摘要
对苏南地区不同水肥处理稻田土壤中铵态氮和硝态氮剖面分布、稻田氨挥发损失以及水稻地上干物质量及产量进行了研究。结果表明:稻田土壤中无机氮以铵态氮为主;铵态氮质量比随着土层深度的增加而降低,20～60cm深度土层中的铵态氮质量比相对稳定,随着水稻生育期的进行,稻田土壤中氨态氮质量比逐渐降低;稻田土壤中硝态氮质量比呈现上层低于下层的趋势;控制灌溉稻田施用控释肥减少了表层土壤中的铵态氮质量比以及底层土壤中的铵态氮和硝态氮质量比,降低了氮素损失的风险。控制灌溉和控释肥的使用,减少了稻田氨挥发损失,减少幅度达到83.71%。
The distribution of ammonium nitrogen and nitrate nitrogen in soils, the loss of ammonia volatilization, the mass of dry materials and the rice yield in paddy fields under different water and fertilizer treatments in southern Jiangsu Province were analyzed. The results show that the major fraction of inorganic nitrogen in soils of the paddy fields is the ammonium nitrogen. The content of the ammonium nitrogen in soils decreases with the increase of the soil depth. The mass ratio of the ammonium nitrogen is relatively stable at the soil depth of 20-60 cm and decreases with the process of bearing time of the paddy. The mass ratio of the nitrate nitrogen in soils also decreases with the increase of the soil depth. The application of controlled fertilizer release in the paddy fields under controlled irrigation reduces the mass ratio of the ammonium nitrogen in the surface soil layers and the mass ratio of the ammonium nitrogen and nitrate nitrogen in the bottom soil layer, resulting in the decrease of the risk of nitrogen loss. The application of controlled irrigation and controlled fertilizer release reduces the loss of the anmaonia volatilization in the paddy fields with a decrease by 83.71%.
出处
《水利水电科技进展》
CSCD
北大核心
2010年第1期40-44,共5页
Advances in Science and Technology of Water Resources
基金
国家自然科学重点基金(50839002)
中国博士后科学基金(20080440152)
江苏省研究生创新工程资助项目(CX08B-109Z)
关键词
控制灌溉
控释肥
铵态氮
硝态氮
氨挥发
稻田
controlled irrigation
controlled fertilizer release
ammonium nitrogen
nitrate nitrogen
ammonia volatilization
paddy field
