Li Xiangdong,Zheng Caixue,Dang Feifei,et al.Effects of straw addition and leaching on aggregate structure of saline-alkaline soils[J].Research of Soil and Water Conservation,2025,32(04):84-91.[doi:10.13869/j.cnki.rswc.2025.04.042]
秸秆添加与淋洗对盐碱土团聚体结构的影响
- Title:
- Effects of straw addition and leaching on aggregate structure of saline-alkaline soils
- 文章编号:
- 1005-3409（2025）04-0084-08
- Keywords:
- straw addition; leaching; aggregate stability; aggregate pore structure; CT scanning; saline-alkaline soils
- 分类号:
- S156.4
- 文献标志码:
- A
- 摘要:
- [目的]探究有机物添加和淋洗等混合措施对盐碱化土壤团聚体稳定性和孔隙结构的影响，为盐碱化土壤改良和综合治理提供科学依据。[方法]通过土柱培养试验，设置秸秆添加、淋洗处理、淋洗-秸秆共同处理以及对照组4个处理，结合显微CT扫描、图像处理技术和室内理化分析技术，探讨秸秆添加和淋洗处理措施对盐碱土盐分和团聚体结构改良的效益。[结果]（1）秸秆单独添加对土壤电导率和可溶性盐分含量无显著影响，淋洗和淋洗-秸秆组显著降低31.1%和33.5%土壤可溶性盐分总量；10—20cm土层土壤电导率和可溶性盐分含量高于0—10cm土层。（2）土壤团聚体以<0.25mm微团聚体为主；除单独秸秆添加和淋洗处理降低10—20cm土壤团聚体平均重量直径外，秸秆添加和淋洗处理对团聚体平均重量直径、几何平均直径、土壤颗粒分形维数以及土壤团聚体孔隙度、孔隙数量、孔隙直径、孔隙分形维数、孔隙球形度和连通度等指标均无显著性影响。（3）土壤盐分指标、团聚体稳定性指标和团聚体孔隙结构指标间无显著性相关关系。[结论]秸秆与淋洗对盐碱土团聚体结构影响较小，节水灌溉背景下应关注秸秆添加量和灌水总量在不同地区的适应性以及亚表层土壤盐分累积问题，同时综合评估长时间尺度下多种改良措施对盐碱土土壤盐分、养分和团聚体结构等指标的综合改良效益。
- Abstract:
- [Objective] This study aims to explore the effects of organic matter addition and leaching on the stability and pore structure of aggregates in saline-alkaline soils, providing a scientific basis for the improvement and comprehensive management of saline-alkaline soils. [Methods] Soil column incubation experiments were conducted with four treatments： straw addition, leaching, leaching combined with straw addition, and a control group. Using micro-CT scanning, image processing technology, and laboratory physicochemical analysis, the effects of straw addition and leaching on the salinity and aggregate structure of saline-alkaline soils were studied. [Results](1) Straw addition alone had no significant effect on soil conductivity or soluble salt content. The treatments of leaching and leaching combined with straw addition significantly reduced the total soluble salt content by 31.1% and 33.5%, respectively. Soil conductivity and soluble salt content in the 10—20 cm soil layer were higher than in the 0—10 cm soil layer.(2) Soil aggregates were mainly microaggregates smaller than 0.25 mm. The treatments of straw addition alone and leaching did not have significant effects on the mean weight diameter, geometric mean diameter, soil particle fractal dimension, or the pore structure characteristics of aggregates(including porosity, pore number, pore diameter, pore fractal dimension, pore sphericity and connectivity), with the exception of reducing the mean weight diameter of aggregates in the 10—20 cm soil layer.(3) No significant correlation was found between soil salinity, aggregate stability, and aggregate pore structure characteristics. [Conclusion] The effects of straw addition and leaching on the aggregate structure of saline-alkaline soils are minimal. In the context of water-saving irrigation, attention should be given to the adaptability of straw addition amount and total irrigation volume in different regions, as well as salt accumulation in the subsoil layers. Additionally, a comprehensive evaluation of the long-term benefits of various improvement measures on soil salinity, nutrients, and aggregate structure in saline-alkaline soils should be conducted.
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备注/Memo
收稿日期：2024-07-30 修回日期：2024-12-30 接受日期：2025-01-13
资助项目：延安大学博士科研启动项目（YDBK2022-100，YDBK2022-43）；榆林市科技计划项目（2023-CXY-212）
第一作者：李祥东（1990—），男，山东枣庄人，讲师，研究方向为土壤物理学。E-mail：xdli@yau.edu.cn
通信作者：毛娜（1993—），女，陕西商洛人，副教授，研究方向为土壤碳氮循环。E-mail：maona0110@163.com