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模拟降水量对土壤水氮运移及氨挥发特性的影响

作者：

刘秋丽

单位：

山西省水利水电科学研究院

关键词：

模拟降水量;含水率;铵态氮;硝态氮;氨挥发

摘要：

为了解不同降水量对土壤氮素迁移的影响,通过室内土柱模型试验模拟不同降水量对土壤氮素运移及氨挥发的影响。结果表明:土壤含水率及其湿润深度随灌后模拟降水量的增加而增大。降水后铵态氮主要分布在垂向0～65cm土层范围内,呈先增大后减小的单峰曲线分布;0～35cm层深范围内,降水量越大同一土层位置处的铵态氮浓度越低,35cm以下反之。硝态氮随水运移并大量积聚在湿润锋处。降水量越大,湿润锋处硝态氮的浓度越大。模拟降水量0.3L、0.6L、0.9L较参照(灌后无降水)分别降低了51.71%、45.83%、58.24%的氨挥发损失。水肥灌施后适宜的降水量既能改变土壤氮的分布,又能降低土壤氮的氨挥发损失。

译名：

Simulating the effect of different precipitation on nitrogen transport and ammonia volatilization in soil

作者：

LIU Qiuli;Shanxi Water Resources and Hydropower Science Institute Research;

关键词：

simulated precipitation;;moisture content;;ammonium nitrogen;;nitrate nitrogen;;ammonia volatilization

摘要：

In order to understand the effect of different precipitation on nitrogen transport in soil, the effects of different it were simulated through indoor soil column model tests. The results showed that the soil moisture content and its wetting depth increased with the increase of simulated precipitation after irrigation. After precipitation, ammonium nitrogen is mainly distributed in the vertical soil layer from 0 to 65 cm, with a single peak curve that increases first and then decreases. In the depth range of between 0 and 35 cm, the higher the precipitation, the lower the ammonium nitrogen concentration in the same soil layer, and vice versa below 35 cm. Nitrate nitrogen moves along with water transport and accumulates largely at the wetting front. The greater the precipitation, the greater the concentration of nitrate nitrogen at the wetting front. The simulated precipitation of 0.3 L, 0.6 L and 0.9 L decreased ammonia volatilization by 51.71%, 45.83% and 58.24% respectively compared with the reference(no precipitation after irrigation). Appropriate precipitation after irrigation with water and fertilizer can not only change the distribution of soil nitrogen, but also reduce the ammonia volatilization loss of soil nitrogen.

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模拟降水量对土壤水氮运移及氨挥发特性的影响

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