论文部分内容阅读
在特制密闭盆钵甲,研究了~(15)N标记氮肥作水稻基肥混施时,氨的挥发及其在氮素损失中的重要性,随着通气速率的增高,氨的挥发及其在氮素损失中的重要性也增大,至换气频率达15—20次/分时即接近或达到最大值。在酸性水稻土上,硫铵的氮素损失的主要途径是反硝化作用,特别是气温较低的月份;尿素的氮素损失途径,在气温较低的月份中以反硝化作用为主,在温度较高的月份中,则氨的挥发与反硝化作用都是重要的;对碳铵来说,氨的挥发和反硝化作用都是氮素损失的重要途径。在石灰性土壤上,碳铵的氮素损失的主要途径是氨的挥发,而在硫铵和尿素的氮素损失中,氨的挥发和反硝化作用则都是重要的。
The volatilization of ammonia and its importance in nitrogen loss were studied in a special airtight pot bowl A. The volatilization of ammonia and its effect on the nitrogen loss were studied with the increase of ventilation rate The importance of nitrogen losses also increases, reaching a maximum or reaching a maximum of 15-20 breaths / minute. On acid paddy soil, the main pathways of nitrogen loss of ammonium sulfate are denitrification, especially in the month with lower temperature. The nitrogen loss pathway of urea is dominated by denitrification in the lower temperature month. In the higher temperature months, ammonia volatilization and denitrification are both important. For ammonium bicarbonate, ammonia volatilization and denitrification are both important ways of nitrogen loss. In calcareous soils, the main source of nitrogen losses from ammonium bicarbonates is ammonia volatilization, whereas ammonia volatilization and denitrification are all important in the nitrogen losses of ammonium sulfate and urea.