Summary
Context Saline‒alkali cropland exhibits high soil salinity and low carbon content levels, leading to deterioration in soil physical and chemical properties. Aims This study aimed to test the effects of tillage methods on soil organic carbon (SOC) functional groups and the CO2 distribution in the maize canopy. Methods The experimental design used two tillage methods: subsoiling (ST) and rotary tillage (RT). The physical and chemical properties of soil, as well as the CO2 concentration in the canopy, were analyzed during the anthesis, filling, and mature stages of maize. Key results In the 0–20 cm soil layer, the salt, total carbon, SOC, soil inorganic carbon (SIC), alkyl carbon, and alkoxy carbon contents under RT increased by 2.67%, 8.36%, 9.78%, 7.47%, 14.41%, and 2.85%, respectively, com
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