肥液浓度对双点源涌泉根灌土壤入渗特征及水分运移的影响  

Effect of Fertilizer Concentration on Soil Infiltration Characteristics and Water Transport Under Double Point Source in Bubbled-root Irrigation

作　　者：张俊 缑丽娜 何振嘉 肖欣怡 梁飞 任虎兴 傅渝亮 ZHANG Jun;GOU Li-na;HE Zhen-jia;XIAO Xin-yi;LIANG Fei;REN Hu-xing;FU Yu-liang(Shaanxi Provincial Land Engineering Construction Group Co.,Ltd,Xi´an 710075,China;School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450045,China)

机构地区：[1]陕西省土地工程建设集团有限责任公司,西安710075 [2]华北水利水电大学水利学院,郑州450045

出　　处：《节水灌溉》2023年第8期10-16,共7页Water Saving Irrigation

基　　金：国家自然科学基金项目(51779205)。

摘　　要：为探究不同肥液浓度对涌泉根灌双点源交汇入渗湿润体特性变化和水分运移规律的影响,在陕北榆林西北农林科技大学远志山试验基地,设置4个肥液浓度(质量浓度)(0、5、10和20g/L),开展了肥液浓度对土壤累积入渗量、土壤含水率影响的试验研究。结果表明:相同肥液浓度条件下,自由入渗处累积入渗量大于交汇入渗处累积入渗量,涌泉根灌交汇入渗累积入渗量随时间和肥液浓度变化存在显著的幂函数关系(R2>0.9,P<0.01)。采用Philip模型和Kosyiakov模型均能拟合双点源涌泉根灌入渗过程,肥液浓度越大,吸渗率S也越大,土壤的入渗能力越强。肥液浓度增加了双点源涌泉根灌的累积入渗量,与单点源涌泉根灌对比,双点源涌泉根灌累积入渗量有所减小,但交汇面土壤含水率有所提升。在双点源交汇入渗情况下,不同位置处土壤水分的变化差异小于自由入渗侧,而肥液浓度越大,交汇面处的湿润深度越深,土壤含水率大于自由入渗侧土壤含水率。在实际灌水过程中,肥液浓度过大将不利于水肥利用效率的提高。因此,在田间布设过程中,合理的双点源布置方式能更有效地提高涌泉根灌灌水器的灌水效率,同时提高水资源利用率。In order to explore the effects of different concentrations of fertilizer on the characteristics of wet body and the law of water migration during the interinfiltration of two point sources in bubbled-root irrigation,four fertilizer concentrations(mass concentrations)(0,5,10 and 20 g/L)were set up in Yuanzhishan test base of Northwest A&F University in northern Shaanxi Province to investigate the effects of fertilizer concentrations on soil cumulative infiltration and soil moisture content.The results showed that under the same concentration of fertilizer solution,the cumulative infiltration at free infiltration was greater than that at intersection infiltration,and the cumulative infiltration at bubbled-root irrigation intersection had a significant power function relationship with time and the concentration of fertilizer solution(R2>0.9,P<0.01).Both Philip model and Kosyiakov model could be used to fit the infiltration process of two-point bubbled-root irrigation.The higher the concentration of fertilizer solution,the higher the imbibition rate S,and the stronger the infiltration capacity of soil.The concentration of fertilizer liquid increased the cumulative infiltration of the two-point source surging bubbled-root irrigation.Compared with the single point source surging bubbled-root irrigation,the cumulative infiltration of the two-point source surging bubbled-root irrigation decreased,but the soil moisture content at the intersection increased.In the case of dual point source intersection infiltration,the variation difference of soil moisture at different locations was less than that at the free infiltration side,and the higher the concentration of fertilizer liquid,the deeper the moisture depth at the intersection surface,and the soil moisture content was greater than that at the free infiltration side.In the actual irrigation process,too large concentration of fertilizer will not be conducive to the improvement of water and fertilizer utilization efficiency.Therefore,in the process of field layout,a reason

关 键 词：涌泉根灌 肥液浓度 双点源交汇入渗 土壤水分 入渗特征 

分 类 号：S275.4[农业科学—农业水土工程]