摘要
采用田间小区试验,连续2年研究了施氮量、分子膜对稻田氮素淋洗损失和氮素平衡的影响,结果表明:稻田以铵态氮淋洗损失最少,90cm处浓度低于0.2mg/L;水稻移栽和烤田后硝态氮浓度达到峰值,以90cm处浓度为0.2～0.9mg/L;整个稻季氮素淋洗量为3.2～5.6kg/hm2,占施氮量的1.4%～2.5%。
Nitrogen losses via leaching on paddy soil in Taihu Lake region were studied for two successional years. Results showed that ammonium leaching was minor and its coneentration at 90cm depth was below 0.2 mg/L. Nitrate and dissolved organic nitrogen were the main forms for nitrogen leaching. There were two peak values for nitrate during rice growing season： one was at the beginning of riee season and the other was after soil drying. The nitrate concentration ranged from 0.2 to 0.9 mg/L at 90 cm depth. Nitrogen load in leaehate was 3.2-5.6 kg/hm^2 in rice season, accounting for 1.4 %-2.5 % of applied fertilizer. Nitrogen surplus besides leaching losses paralleled N uptake by rice,iudicating that the hazards of water and air pollution of nitrogen fertilizer applied on paddy soil were great.
出处
《安徽农业科学》
CAS
北大核心
2006年第12期2792-2794,共3页
Journal of Anhui Agricultural Sciences
基金
国家自然科学基金(40571077)
中国科学院知识创新工程项目(KZCX-413)。
关键词
稻田
氮肥
淋洗
Paddy soil
Nitrogen fertilizer
Leaching
