| 孙泽强,康跃虎,刘海军.喷灌冬小麦农田土壤NO-3-N分布特征及作物吸氮规律[J].干旱地区农业研究,2007,(6):136~143 |
| 喷灌冬小麦农田土壤NO-3-N分布特征及作物吸氮规律 |
| Effects of sprinkler irrigation on soil nitrate-N distribution and nitrogen uptake of winter wheat under the field conditions |
| |
| DOI：10.7606/j.issn.1000-7601.2007.06.28 |
| 中文关键词: 喷灌 冬小麦 土壤NO-3-N 作物吸氮 |
| 英文关键词:sprinkler irrigation winter wheat soil NO-3-N plant nitrogen uptake |
| 基金项目:国家杰出青年基金(40125002) |
|
| 摘要点击次数: 339 |
| 全文下载次数: 285 |
| 中文摘要: |
| 以传统地面灌溉(畦灌)为对照,2002~2003和2003~2004两个生产年度田间试验分析喷灌对冬小麦农田土壤NO-3-N分布和作物吸氮的影响。试验结果表明:喷灌与地面灌溉相比,土壤NO-3-N含量峰值迁移较浅,土壤NO-3-N主要分布在冬小麦主要根系分布层040 cm土层内。与喷灌相比,在冬小麦根系层下部,地面灌溉土壤NO-3-N存在不同程度的累积。试验期间地面灌溉土壤NO-3-N累积淋失量分别为8.68 kg/hm2和7.70 kg/hm2,喷灌条件下没有明显的土壤NO-3-N淋失,最大累积淋失量只有地面灌溉条件下的3%。2003和2004年喷灌冬小麦地上部分吸氮量分别为235.7 kg/hm2和161.7 kg/hm2,分别比地面灌溉高7.0 kg/hm2和34.7kg/hm2。与地面灌溉相比,喷灌有利于冬小麦后期吸收氮素,喷灌不同生育期冬小麦吸氮量年际之间的差异都小于地面灌溉。 |
| 英文摘要: |
| The effects of sprinkler irrigation on soil nitrate-N distribution and nitrogen uptake of winter wheat were analyzed through two-year field experiments.The control treatment was traditional surface irrigation(border irrigation). The experimental results indicate that the peak of soil nitrate-N transports shallowly and distributes mainly within upper 40 cm soil layers where most roots of winter wheat distribute under sprinkler irrigation compared with under surface irrigation.In the sublayer of root zone of winter wheat,soil nitrate-N cumulates under surface irrigation in various degrees compared with under sprinkler irrigation.The accumulation of soil nitrate-N leached are 8.68 kg/hm2 and 7.70 kg/hm2 under surface irrigation in 2003 and 2004,respectively.The accumulation of soil nitrate-N leached under sprinkler irrigation is very small,about less than 3% of surface irrigation conditions.The amount of nitrogen uptake by winter wheat under sprinkler irrigation is 235.7 kg/hm2 and 161.7 kg/hm2 in two years,7.0 kg/hm2 and 34.7 kg/hm2 higher than that under surface irrigation,respectively.Sprinkler irrigation has the promoting effects on nitrogen uptake by winter wheat in the later period.The difference of nitrogen uptake by winter wheat during different growing periods between each year under sprinkler irrigation is all smaller than that under surface irrigation. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| | |