| 摘要: |
| 【目的】从非常规水资源化利用角度出发，探究盐渍化灌区农田排水变化规律，为灌区排水资源化利用提供基础支撑。【方法】基于河套灌区2006—2020年排水量和排水矿化度，应用Mann-Kendall趋势检验法分析了研究区解放闸、永济及义长灌域排水量和排水矿化度时空分布特征和变化趋势，采用Spearman相关分析研究了3个灌域年排水量和排水矿化度关系。【结果】时间分布上，研究区3个灌域2006—2020年排水量均呈上升趋势；解放闸灌域排水矿化度呈平稳态势，永济和义长灌域排水矿化度呈下降趋势；3个灌域的年排水量和排水矿化度的相关系数ρ分别为-0.02、-0.81、-0.81，解放闸灌域的月排水量和排水矿化度弱负相关，永济和义长灌域的月排水量和排水矿化度高度负相关；各灌域月排水量和排水矿化度变化显著。空间分布上，义长灌域年排水量大，解放闸灌域次之，永济灌域相对较小，其值分别为2.492亿、1.897亿、1.305亿m3；永济和义长灌域年排水矿化度在2014年之前高于解放闸灌域，之后均低于解放闸灌域。【结论】盐渍化灌区排水资源化利用应在综合考虑排水量与排水矿化度基础上，结合不同地区种植作物耐盐性、土壤特性等采取适宜的分级利用方式，以便达到排水资源的最优利用。 |
| 关键词: 盐渍化灌区；Mann-Kendall趋势分析；排水量；矿化度；资源化利用 |
| DOI：10.13522/j.cnki.ggps.2024381 |
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| 基金项目: |
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| Spatiotemporal variations of drainage water and its salinity in the Hetao Irrigation District |
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HUANG Yongjiang, BAI Fangfang
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1. Inner Mongolia Agricultural University Institute of Water Conservancy and Civil Engineering, Hohhot 010018, China;
2. Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
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| Abstract: |
| 【Objective】The Hetao Irrigation District, the largest irrigation district in Inner Mongolia, relies primarily on water diverted from the Yellow River. However, long-term irrigation has led to increasing soil salinization. This study aims to analyze the spatiotemporal variations in drainage volume and mineralization within the district to inform sustainable drainage water reuse strategies.【Method】The analysis was based on drainage water and its mineralization measure from 2006 to 2020 in the irrigation district. The Mann-Kendall trend test was applied to assess the spatiotemporal variations in both drainage volume and mineralization across three irrigation areas: Jiefangzha, Yongji, and Yichang. Additionally, the Spearman correlation coefficient was used to evaluate the relationship between annual drainage volume and mineralization in each area.【Result】From 2006 to 2020, all three irrigation areas exhibited a significant increasing trend in drainage volume. Mineralization levels remained stable in the Jiefangzha area, while both Yongji and Yichang area experienced a significant decrease in mineralization. The Spearman correlation coefficients between annual drainage volume and mineralization were -0.02 for Jiefangzha and -0.81 for both Yongji and Yichang, indicating a strong negative correlation of drainage volume and mineralization in the latter two areas. Monthly data further revealed significant variations in drainage volume and mineralization, generally displaying a negative correlation. Spatially, the highest average annual drainage volume was recorded in Yichang (2.492 hundred million m3), followed by Jiefangzha (1.897 hundred million m3) and Yongji (1.305 hundred million m3). Notably, before 2014, mineralization levels in Yongji and Yichang were higher than those in Jiefangzha; however, this trend reversed after 2014.【Conclusion】Effective reuse of drainage water in the Hetao Irrigation District requires a comprehensive evaluation of both drainage volume and mineralization. Region-specific strategies that consider crop salt tolerance and local soil properties are essential for optimizing the sustainable utilization of drainage resources. |
| Key words: salinized irrigation area; Mann-Kendall trend analysis; drainage volume; mineralization; resource utilization |
