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首页> 外文期刊>Agricultural Water Management >Solute transport in a loamy soil under subsurface porous clay pipe irrigation.
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Solute transport in a loamy soil under subsurface porous clay pipe irrigation.

机译：地下多孔粘土管灌溉下壤土中的溶质运移。

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摘要

Subsurface porous clay pipe irrigation is widely considered to be a very promising method for small-scale irrigation in arid regions. Unfortunately, salt accumulation at and near the soil surface using this method may affect germination of direct-seeded crops. Predicting salt movement and accumulation with clay pipe irrigation will allow producers to anticipate the need for leaching to control salinity in the soil root zone. The HYDRUS-2D model was used to simulate the accumulation of salt from a subsurface clay pipe irrigation system, installed at 30 cm depth, during the growing season of okra (Abelmoschus esculentus) irrigated with water having a salinity of 1.1 dS m-1. The loamy soil profile had an initial salinity of 2.3 dS m-1. Predicted electrical conductivity (ECe) values at the end of the growing season correlated significantly (R2=0.952) with measured saturated paste ECe data obtained at the end of the field experiments. Salinity was found to be relatively low around the pipes, but increased with distance away from the pipes. Measured and predicted soil salinity levels were especially higher above the clay pipes. Our results indicate that proper management of salt accumulation is vital for sustainable crop production whenever subsurface irrigation systems are being implemented.
机译：地下多孔黏土管灌溉被广泛认为是干旱地区小规模灌溉的一种很有前途的方法。不幸的是，使用这种方法在土壤表面及其附近的盐分累积可能会影响直接播种农作物的发芽。利用粘土管灌溉来预测盐分的移动和积累，使生产者可以预期需要进行沥滤以控制土壤根部盐分的盐分。 HYDRUS-2D模型用于模拟秋葵（Abelmoschus esculentus）的生长季节中的盐分1.1 dS m -1 。壤质土壤剖面的初始盐度为2.3 dS m -1 。生长季节结束时的预测电导率（EC e ）值与测量的饱和糊状EC e 显着相关（R 2 = 0.952）。现场实验结束时获得的数据。发现管道周围的盐度相对较低，但随着与管道之间距离的增加而增加。测得的和预测的土壤盐度水平尤其高于粘土管。我们的结果表明，每当实施地下灌溉系统时，对盐分累积的适当管理对于作物的可持续生产至关重要。

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