生态环境学报Issue(3)：392-397,6.
华北平原冬小麦季化肥氮去向及土壤氮库盈亏定量化探索
Exploration of N fertilizer fate and quantitative soil nitrogen pool budget in growing season of winter wheat in north China plain
摘要
Abstract
In order to increase utilization efficiency of nitrogen fertilizer in planting system of winter wheat in North China plain and decrease the environmental pollution from fertilizer nitrogen, the original date were collected from the previous studies of 15N-microplot experiments to investigate the relationships of fertilizer nitrogen, crop nitrogen and soil nitrogen, and explore the fate of fertilizer nitrogen in winter wheat cropping system and budget of soil nitrogen pool. The results illstrated thatthe N uptake by wheat plants from fertilizer nitrogen increased with the increase of N fertilizer application rates, while the N uptake from soil nitrogen showed the opposite trend;There were the significantly positive linear correlations between nitrogen application rates and balance of soil N in the two conditions of 50%and 100%straw returning to field. When nitrogen fertilizer rates were N 192 kg·hm-2 and N 166 kg·hm-2 at these two situation, the soil nitrogen pool reached the balance;The N utilization efficiency when nitrogen rate recommended is much higher than that when the traditional nitrogen rate applied in soil with winter wheat. Excessive application of N fertilizer not only improved crop yields but also reduced the nitrogen utilization efficiency and increased N loss and N accumulation in soil. In the conditions of 0%, 50% and 100% straw returning to field, there were the significant linear relations between the amounts of different N fates and nitrogen application rates (N 75~375 kg·hm-2) under the three application above. A significant correction relation was showed between total nitrogen recovery rate as well as straw use rate of 0%straw returning to field and nitrogen application rates (N 75~375 kg·hm-2) between,total nitrogen recovery rate of 50%straw returning to field and nitrogen application rates (N 75~375 kg·hm-2) between,0~100cm soil residual rate of 100%straw returning to field and nitrogen application rates (N 75~375 kg·hm-2) within a certain range.关键词
15N/华北平原/冬小麦/氮去向/化肥/土壤氮库/施氮量Key words
15N/north China plain/winter wheat/fate of nitrogen/fertilizer/soil nitrogen pool budget/nitrogen application rates分类
农业科技引用本文复制引用
倪玉雪,尹兴,刘新宇,巨晓棠,张丽娟..华北平原冬小麦季化肥氮去向及土壤氮库盈亏定量化探索[J].生态环境学报,2013,(3):392-397,6.基金项目
国家“十二五”粮食丰产科技工程资助 （）
