| 引用本文: | 张 辉,高子安,李希臣,等.咸水替代对滨海盐碱地干旱胁迫小麦幼苗
生长及土壤性质的影响[J].灌溉排水学报,2026,45(5):10-18. |
| ZHANG Hui,GAO Zian,LI Xichen,et al.咸水替代对滨海盐碱地干旱胁迫小麦幼苗
生长及土壤性质的影响[J].灌溉排水学报,2026,45(5):10-18. |
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| 摘要: |
| 【目的】探明小麦苗期遭遇干旱胁迫后，采用咸水替代淡水灌溉保苗所允许的最大安全替代比例。【方法】以黄河三角洲轻度盐渍土为研究对象，通过盆栽试验，设置8个处理：常量淡水（CK1）、干旱处理+全量淡水（CK2）、干旱处理+1/6咸水替代（W1处理）、干旱处理+1/3咸水替代（W2处理）、干旱处理+1/2咸水替代（W3处理）、干旱处理+2/3咸水替代（W4处理）、干旱处理+5/6咸水替代（W5处理）、干旱处理+咸水替代（W6处理），研究不同咸水替代比例对小麦生长及土壤特性的影响。【结果】①与淡水处理（CK2）相比，咸水替代淡水1/6（W1处理）、1/3（W2处理）、1/2（W3处理）时小麦株高、茎粗、根冠比、根表面积、土壤脲酶、蔗糖酶和过氧化氢酶活性无显著差异；②当咸水替代淡水2/3（W4处理）、5/6（W5处理）和1（W6处理）时显著抑制了小麦生长性状（鲜质量、干质量、根系总长度、投影面积、面积、根尖数）和生理性状（水分利用效率、叶绿素量、叶片谷胱甘肽量、过氧化物酶和超氧化物歧化酶活性）；③土壤含盐量随咸水替代比例增加而持续上升，咸水替代淡水2/3（W4处理）以上时土壤含盐量较淡水处理（CK2）显著增加了64.93%以上。【结论】综上所述，咸水替代淡水比例越大，对小麦生长的抑制作用越明显，土壤理化性质恶化越严重。综合考虑灌溉水矿化度对小麦及土壤的影响，咸水替代淡水1/2（W3处理，矿化度为6.81 g/L）可作为咸水替代比例的上限。 |
| 关键词: 咸水替代；滨海盐碱地；干旱胁迫；小麦生长；土壤盐渍化 |
| DOI：10.13522/j.cnki.ggps.2025322 |
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| Effects of partially substituting freshwater with saline water in irrigation on wheat seedlings and soil properties of coastal saline-alkali soils under drought |
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ZHANG Hui, GAO Zian, LI Xichen, CHAO Ying, LOU Yanhong, ZHUGE Yuping,
HAN Fei, LI Yaping, WANG Hui, PAN Hong, YANG Quangang
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1. Colleges of Resources and Environment, Shandong Agricultural University, Tai’an 271018, China; 2. Gaomi Agricultural Technology Promotion Center, Weifang 261502, China; 3. Tai’an Hi-tech Industrial Development Zone, Tai’an 271000, China
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| Abstract: |
| 【Objective】In arid and semi-arid regions of the Yellow River Delta, where freshwater is scarce and saline water is abundant, partially substituting freshwater with saline water in irrigation is a potential strategy for agriculture. However, excessive use of saline water negatively affects crops and soil health. This study experimentally investigated the safe limit saline water substitution ratio for irrigating wheat seedlings.【Method】The experiment was conducted in pots filled with a moderately saline soil collected from the Yellow River Delta. It consisted of eight treatments: sufficient irrigation with freshwater (CK1), water stress + irrigation with freshwater (CK2), and water stress + substituting 1/6 (W1), 1/3 (W2), 1/2 (W3), 2/3 (W4), 5/6 (W5), and 6/6 (W6) of the freshwater used in CK2. During the experiment, the growth and physiological traits of the wheat seedlings, as well as soil properties were measured in each treatment.【Result】①Compared with CK2, treatments W1, W2 and W3 did not show significant differences in plant height, stem diameter, root-shoot ratio, root surface area, and the activities of urease, sucrase and catalase. ②Treatments W4, W5 and W6 not only resulted in significant decreases in fresh and dry weight, total root length, root projected area, root surface area, and root tip number, but also reduced water use efficiency, chlorophyll content, leaf glutathione content, and the activities of peroxidase and superoxide dismutase.③Soil salt content increased as the saline water substitution ratio increased. Compared with CK2, W4–W6 increased the soil salt content by more than 64.93%.【Conclusion】Increasing the saline water substitution ratio in irrigation resulted in a significant decrease in wheat growth and deterioration of soil properties. Considering the combined effects of saline water on wheat and soil, substituting less than one-half of freshwater with saline water is the save limit for irrigating wheat seedlings. |
| Key words: saline water substitution; Coastal Saline-alkali Land; drought stress; wheat growth; soil salinization |
