Effect of Compost Addition on Carbon Mineralization and Kinetic Characteristics in Three Typical Agricultural Soils

作者：Shanglong Zhang, Xianni Chen, Aoxue Shi, Minggang Xu, Fenggang Zhang, Lu Zhang, Jiaojiao Zang, Xiaofeng Xu, Jiakai Gao · 发表于：Agronomy · 年份：2025 · DOI：10.3390/agronomy15071559 · 被引用次数：11 · 研究领域：Soil Carbon and Nitrogen Dynamics

Soil carbon is a crucial component of the global carbon cycle, and carbon mineralization is influenced by various factors. However, there is a lack of systematic analyses on the responses of carbon mineralization in different soil types to the addition of exogenous organic matter. This study investigates the effects of compost addition on the mineralization and kinetic characteristics of soil carbon across three typical agricultural soils: paddy soil, black soil, and cinnamon soil. A 210-day incubation study was conducted with four treatments: Control (un-amended soil), R (soil + straw), R1M (soil + straw + low compost application rate), R2M (soil + straw + high compost application rate). The results showed that the CO2 emission rates of the three soils were higher during the early stage (1–37 days) and decreased afterward. The CO2 emission rates of the paddy soil and the black soil were significantly higher than those of the cinnamon soil. The addition of compost significantly increased both the CO2 emission rate and the cumulative release of CO2, especially in the R2M treatment. At the end of the incubation, the SOC contents were higher in the R2M treatment than in the Control for all three soils (p < 0.05), with the most notable increase in the cinnamon soil (60.93%). Compost addition significantly enhanced the active carbon pool (Ca), slow carbon pool (Cs), and potentially mineralizable carbon pool (Cp), while decreasing the mineralization rate (ka) of the Ca, but the ...