改良剂作用下盐碱土水盐运移试验研究
Experimental study on water and salt transport in saline soils under the action of amendments
蒙旭辉 1景何仿2
作者信息
- 1. 宁夏大学 土木与水利工程学院,宁夏 银川 750021
- 2. 北方民族大学 土木学院,宁夏 银川 750021
- 折叠
摘要
为研究不同改良剂对滴灌条件下盐碱土中水盐运移的影响,通过室内双点源土柱入渗试验,探究在相同滴头流量(0.3 L/h)不同改良剂条件下,土柱中湿润峰的变化及湿润体内水分和盐分的运移情况.研究结果表明:改良剂的添加对水分的减渗作用明显,尤其是采用施用量为 1.0 g/kg 的腐殖酸处理的土壤,垂直湿润锋最深到达距地表 11cm处,较不添加改良剂的对照组小了 9 cm;改良剂显著增加了湿润体平均体积含水率与脱盐率,与对照组相比,采用施用量为1.0 g/kg的腐殖酸处理的土壤湿润体平均体积含水率提高了 28%、脱盐率提高了 20%;采用施用量为1.0 g/kg的生物菌处理的土壤平均体积含水量提高了 4%、脱盐率提高了 15.1%.在相同滴头流量下,虽然经施用量为1.0 g/kg的腐殖酸处理的土壤湿润体平均体积含水量最高、脱盐率最好,但湿润体最小、脱盐范围最小且会产生地表积水,从而造成水分的浪费.综合来看,采用施用量为 1.0 g/kg的生物菌改良的土壤比较适合宁夏南梁农场种植油葵、玉米等扎根较深的耐旱作物.
Abstract
In order to study the effects of different amendments on water and salt transport in saline soil under drip irrigation conditions,this study used an indoor infiltration test with dual-point source soil column to investigate the change of the moisture peak in the soil column and the transport of wa-ter and salt within the wetting body under the conditions of different amendments with the same drip head flow rate(0.3 L/h).The results of the study showed that the addition of amendments had a sig-nificant effect on water infiltration reduction,especially in the soil treated with humic acid at an appli-cation rate of 1.0 g/kg,the deepest point that vertical wetting front reached is about 11 cm from the surface,which was 9 cm smaller than that of the control group without amendments.The amend-ments significantly increased the average volumetric water content and desalination rate of the wetting body.Compared with the control group,the average volumetric water content of soil moisture in-creased by 28%and the desalination rate increased by 20%when treated with humic acid at a dosage of 1.0 g/kg,while the average volumetric water content of the soil treated with 1.0 g/kg of biological bacteria increased by 4%and desalination rate increased by 15.1%.Under the same drip flow rate,although the average volumetric water content and the desalination rate of the soil wetted body treated with humic acid at 1.0 g/kg was the highest,the wetted body was the smallest,the range of desalina-tion was the smallest,and surface ponding occurred,which resulted in a waste of water.In summary,the soil amended with 1.0 g/kg of biofungus is more suitable for planting oil sunflower,corn and oth-er drought-tolerant crops with deep roots in Nanliang Farm,Ningxia.
关键词
盐碱土/双点源入渗/水盐运移/湿润体Key words
saline soils/dual-point source infiltration/water and salt transport/wetted bodies引用本文复制引用
基金项目
国家自然科学基金项目(11861003)
宁夏自然科学基金项目(2023AAC02049)
北方民族大学创新团队项目(2022PT_S02)
出版年
2024
NETL
NSTL
万方数据