1. Relationship between basal soil respiration and the temperature sensitivity of soil respiration and their key controlling factors across terrestrial ecosystems.
- Author
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Chen, Shutao, Zhang, Miaomiao, Zou, Jianwen, and Hu, Zhenghua
- Subjects
SOIL respiration ,SOIL temperature ,CARBON cycle ,LEAF area index ,DECIDUOUS forests ,ECOSYSTEMS ,SOIL depth ,TUNDRAS - Abstract
Purpose: The purposes of this study are to characterize the relationship between basal soil respiration at 0 °C (R
0 ) and the temperature sensitivity (Q10 ) of soil respiration and climate, soil, and vegetation factors and to establish R0 and Q10 models. Materials and methods: We compiled R0 and Q10 and variables (i.e., climate factors, soil properties, and vegetation characteristics) that were measured in various terrestrial ecosystems. Results and discussion: The results showed that both R0 and Q10 could generally be fitted by a normal distribution curve across various ecosystems, but they varied greatly among the different ecosystems. The lowest median R0 and Q10 appeared in the desert, while the highest median R0 and Q10 appeared in the deciduous broad-leaf forest and deciduous needle-leaf forest ecosystems, respectively. The relationship between R0 and Q10 across different soil depths varied among the different ecosystems, with the highest and lowest R2 occurring in the cropland (R2 = 0.701) and evergreen needle-leaf forest (R2 = 0.095), respectively. A model that included Q10 , fine root production and the ratio of soil organic carbon to total nitrogen (TN) explained 75.0% (R2 = 0.750) of the variation in R0 , with a P value less than 0.001. Q10 was further expressed as a model (R2 = 0.663, P < 0.001) including annual precipitation, mean air temperature, TN, bulk density, and leaf area index. Conclusions: Our R0 models can potentially be used to improve terrestrial carbon cycle models by considering the comprehensive effects of Q10 and soil and vegetation factors. [ABSTRACT FROM AUTHOR]- Published
- 2022
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