| 摘要: |
| 采用室内模拟、盆栽、微区和田间试验相结合的方法，系统研究了土壤水分在提高氮肥肥效中的作用机制。结果表明：①在一定土壤水分含量范围内，随土壤含水量增加ＮＨ4+—Ｎ硝化速率增加；②在根系不干扰土体养分的情况下，较高的土壤含水量可加快肥料氮向根系迁移；③良好的土壤水分有利于植物吸收氮素；④水分能促使氮素向籽粒转移，改善籽粒对茎叶的比值，从而增加了玉米的经济学产量，最终反映为土壤水分增高可提高氮肥的增产效果。 |
| 关键词: 土壤水分，氮肥肥效，春玉米 |
| DOI： |
| 分类号:S152.75 |
| 基金项目: |
|
| Operational Mechanism of Soil Water on Improving Nitrogen Efficiency |
|
Wang Xiqing Li Shengxu Gao Yajun
|
| Abstract: |
| Incubation experiment,pot experiment,micro-plot experiment and field
experiment were conducted in order to study systematically operational mechanism of
siol water on improving nitrogen efficiency.The result showed as follows:①the NH4+—N nitrification rate increased with the soilwater content rise in a given range;②the
higher soil water content contributed to the transport of fertilizer—N with out interfering the soil nutrient distribution of root system;③sufficient soil water benefited the nutrients uptake by shoots;④the soil water condition could improve harvest index, finally
the soil water content could result in the increase of N efficiency. |
| Key words: soil water,N efficiency,spring maize |
