Impact of Irrigation on Soil Water Balance and Salinity at the Boundaries of Cropland, Wasteland and Fishponds under a Cropland–Wasteland–Fishpond System

Agronomy Pub Date : 2024-09-16 DOI:10.3390/agronomy14092110
Cuicui Yu, Haibin Shi, Qingfeng Miao, José Manuel Gonçalves, Xu Dou, Zhiyuan Hu, Cong Hou, Yi Zhao, Hua Zhang
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Abstract

In order to explore the effect of fishponds on soil water, salt transport and salinization in cropland wasteland, a study on soil water balance and salt distribution pattern in a cropland–wasteland–fishpond system was carried out in 2022–2023 in a typical study area selected from the Yichang Irrigation Area of the Hetao Irrigation District. A water balance model was established for the cropland–wasteland–fishpond system to analyze the effects of irrigation on soil salinity at the boundaries of the cropland, wasteland, and fishpond. The results showed that the lateral recharge from the cropland to the wasteland during spring irrigation in 2022 was 24 mm, the lateral recharge generated by fishponds to wasteland was 18 mm, and the lateral recharge from fishponds to fishpond boundaries was 34 mm. In the fertility period of 2023, the lateral recharge from cropland to wasteland was 15 mm, the lateral recharge from fishponds to wasteland was 9 mm, and the lateral recharge from fishponds to fishpond boundaries was 21 mm. Due to the low salinity content of fishpond water, it diluted the groundwater of the wasteland, and the soil salinity at the boundary between the wasteland and the fishpond was monitored. The data show that the soil salinity at the boundary of the fishpond was smaller than that of the wasteland, which indicates that the migration of fishpond water to the wasteland will not lead to an increase in the soil salinity of the wasteland, but rather to a decrease in the soil salinity of the wasteland. Fishpond regulation has a significant impact on soil and groundwater, and when the topographic conditions of the Hetao irrigation area allow, the model of cropland–wasteland–fishpond can be appropriately adopted to solve land degradation and increase the economic income of farmers; the results of the study provide a contribution for the improvement of the management of land use and soil salinization in the Hetao irrigation area.
灌溉对耕地-荒地-鱼塘系统中耕地、荒地和鱼塘边界土壤水分平衡和盐度的影响
为探讨鱼塘对耕地荒地土壤水分、盐分迁移和盐渍化的影响,2022-2023 年,在河套灌区宜昌灌区典型研究区开展了耕地-荒地-鱼塘系统土壤水分平衡与盐分分布模式研究。建立了耕地-荒地-鱼塘系统的水平衡模型,分析了灌溉对耕地、荒地和鱼塘边界土壤盐分的影响。结果表明,2022 年春灌期间,耕地向荒地的侧向补给量为 24 毫米,鱼塘向荒地的侧向补给量为 18 毫米,鱼塘向鱼塘边界的侧向补给量为 34 毫米。在 2023 年的生育期,耕地向荒地的侧向补给为 15 毫米,鱼塘向荒地的侧向补给为 9 毫米,鱼塘向鱼塘边界的侧向补给为 21 毫米。由于鱼塘水含盐量低,稀释了荒地的地下水,因此对荒地与鱼塘边界的土壤盐度进行了监测。数据显示,鱼塘边界的土壤盐度小于荒地的土壤盐度,这表明鱼塘水迁移到荒地不会导致荒地土壤盐度增加,反而会降低荒地的土壤盐度。鱼塘调节对土壤和地下水有重要影响,在河套灌区地形条件允许的情况下,可适当采用耕地-荒地-鱼塘模式解决土地退化问题,增加农民经济收入;研究结果为改善河套灌区土地利用和土壤盐碱化管理做出了贡献。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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