生态环境学报Issue(3)：387-391,5.
不同施氮水平对玉米产量、氮素利用效率及土壤无机氮含量的影响
Effects of different nitrogen fertilization levels on maize yield, nitrogen utilization and inorganic nitrogen content in soil
摘要
Abstract
Effects of different nitrogen fertilization levels on maize yield, nitrogen utilization and residual amount of soil nitrate and ammonium nitrogen were investigated. The results showed that maize yield increased with the increment of nitrogen application rate. When the nitrogen application rate was 165 kg·hm-2, maize showed the highest nitrogen utilization efficiency. A trend of decrease on maize yield was observed when the nitrogen application rate was higher than 165 kg·hm-2. Excessive amount of nitrogen fertilizer can’t further increase the maize nitrogen uptake, and the utilization efficiency of the fertilizer was decreased. Due to the different nitrogen fertilization levels after maize harvest, the distribution of mineral nitrogen content varies in different soil layers. The amount of NO3--N was increased significantly with the increase of nitrogen fertilizer in 0~80 cm layers of soil profile. A hyper-accumulation of nitrate was found in the surface layer, the lowest level of NO3--N content was observed in the middle layers. Below a depth of 100 cm, the lowest soil NO3--N content and risk of nitrate leaching occurred when nitrogen application rate was 165 kg·hm-2. The NH4+-N content was relatively low in soil. Nitrogen application rate mainly influence on the soil NH4+-N in 0-20 cm layers. There is no significant correlation between the soil NH4+-N content and N application rate. Considering the maize yield, nitrogen utilization efficiency and ecological environmental benefits, N application rate of 165 kg·hm-2 was identified to be the optimum amount. This work provides a basis for the rational use of nitrogen fertilizer.关键词
施氮量/玉米产量/氮素利用率/硝态氮/铵态氮Key words
N application/maize yield/N utilization efficiency/nitrate nitrogen/ammonium nitrogen分类
农业科技引用本文复制引用
王爽,王玉峰,孙磊,陈雪丽,谷学佳,李伟群,王晓军,张磊,刘颖,潘亚清..不同施氮水平对玉米产量、氮素利用效率及土壤无机氮含量的影响[J].生态环境学报,2013,(3):387-391,5.基金项目
国家自然科学基金项目（41201257）；公益性行业（农业）科研专项（201003014-4）；国家科技支撑计划子课题（2012BAD15B05）；黑龙江省青年基金项目 （）
