微咸水离子组成对膜下滴灌土壤孔隙结构的影响

胡行路; 张体彬; 张通港; 程煜; 刘祯媛; 梁青; 冯浩

胡行路,张体彬,张通港,程煜,刘祯媛,梁青,冯浩.微咸水离子组成对膜下滴灌土壤孔隙结构的影响[J].干旱地区农业研究,2024,(3):173~181

微咸水离子组成对膜下滴灌土壤孔隙结构的影响

Effects of brackish water cation compositions on soil pore structure under submembrane drip irrigation

DOI：10.7606/j.issn.1000-7601.2024.03.19

中文关键词: 土壤孔隙结构 CT扫描技术微咸水灌溉阳离子组成

英文关键词:soil pore structure CT scanning technology brackish water irrigation cation composition

基金项目:国家重点研发计划项目（2023YFD2001404）；陕西省重点研发计划项目（重点产业创新链）（2023-ZDLNY-53）；中国科学院“西部之光”人才培养计划项目（XAB2022YW04）

作者	单位
胡行路	中国科学院教育部水土保持与生态环境研究中心,陕西杨凌 712100；中国科学院水利部水土保持研究所,陕西杨凌712100；中国科学院大学,北京 100049
张体彬	中国科学院教育部水土保持与生态环境研究中心,陕西杨凌 712100；中国科学院水利部水土保持研究所,陕西杨凌712100；中国科学院大学,北京 100049
张通港	西北农林科技大学水利与建筑工程学院,陕西杨凌 712100
程煜	西北农林科技大学水利与建筑工程学院,陕西杨凌 712100
刘祯媛	西北农林科技大学水利与建筑工程学院,陕西杨凌 712100
梁青	西北农林科技大学水利与建筑工程学院,陕西杨凌 712100
冯浩	中国科学院教育部水土保持与生态环境研究中心,陕西杨凌 712100；中国科学院水利部水土保持研究所,陕西杨凌712100；中国科学院大学,北京 100049

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中文摘要:

为探讨不同阳离子组成微咸水灌溉对膜下土壤孔隙结构的影响，开展2a田间定位试验，设置当地地下水灌溉（CK）、NaCl微咸水灌溉（T1）、KCl微咸水灌溉（T2）、CaCl₂微咸水灌溉（T3）、MgCl₂微咸水灌溉（T4）5个处理，利用CT扫描技术研究不同阳离子组成微咸水对土壤孔隙结构的影响。结果表明：与CK处理相比，随灌水次数增多，添加Na⁺处理的土壤大孔隙度显著降低，添加K⁺、Ca²⁺、Mg²⁺处理的土壤大孔隙度显著增加，2022年添加Na⁺处理的大孔隙度平均降低了44.49%，添加K⁺、Ca²⁺、Mg²⁺处理的土壤大孔隙度平均分别增加了5.73%、80.73%、25.75%；在2021—2022年期间，与CK相比，4种不同阳离子处理土壤孔隙成圆率均呈增加趋势，其中添加Ca²⁺、Mg²⁺处理增加显著，土壤孔隙成圆率平均增加区间分别为25.52%~30.94%、17.46%~23.19%；连续灌溉2a之后，添加Na⁺和K⁺处理的土壤开裂程度加重，土壤稳定性变差，而添加Ca²⁺和Mg²⁺对改善土壤结构、提高土壤入渗性能作用明显。

英文摘要:

To explore the effects of brackish water irrigation with different cation compositions on soil pore structure under mulch, a two\|year field location experiment was conducted. The treatments included local ground water irrigation (CK), NaCl brackish water irrigation (T1), KCl brackish water irrigation (T2), CaCl₂ brackish water irrigation (T3) and MgCl₂ brackish water irrigation (T4). The effects of brackish water with different cation compositions on soil pore structure were studied by CT scanning technology. The results showed that: Compared with CK treatment, with the increase of irrigation times, the soil macroporosity of Na⁺ treatment was significantly decreased, and the soil macroporosity of K⁺, Ca²⁺ and Mg²⁺ treatments was significantly increased. In 2022, the soil macroporosity of Na⁺ treatment decreased by 44.49% on average, and the soil macroporosity of K⁺, Ca²⁺ and Mg²⁺ treatments increased by 5.73%, 80.73% and 25.75%, respectively. During 2021 and 2022, compared with CK treatment, the soil pore rounding rate of the four different cation treatments showed an increasing trend, among which the soil pore rounding rate of Ca²⁺ and Mg²⁺ treatments increased significantly, and the average increase range of soil pore rounding rate was 25.52%~30.94% and 17.46%~23.19%, respectively. After continuous irrigation for two years, the soil cracking degree of Na⁺ and K⁺ treatments was aggravated, and the soil stability was becoming worse and worse, while the soil structure and infiltration performance of soil were improved obviously by adding Ca²⁺ and Mg²⁺ treatments.

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