Abstract

This study investigated the effects of hydrological, agroecological, and soil-hydrophysical factors on the vertical subsurface flow within the vadose zone and groundwater (GW) recharge on the sand massifs in the Don Region. This involves issues of adapting lysimeter studies to field observations in investigations of the moisture transport dynamics in light-textured soils. Techniques for reconstruction of the main hydrophysical characteristics and the scaling were employed to simulate moisture transport under various initial and boundary conditions. Laboratory investigations were performed at the Hydrological Complex of the Federal Scientific Centre of Agroecology of the Russian Academy of Sciences; field studies were conducted on the Eterevsky sand massif in Volgograd Oblast. The reconstructed hydrophysical parameters and HYDRUS-1D program revealed the effects of different soil–plant conditions on GW recharge. The open sands have an inflow to GW throughout the year, which ensures a stable supply to the river systems. The grounds occupied by herbaceous plants and pine plantations on soils with low water holding capacity, are the supplementary source of GW recharge. The volume of the gravity flow from the vadose zone to GW was established to depend entirely on the biomass of the herbaceous plants on the sands and the quality (bonitet) of the forest plantations.

中文翻译：

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顿河地区沙地地下水形成模拟：以叶捷列夫斯基沙地为例

摘要

本研究调查了水文、农业生态和土壤水物理因素对包气带内垂直地下流和顿河地区沙地块地下水（GW）补给的影响。这涉及到在轻质土壤中的水分输送动力学研究中将蒸渗仪研究适应现场观察的问题。采用主要水物理特征重建和缩放技术来模拟各种初始和边界条件下的水分输送。实验室研究在俄罗斯科学院联邦农业生态科学中心水文综合体进行；在伏尔加格勒州的埃捷列夫斯基沙地进行了实地研究。重建的水物理参数和 HYDRUS-1D 程序揭示了不同土壤-植物条件对 GW 补给的影响。开阔的沙地全年都有水流入GW，这确保了河流系统的稳定供应。低持水能力土壤上的草本植物和松树种植园是 GW 补给的补充来源。从渗流区到 GW 的重力流体积完全取决于沙子上草本植物的生物量和人工林的质量 ( bonitet )。