摘要
采用密闭室法测定土壤氨挥发通量,进而计算施入土壤中氮肥的氨挥发损失量,研究了东北黑土区不同作物施氮量和施肥深度下氮肥的氨挥发。结果表明,施用尿素促进了农田氨挥发损失,并随施肥量的增加而增加,当表施氮量30 g/m2时,氨挥发损失率达21.68%。在相同施氮量的条件下,随施肥深度的增加而减少,当施肥深度为9cm,施氮量30 g/m2时,氨挥发损失率仅达2.49%。氨挥发损失氮量与施氮量(>0)呈抛物线性关系。推荐东北黑土区种植大豆优化施肥深度在3 cm以下;而玉米基肥优化施肥在6 cm以下,追肥施肥深度在3 cm以下。
Ammonia volatilization of nitrogen fertilizer was studied by nitrogen fertilizer applied quantity and depth at the national field research station of agro-ecosystem of Chinese academy of sciences in Hailun county, Heilongjiang province, China. In this study, there were eight different nitrogen fertilizer applied quantity and four depths. The flux of ammonia volatilization was measured with closed chamber method, then calculating the ammonia volatilization of nitrogen fertilizer from soil. Results showed that urea application accelerated farmland ammonia volatilization, and increasing with fertilizer application increase. When nitrogen application was ammonia volatilization, ammonia volatilization loss of nitrogen added up to 21.68%. Under the same quantity of nitrogen application conditions, ammonia volatilization loss of nitrogen decreased with depth, and was 2.49% at 9 cm depth. There was parabola relationship between ammonia volatilization loss and nitrogen application. We suggested that fertilizer application depth was below 3 cm for soybean, 6 cm for maize base fertilizer application and 3 cm for supplement of fertilizer.
出处
《水土保持学报》
CSCD
北大核心
2009年第1期198-201,共4页
Journal of Soil and Water Conservation
基金
国家重点基础研究发展计划(973计划)项目(2005CB121101)
中国科学院东北地理与农业生态研究所前沿领域项目(KZCX3-SW-NA3-26)
黑龙江省自然科学基金项目(C200615)
关键词
黑土
氮肥
氨挥发
black soil
nitrogen fertilizer
ammonia volatilization
