摘要
为了研究南方稻田在施肥后表面水和渗漏水中三氮的动态变化规律,故设计了这个试验。试验结果表明:田面水中NH4+和TN在1d后达到极大值,随时间推移,下降较快。NO3-,NH4+/TN,NO3-/TN和(NH4++NO3-)/TN是先升后降。NH4+和TN可作为稻田田面水污染监测的主要氮素指标,NO3-作为辅助监测指标。三氮浓度变化与施氮量呈明显正相关。施氮9d是防止三氮大量流失的关键时期。
To study the change characteristics of the concentration of NH4+,NO3-and TN in the surface water and leakage water of the paddy field, the outcome explains that, in the paddy field with an independent irrigation system, after 1 day urea employed each time, the change tendency of NH4+ and TN is firstly increasing, and attaining the bigger value; then decreasing fast. However the tendency of NO3- is increasing, then decreasing. The trend of the ratio of NH4+/TN,NO3-/TN and(NH4++ NO3-)/TN is similar to the tendency of NO3-. The experiment explains that NH4+ and TN may be the key measure indexes about the water out of the paddy field, NO3- may be the assistant one. There is a positive relation between the concentration of three kinds of nitrogen and N application amount. 9 days after urea employed is the key time to avoid gross of three kinds of nitrogen in the water surface of the paddy field lost.
出处
《水土保持学报》
CSCD
北大核心
2003年第3期51-54,共4页
Journal of Soil and Water Conservation
基金
国家自然科学基金(60274052)
浙江省自然科学基金(697041)资助
