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同步辐射微CT(SRμ-CT)可以无损获取高分辨率、强对比度的内部结构图像,是研究土壤团聚体三维微结构的有效手段。本研究采集了种植水稻20a和40a后表层土壤团聚体样品,应用SRμ-CT扫描获取了9μm分辨率的团聚体内部结构图像,然后应用CT图像处理方法和3DMA-Rock软件观察并定量分析了团聚体微结构特征。随着种植水稻年限的增加,土壤有机质含量和全氮含量显著增加,团聚体孔隙数量和孔隙度显著增加,比表面积显著增大。种植水稻20a的土壤团聚体呈现致密的黏闭结构,而种植水稻40a的土壤团聚体具有由团粒状小团聚体构成的复杂多孔微结构。结果表明随着种植年限的增加,团聚体微结构和土壤质量明显改善。
Synchrotron radiation micro-CT (SRμ-CT) is an effective method to study the three-dimensional micro-structure of soil aggregates without loss of high-resolution, strong contrast internal structure. In this study, samples of surface soil aggregates from rice cultivars 20a and 40a were collected. The internal structure of aggregates with 9μm resolution was obtained by SRμ-CT scanning. Then the aggregates were observed and quantified using CT image processing and 3DMA-Rock software Body microstructure characteristics. With the increase of years of planting rice, soil organic matter content and total nitrogen content increased significantly, the number of aggregate pores and porosity significantly increased, the specific surface area increased significantly. Soil aggregates that grew paddy rice 20a exhibited a dense, closed structure, whereas soil aggregates that grew paddy rice40a had complex porous microstructures composed of small aggregates of aggregates. The results showed that with the increase of planting years, the microstructure and soil quality of aggregates improved obviously.