数字农科院2.0

Soil sample size and physical properties matter in experimental studies of the moisture and temperature response of soil respiration

文献类型： 外文期刊

作者： Zhongyang Li;Yuan Liu;Pengfei Huang;Chuncheng Liu;Zhifeng Yan;Xiaoxian Zhang;Andrew L. Neal

作者机构：

关键词： Anaerobic CO2 production;Incubation;Modelling;Physical processes;Soil respiration;Soil structure

期刊名称： Soil Biology and Biochemistry

ISSN： 0038-0717

年卷期： 2025 年 208 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： The influence of soil water and temperature on soil respiration is often studied using incubation experiments due to the challenges associated with field measurements. While incubations preserve most chemical and biological properties of the soil, they alter the physical environment. A critical issue is whether these alterations make incubation results unrepresentative of those under field conditions. To address this gap, we developed a multiscale model to explicitly resolve key processes, which include heterogeneous microbial distribution and O2 dissolution and diffusion, controlling anaerobic CO2 production and microbial respiration of dissolved and gaseous O2 in the pore space. These processes are integrated into a macroscopic model to simulate CO2 emissions in soil profiles. We applied the model to published incubation and field experiments to evaluate its accuracy and ability to predict the moisture and temperature sensitivity of CO2 emissions. The model was then used to investigate how physical factors often overlooked in incubation experiments, such as soil depth, porosity and alteration of soil structure, impact the moisture and temperature response of CO2 emissions. Our results show that incubations substantially overestimate the temperature sensitivity of CO2 emissions compared to that under field conditions, due to changes in the physical environment. Modifying soil structure also alters the moisture and temperature response of CO2 emissions. These findings demonstrate the role of physical factors in regulating CO2 emissions and underscore the need for caution when extrapolating incubation results to field conditions or using them to predict the response of soil carbon dynamics to global warming.

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