土壤容重对蓄水坑灌入渗及水氮分布的影响

发布时间：2018-04-19 07:26

本文选题：蓄水坑灌 + 土壤容重　；参考：《节水灌溉》2017年10期

【摘要】：为探讨土壤容重对蓄水坑灌入渗和水氮分布的影响,试验采用30°扇柱体有机玻璃土箱,高120 cm,半径100 cm,设置3个土壤容重水平:1.3、1.4、1.47 g/cm3。通过室内入渗试验,研究了土壤容重对肥液入渗、含水率分布、铵态氮和硝态氮含量的影响。结果表明:蓄水坑灌条件下,累积入渗量随土壤容重的增大而减小,不同容重下累积入渗量与入渗时间之间均符合Kostiakov入渗模型。随土壤容重的增大,湿润体范围逐渐减小,在分布1 d内,0~60cm深度土壤体积含水率随土壤容重的增大而增大。土壤铵态氮含量随土壤容重的增大在不同径向方向上变化不一致。不同容重下深层湿润锋处土壤硝态氮的累积量为:1.47 g/cm31.4 g/cm31.3 g/cm3。
[Abstract]:In order to study the effect of soil bulk density on irrigation infiltration and water nitrogen distribution in water storage pit, 30 掳fan columnar organic glass soil box with a height of 120 cm and a radius of 100 cm was used to set up three soil bulk density levels: 1. 1. 3, 1. 4 and 1. 47 g / cm ~ (3) 路cm ~ (3).The effects of soil bulk density on the infiltration of fertilizer solution, the distribution of moisture content, the content of ammonium nitrogen and nitrate nitrogen were studied in laboratory.The results showed that the cumulative infiltration decreased with the increase of soil bulk density under the condition of water storage pit irrigation, and the relationship between cumulative infiltration amount and infiltration time under different bulk density was in accordance with Kostiakov infiltration model.With the increase of soil bulk density, the range of moist body gradually decreased, and the soil volume moisture content increased with the increase of soil bulk density within 1 day.The content of soil ammonium nitrogen varied with the increase of soil bulk density in different radial directions.The accumulation of nitrate in the soil at the deep wetting front under different bulk weights was: 1: 1.47 g/cm31.4 g/cm31.3 / cm ~ (3).
【作者单位】：太原理工大学水利科学与工程学院;
【基金】：国家自然科学基金项目(51409184) 山西省青年科技研究基金项目(201601D202070) 高等学校博士学科点专项科研基金项目(20130402110008) 太原理工大学校基金项目(2013Z071) 企事业合作项目(ZNGZ2015-036)
【分类号】：S152

【相似文献】