Controls and variability of soil respiration temperature sensitivity across China

Zhihan, Y.; Xinrui, L.; Yuehong, S.; Tao, Z.; Ke, L.; Yunsen, L.; Peng, Y.; Liang, L.; Alexander, O.; Ben, B.; Dalei, H.; Jinshi, J.; Shaohui, F.; Chunju, C.; Xiaolu, T.

Авторы: Zhihan Yang, Xinrui Luo, Yuehong Shi, Tao Zhou, Ke Luo, Yunsen Lai, Peng Yu, Liang Liu, Alexander Olchev, Ben Bond-Lamberty, Dalei Hao, Jinshi Jian, Shaohui Fan, Chunju Cai, Xiaolu Tang
Журнал: Science of the Total Environment
Том: 871
Год издания: 2023
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Номер статьи: 161974
DOI: 10.1016/j.scitotenv.2023.161974
Аннотация: Understanding the temperature sensitivity (Q10) of soil respiration is critical for benchmarking the potential intensity of regional and global terrestrial soil carbon fluxes-climate feedbacks. Although field observations have demonstrated the strong spatial heterogeneity of Q10, a significant knowledge gap still exists regarding to the factors driving spatial and temporal variabilities of Q10 at regional scales. Therefore, we used a machine learning approach to predict Q10 from 1994 to 2016 with a spatial resolution of 1 km across China from 515 field observations at 5 cm soil depth using climate, soil and vegetation variables. Predicted Q10 varied from 1.54 to 4.17, with an area-weighted average of 2.52. There was no significant temporal trend for Q10 (p = 0.32), but annual vegetation production (indicated by normalized difference vegetation index, NDVI) was positively correlated to it (p < 0.01). Spatially, soil organic carbon (SOC) was the most important driving factor in 62 % of the land area across China, and varied greatly, demonstrating soil controls on the spatial pattern of Q10. These findings highlighted different environmental controls on the spatial and temporal pattern of soil respiration Q10, which should be considered to improve global biogeochemical models used to predict the spatial and temporal patterns of soil carbon fluxes to ongoing climate change.
Добавил в систему: Ольчев Александр Валентинович

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Controls and variability of soil respiration temperature sensitivity across Chinaстатья

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