The article describes a new modelling approach and module for soil salinity management. The two major objectives of the module are to simulate the seasonal course of the salinity of the soil solution in the active root zone of drip-irrigated crops to assist irrigators to optimise irrigation and salt leaching, and to help evaluate the salt fluxes in the deep percolating water for assessing the longer-term salt load of the irrigated crops on the regional ground and surface water resources. The module is based on the solutions of the DIDAS program for quasi-steady water flow and uptake for various drip irrigation scenarios, and on differentiating the applied water to evaporation from the soil surface, uptake by the plant roots, deep percolation through the root zone that leaches salt out of it, and deep percolation outside of the root zone that does not leach salts. After laying out the rationale behind the suggested approach and outlining the expressions used in the module for evaluating the salinity of the root zone, several sample computations, in silico experiments, are performed to illustrate the module functionality and its potential application, and to serve for sensitivity analysis of the system parameters. Additional investigation is needed into the adequacy of the suggested modelling approach and the developed module to simulate soil salinity in the active root zone.

本文介绍了一种用于土壤盐分管理的新建模方法和模块。该模块的两个主要目标是模拟滴灌作物活动根区土壤溶液盐度的季节性过程，以帮助灌溉者优化灌溉和盐浸，并帮助评估深部的盐通量。渗滤水用于评估灌溉作物对区域地下水和地表水资源的长期盐负荷。该模块基于 DIDAS 程序的解决方案，用于各种滴灌场景的准稳态水流和吸收，以及区分应用水与土壤表面蒸发、植物根部吸收、根区深层渗透从中滤出盐分，根区外的深层渗透，不会浸出盐分。在阐述了建议方法背后的基本原理并概述了模块中用于评估根区盐度的表达式后，进行了几个样本计算，进行计算机模拟实验以说明模块功能及其潜在应用，并用于系统参数的灵敏度分析。需要对建议的建模方法和开发的模块的充分性进行进一步调查，以模拟活动根区的土壤盐度。