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Root effects on the temperature sensitivity of soil respiration depend on climatic condition and ecosystem type

Author:
Li, Jinquan, Pendall, Elise, Dijkstra, Feike A., Nie, Ming
Source:
Soil & tillage research 2020 v.199 pp. 104574
ISSN:
0167-1987
Subject:
Earth system science, climatic factors, cold zones, cropland, forest ecosystems, grasslands, models, rhizosphere, roots, soil, soil respiration, temperature
Abstract:
Root activity may alter the temperature sensitivity (Q₁₀) of soil respiration. However, we lack a comprehensive understanding of root effects on Q₁₀ across different climatic regions and ecosystem types. Here, we conducted a global synthesis of 87 observations of Q₁₀ values of soil respiration and its components from 40 published studies. We found that roots significantly enhanced Q₁₀ of soil respiration because root and rhizosphere respiration was more temperature-sensitive than the respiration of root-free soil, especially in cold regions (mean annual temperature <10 °C). Moreover, roots significantly enhanced Q₁₀ of soil respiration in grassland and cropland but not in forest ecosystems. Overall, our results suggest that the positive effects of roots on Q₁₀ largely depend on climatic condition and ecosystem type, and are potentially useful for parameterizing and benchmarking biogeochemical and Earth system models.
Agid:
6814866