农业环境科学学报Issue(9)：1858-1865,8.DOI:10.11654/jaes.2014.09.026
不同施氮水平下小麦田氨挥发规律研究
Ammonia Volatilization from Wheat Soil Under Different Nitrogen Rates
摘要
Abstract
Ammonia volatilization is a major pathway of nitrogen losses from soils. Here a field experiment with different nitrogen rates was set up in Fangshan district, Beijing. The nitrogen rates included N0(0 kg·hm-2), N1(50 kg·hm-2), N2(100 kg·hm-2), N3(150 kg·hm-2), N4(200 kg·hm-2), N5(250 kg·hm-2), N6(300 kg·hm-2), and N7(400 kg·hm-2). Ammonia volatilization from soil in winter wheat field was measured using in-situ measurement method. Detectable ammonia volatilization occurred 1~2 weeks after N fertilization in winter wheat field, and the peaks of ammonia volatilization happened 2~3 days after fertilization. The ammonia volatilization rates were the highest after basal fertilization and top dressing, which were 2.41 and 1.42 kg·hm-2·d-1, respectively. The amount of ammonia volatilization varied from 0.81~4.29 kg·hm-2 after basal fertilization, 2.20~6.91 kg·hm-2 after top dressing. Throughout the entire winter wheat growing period, am-monia volatilization was higher in high- than low-nitrogen treatments. At nitrogen rates exceeding 150 kg·hm-2, total nitrogen loss increased sharply due to elevated ammonia volatilization. In the treatment with 150 kg·N hm-2, the winter wheat yield was as high as 5 493.63 kg· hm-2, higher than that of all other nitrogen treatments. Therefore, optimizing nitrogen rates could reduce ammonia volatilization loss without decreasing wheat production. The present data show that 150 kg·hm-2 nitrogen would be optimal for better yield and less ammonia volatiliza-tion losses.关键词
施氮量/氨挥发/冬小麦/原位测定Key words
nitrogen fertilizer/ammonia volatilization/winter-wheat/in situ determination分类
农业科技引用本文复制引用
山楠,赵同科,毕晓庆,安志装,赵丽平,杜连凤..不同施氮水平下小麦田氨挥发规律研究[J].农业环境科学学报,2014,(9):1858-1865,8.基金项目
国家科技支撑计划 （）
