近年来，农工院/水保院佘冬立教授带领的水土资源高效利用与保护科研团队围绕沿海盐碱地土壤微观孔隙结构演变与水盐运移过程模拟开展了系列研究，并取得重要进展，其研究成果在土壤领域《Soil Tillage & Research》《European Journal of Soil Science》《Land Degradation & Development》以及应用数学领域《Chaos, Solitons & Fractals》等国际知名期刊发表。
沿海地区是我国重要的粮食产区，合理开发沿海土地可以缓解耕地短缺问题。由于沿海地区降雨蒸发过程强烈，加之海水入侵的影响，土壤干湿交替频繁，土壤结构演变与水土迁移过程具有鲜明特色，交互影响机制复杂。但土壤是一个“黑箱”，其内部可变的复杂微观孔隙结构和动态水文过程难以直接通过传统的物理技术和理论体系进行直接观测和定量化描述。该系列成果通过融合CT扫描和图像处理技术，结合分形几何学和波动分析法等理论方法，直观展示了土壤三维孔隙结构的演变规律，阐明了土壤孔隙结构的复杂性及其来源，并采用数学方法模拟预测了土壤水力性质及水盐运移过程。该系列研究可为沿海地区盐碱地水土资源高效利用与保护提供理论支撑，相关成果2023年获得“第十五届中国水土保持科学技术奖”二等奖。
研究工作得到了国家自然科学基金（51679062和41471180）、江苏省水利科技项目和江苏省自然资源科技项目等项目的支持。
论文信息：
Sun Xiaoqin, She Dongli*, Sanz Ernesto, Juan J. Martin-Sotoca, Ana M. Tarquis, Gao Lei. Multifractal analysis on CT soil images: Fluctuation analysis versus mass distribution[J]. Chaos, Solitons & Fractals, 2023, 176: 114080.
DOI: https://doi.org/10.1016/j.chaos.2023.114080
Sun Xiaoqin, She Dongli*, Fei Yuanhang, Han Xiao, Gao Lei. An improved pore-solid fractal model for predicting coastal saline soil hydraulic properties based on changepoints determined by genetic algorithm-support vector regression[J]. Soil and Tillage Research, 2022, 224: 105502.
DOI : https://doi.org/10.1016/j.still.2022.105502
Sun Xiaoqin, She Dongli*, Wang Hongde, Fei Yuanhang, Gao Lei. Modelling soil hydraulic properties with an improved pore‐solid fractal (PSF) model through image analysis[J]. European Journal of Soil Science, 2022, 73(1): e13156.
DOI : https://doi.org/10.1111/ejss.13156
Sun Xiaoqin, She Dongli*, Fei Yuanhang, Wang Hongde, Gao Lei. Three-dimensional fractal characteristics of soil pore structure and their relationships with hydraulic parameters in biochar-amended saline soil[J]. Soil and Tillage Research, 2021, 205: 104809.
DOI : https://doi.org/10.1016/j.still.2020.104809
Fei Yuanhang, She Dongli*, Gao Lei, et al. Micro-CT assessment on the soil structure and hydraulic characteristics of saline/sodic soils subjected to short-term amendment[J]. Soil and Tillage Research, 2019, 193: 59-70.
DOI : https://doi.org/10.1016/j.still.2019.05.024
Fei Yuanhang, She Dongli*, Yi Jun, Sun, Xiaoqin, Han Xiao, Liu Dongdong, Liu Muxing, Zhang Hailin. Roles of soil amendments in the water and salt transport of coastal saline soils through regulation of microstructure[J]. Land Degradation & Development, 2024, 35(7), 2382–2394.
DOI: https://doi.org/10.1002/ldr.5066
图1 土壤孔隙结构可视化
图2 土壤微观孔隙结构复杂性分析和水分运动建模
