showed that the N loss amount by denitrification ranged from 4.7 to 9.7 kg·ha-1 with different rates of fertilizer nitrogen. The key stage of denitification was during summer maize-growth-period, especially within 1-2 weeks after fertilizer nitrogen was applied. Similar trend was found between soil N2O production/emission dynamic and denitrification dynamic in the rotation system. This may indicate that N2O mainly produced in nitrification process.
出处
《中国农业科学》
CAS
CSCD
北大核心
2004年第10期1492-1496,共5页
Scientia Agricultura Sinica
基金
国家自然科学基金重大项目资助(30390080)
北京市科技新星资助项目(954813300)
