Li Shuanhu, Li Chi, Yao De, Wang Xiaorong, Gao Yu
Key Laboratory of Geological Hazards and Geotechnical Engineering Defense in Sandy and Drought Regions at Universities of Inner Mongolia Autonomous Region, Inner Mongolia University of Technology, Hohhot, China; School of Civil Engineering, Inner Mongolia University of Technology, Hohhot, China.
Key Laboratory of Geological Hazards and Geotechnical Engineering Defense in Sandy and Drought Regions at Universities of Inner Mongolia Autonomous Region, Inner Mongolia University of Technology, Hohhot, China; School of Resource and Environmental Engineering, Inner Mongolia University of Technology, Hohhot, China.
Sci Total Environ. 2024 Apr 10;920:170834. doi: 10.1016/j.scitotenv.2024.170834. Epub 2024 Feb 10.
Agricultural irrigation areas around the world employ similar planting methods, but there are notable disparities in salinization mechanism and management strategies. Many scholars have focused on human activities as the main cause of secondary soil salinization, while neglecting the underlying issue of primary soil salinization caused by geological factors. This study takes the Hetao irrigation area in China as a case study, delving into the geological forces responsible for primary salinization. Using historical survey data on geological structure, lake evolution, and sedimentation to analyze the stratigraphic distribution and groundwater storage characteristic. Additionally, using groundwater hydrochemistry data from historical literatures to analyze the concentration, distribution patterns, and source issues of salt ions. The research results show that a novel concept called the "bowl effect" can explain the unique cause of primary salinization in Hetao irrigation area. The bowl effect effectively transforms Hetao irrigation area into an enclosed space, which significantly limits the movement of groundwater and hinders the dilution of highly saline or alkaline water. The bowl effect has broad applicability and can serve as a useful framework for studying primary salinization challenges in agricultural irrigation areas worldwide. This research provides a scientifically reference for selecting salinization control methods, and will benefit local stakeholders, government agencies, and water resource managers.
世界各地的农业灌溉区采用相似的种植方法，但在盐碱化机制和管理策略方面存在显著差异。许多学者将人类活动视为次生土壤盐碱化的主要原因，却忽视了地质因素导致的原生土壤盐碱化这一根本问题。本研究以中国河套灌区为例，深入探究导致原生盐碱化的地质作用力。利用地质构造、湖泊演化和沉积的历史调查数据，分析地层分布和地下水储存特征。此外，利用历史文献中的地下水水化学数据，分析盐离子的浓度、分布模式和来源问题。研究结果表明，一种名为“碗状效应”的新概念可以解释河套灌区原生盐碱化的独特成因。碗状效应有效地将河套灌区转变为一个封闭空间，这显著限制了地下水的流动，并阻碍了高盐碱水的稀释。碗状效应具有广泛的适用性，可为研究全球农业灌溉区的原生盐碱化挑战提供有用的框架。本研究为选择盐碱化控制方法提供了科学参考，将造福当地利益相关者、政府机构和水资源管理者。
