标题：Controls and variability of soil respiration temperature sensitivity across China

入藏号：WOS:000991762400001

中国科学院文献情报中心期刊分区：环境科学与生态学1区TOP（2023）

本校作者： 杨知涵；罗新蕊；施月红；周涛；罗可；赖云森；余朋；刘亮；唐晓鹿*

来源出版物：SCIENCE OF THE TOTAL ENVIRONMENT  卷: 871  文献号: 161974

出版年：2023

第一地址： 成都理工大学

关键词：Soil respiration; Temperature sensitivity; Soil organic carbon; Vegetation activity

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摘要：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.

文章链接地址: https://www.sciencedirect.com/science/article/pii/S0048969723005892?via%3Dihub