中文摘要：

基于江西进贤长期定位试验田，采用上海光源的生物成像线站显微CT技术扫描3-5 mm土壤团聚体，获得分辨率为3.7 μm的切片图像，并运用3DMA_Rock软件进行数字图像处理，构建孔喉网络模型，定量研究了不同施肥条件下（CK、NPK、NPKOM）红壤性水稻土团聚体的三维微结构特征。结果表明：与CK处理相比，NPK处理的土壤孔隙度、比表面积、孔喉数量和平均路径长度等指标值分别下降了31.6%、28.8%、15.1%和12.6%，说明长期单施无机肥可导致土壤团聚体结构退化；而NPKOM处理则显著增加了以上的指标值（分别增加了77.6%、68.4%、182.8%和14.4%），说明长期无机有机肥配施能改善土壤团聚体的微结构，促进土壤团聚体的形成和稳定，使土壤保持良好的通透功能，提高土壤的肥力质量。

英文摘要：

In order to characterize 3-D microstructures of the soil aggregates in the paddy soil of a long-term fertilization experiment on red soil in Jinxian, Jiangxi Province, as affected by different patterns of fertilization （CK, NPK and NPKOM）, soil aggregates, 3-5 mm in diameter, collected from the paddy soil, were scanned with a micro-CT scanner at the Shanghai Synchrotron Radiation Facility （SSRF） for slice images, 3.7 μm in resolution, which were then processed with the 3DMA_Rock software into digital images for construction of a pore-throat network model. Results show that compared with CK, Treatment NPK decreased soil porosity, specific surface area, throat numbers, and average path length by 31.6%, 28.8%, 15.1% and 12.6%, respectively, while Treatment NPKOM increased them by 77.6%, 68.4%, 182.8% and 14.4%, respectively, demonstrating that long-term application of chemical fertilizer caused degradation of soil aggregate structure, whereas combined application of chemical fertilizer with organic manure significantly improved aggregate microstructure and promoted formation and stability of soil aggregates and the soil quality, thus keeping the soil in good aeration and permeability and building up soil fertility.