Institute of Agricultural Resource and Environment, Jilin Academy of Agricultural Sciences/Key Laboratory of Crop Ecophysiology and Farming System in Northeast China, Ministry of Agriculture and Rural Affairs, Changchun 130033, China.
Ying Yong Sheng Tai Xue Bao. 2023 Jul;34(7):1853-1861. doi: 10.13287/j.1001-9332.202307.027.
We examined the effects of different tillage practices on plough layer soil structure and organic carbon stabilization in black soil farmland with a long-term positioning platform. The wet-sieving method and infrared spectroscopy method were used to investigate the impacts of conventional tillage (CT), no-tillage (NT), sub-soiling tillage (ST), and moldboard plowing tillage (MP) on soil aggregates distribution and organic carbon characteristics in 0-40 cm soil layers. Compared to CT, both NT and ST treatments significantly increased the proportion of large macroaggregates (>2 mm) in the topsoil layer (0-20 cm)and that of small macroaggregates (0.25-2 mm) in the subsoil layer (20-40 cm) for NT, ST, and MP. NT, ST, and MP treatments resulted in higher mean weight dia-meter (MWD) and mean geometric diameter (GMD) of soil aggregates in both the topsoil and subsoil layers. NT treatment improved organic carbon contents in bulk soil and large macroaggregates in the topsoil layer, while ST and MP enhanced organic carbon contents in bulk soil and large macroaggregates in the subsoil layer. The contribution rate of small macroaggregates organic carbon content to the total was between 68.9% and 83.4%. Furthermore, the organic carbon chemical stabilization of soil body and aggregates increased in the topsoil and subsoil layers under NT treatment compared to others. The MWD had a positive correlation with the organic carbon content and chemical stability of soil body and small macroaggregates. These findings offered a theoretical basis for understanding the impacts of different tillage practices on the stability of soil aggregate and organic carbon in black soil region.
我们利用长期定位试验平台，研究了不同耕作措施对黑土农田耕层土壤结构和有机碳稳定的影响。采用湿筛法和红外光谱法，研究了常规耕作（CT）、免耕（NT）、深松耕作（ST）和铧式犁耕（MP）对 0-40 cm 土层土壤团聚体分布和有机碳特征的影响。与 CT 相比，NT 和 ST 处理均显著增加了表层（0-20 cm）土壤中大团聚体（>2 mm）和亚表层（20-40 cm）中小团聚体（0.25-2 mm）的比例；NT、ST 和 MP 处理均增加了表层和亚表层土壤团聚体的平均重量直径（MWD）和平均几何直径（GMD）。NT 处理提高了表层土壤团聚体和整土有机碳含量，ST 和 MP 处理则提高了亚表层土壤团聚体和整土有机碳含量。小团聚体有机碳含量对总有机碳的贡献率在 68.9%~83.4%之间。此外，与其他处理相比，NT 处理增加了土壤和团聚体的有机碳化学稳定性。MWD 与土壤和小团聚体的有机碳含量及化学稳定性呈正相关。这些发现为理解不同耕作措施对黑土区土壤团聚体和有机碳稳定性的影响提供了理论依据。
