Carbon quality and soil microbial property control the latitudinal pattern in temperature sensitivity of soil microbial respiration across Chinese forest ecosystems

Global Change Biology
Qingkui WangPeng Tian

Abstract

Understanding the temperature sensitivity (Q10 ) of soil organic C (SOC) decomposition is critical to quantifying the climate-carbon cycle feedback and predicting the response of ecosystems to climate change. However, the driving factors of the spatial variation in Q10 at a continental scale are fully unidentified. In this study, we conducted a novel incubation experiment with periodically varying temperature based on the mean annual temperature of the soil origin sites. A total of 140 soil samples were collected from 22 sites along a 3,800 km long north-south transect of forests in China, and the Q10 of soil microbial respiration and corresponding environmental variables were measured. Results showed that changes in the Q10 values were nonlinear with latitude, particularly showing low Q10 values in subtropical forests and high Q10 values in temperate forests. The soil C:N ratio was positively related to the Q10 values, and coniferous forest soils with low SOC quality had higher Q10 values than broadleaved forest soils with high SOC quality, which supported the "C quality temperature" hypothesis. Out of the spatial variations in Q10 across all ecosystems, gram-negative bacteria exhibited the most importance in regulating the va...Continue Reading

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Citations

Aug 20, 2019·Environmental Science and Pollution Research International·Shutao Chen, Jing Wu
Dec 19, 2018·Environmental Science and Pollution Research International·Xiaojie WangRenduo Zhang
Aug 5, 2020·Nature Communications·Carlos A GuerraNico Eisenhauer
Sep 14, 2019·Global Change Biology·Jinquan LiChangming Fang
Apr 15, 2021·Environmental Science & Technology·Xiaomeng WeiYakov Kuzyakov
Dec 11, 2021·The Science of the Total Environment·Bingwei ZhangChengjin Chu

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