A field investigation on the tilled layer soil in Nanjing region revealed two distinctive types of soil structures: machinery-till related and biological related structures. The former was featured with relatively large-scale disintegrated soil clods,having a negative effect on corn root development, the later was characterized with the presence of bio-channels. The spatial topological relations among soil particles, encompassing different scales from primary soil particles to relatively large-scale soil clods as a result from tillage operations, were defined as soil macro-structures. Soil macro-structure brought forward a scope that was not to be coped with agricultural or chemical approaches. Soil tillage affects soil macro-structure, which further affects soil biological performances in different scales.
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丁启朔,丁为民,孟为国,韩英.耕作力学研究中的土壤结构表现与评价[J].农业机械学报,2007,38(8):62-66.[J]. Transactions of the Chinese Society for Agricultural Machinery,2007,38(8):62-66.