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1.中国科学院教育部水土保持与生态环境研究中心,水土保持与荒漠化整治全国重点实验室,陕西 杨凌,712100
2.中国科学院水利部水土保持研究所,陕西 杨凌,712100
3.中国科学院大学,北京,100049
4.西北农林科技大学水利与建筑工程学院,陕西 杨凌,712100
Received:23 December 2025,
Revised:2026-01-20,
Accepted:16 February 2026,
Published:28 June 2026
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曹家仪,李金卓,胡亚鲜,等.冻融扰动对土壤孔隙水可溶性物质分布及紫外-荧光特性的影响[J].水土保持学报,2026,40(3):119-129.2026, 40(3):119-129.
CAO Jiayi, LI Jinzhuo, HU Yaxian, et al. Effects of freeze-thaw disturbance on distribution and UV⁃fluorescence characteristics of dissolved substances in soil pore water[J]. Journal of Soil and Water Conservation,
曹家仪,李金卓,胡亚鲜,等.冻融扰动对土壤孔隙水可溶性物质分布及紫外-荧光特性的影响[J].水土保持学报,2026,40(3):119-129.2026, 40(3):119-129. DOI: 10.13870/j.cnki.stbcxb.2026.03.040. CSTR: 32310.14.stbcxb.2026.03.040.
CAO Jiayi, LI Jinzhuo, HU Yaxian, et al. Effects of freeze-thaw disturbance on distribution and UV⁃fluorescence characteristics of dissolved substances in soil pore water[J]. Journal of Soil and Water Conservation, DOI: 10.13870/j.cnki.stbcxb.2026.03.040. CSTR: 32310.14.stbcxb.2026.03.040.
目的
2
季节性冻融可深刻改变土壤孔隙结构,但目前对孔隙水中可溶性物质含量与组分的变化了解非常有限。
方法
2
选取典型季节性冻融区东北黑土为研究对象,通过室内冻融控制性模拟试验,借助高速冷冻离心机和紫外分光光度计,对比分析3种不同粒径(细粒径
<
0.5 mm、中粒径0.5~2.0 mm和粗粒径2.0~5.0 mm)回填环刀土样,分别在冻融前、后5个不同基质吸力水平下收集测定所得土壤孔隙水的电导率(EC)、可溶性有机碳含量(DOC),以及可溶性有机物紫外-荧光特性(HIX、FI、SUVA
254
)。
结果
2
1)冻融后,各粒径土样≥34.0 μm大孔隙占比均显著下降(4.84%),而0.4~3.0、
<
0.4 μm的微孔隙占比增加(5.45%、2.78%)。2)随着当量孔径缩小,DOC、EC和HIX均降低,且冻融后均有增高趋势。3)细粒径组成土样在0.4~3.0 μm微孔径的孔隙水SUVA
254
在冻融后显著增强,而粗粒径几乎所有孔径孔隙水的SUVA
254
均显著下降。
结论
2
冻融作用不仅可显著改变土壤孔隙结构,还可深刻影响土壤孔隙水分布及可溶性有机物组分,强调北方季节性冻融扰动对来年春季土壤物理结构和生物化学特性的深远影响。
Objective
2
Seasonal freeze-thaw can profoundly alter soil pore structure, but current understanding of the changes in the content and composition of dissolved substances in pore water remains very limited.
Methods
2
This study selected the black soil of Northeast China from a typical seasonal freeze-thaw region as the research subject. Through controlled laboratory freeze-thaw simulation experiments, utilizing a high-speed refrigerated centrifuge and UV spectrophotometer, this study conducted a comparative analysis of three different particle sizes (fine particles
<
0.5 mm, medium particles 0.5-2.0 mm, and coarse particle
s 2.0-5.0 mm) repacked in cutting rings. Soil pore water was collected and measured at five different matric suction levels to determine its electrical conductivity (EC), dissolved organic carbon (DOC) content, and UV-fluorescence characteristics of dissolved organic matter (HIX, FI, SUVA
254
) before and after freeze-thaw.
Results
2
1) After freeze-thaw, the proportion of macropores ≥ 34.0 μm significantly decreased (4.84%) in soil samples of all particle size fractions, while the proportions of micropores (0.4-3.0 μm and
<
0.4 μm) increased (5.45% and 2.78%, respectively). 2) As the equivalent pore diameter decreased, DOC, EC, and HIX all decreased, exhibiting an increasing trend after freeze-thaw. 3) For fine-grained soil samples, the SUVA
254
of pore water in the micropores of 0.4-3.0 μm increased significantly after freeze-thaw, whereas for coarse-grained samples, the SUVA
254
of pore water in almost all pore sizes decreased significantly.
Conclusion
2
Freeze-thaw action can not only significantly alter soil pore structure but also profoundly influence the distribution of soil pore water and the composition of dissolved organic matter. It underscores the far-reaching impact of seasonal freeze-thaw disturbance in northern regions on soil physical structure and biogeochemical properties in the following spring.
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