How a Root-Microbial System Regulates the Response of Soil Respiration to Temperature and Moisture in a Plantation
Jun Li 3
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College of Forestry, Beijing Forestry University, Beijing, China
Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing, China
Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
Submission date: 2017-08-31
Final revision date: 2017-12-09
Acceptance date: 2017-12-17
Online publication date: 2018-05-24
Publication date: 2018-07-09
Corresponding author
Wenchen Song   

College of Forestry, Beijing Forestry University, Beijing Forestry University, 100083 Beijing, China
Pol. J. Environ. Stud. 2018;27(6):2749-2756
Understanding the response of soil respiration to changes in temperature and moisture is critical to accurately assess the impact of afforestation on regional carbon balance. In order to investigate the response of soil respiration to soil temperature and moisture, we partitioned soil respiration into three components (heterotrophic respiration, root respiration, and rhizomicrobial respiration) using 13C natural abundance during the growing season in a Robinia pseudoacacia plantation in northern China. Root respiration and soil microbial respiration had a significantly positive relationship with soil temperature. Heterotrophic respiration was positively correlated with soil moisture, while rhizomicrobial respiration significantly decreased with a reduction in soil moisture. Our findings suggest that the responses of plant roots and soil microorganisms to soil temperature and moisture were different. According to the prediction of the rootmicrobial model developed in this study, average soil respiration will increase by 12 mg C m-2 h-1 when soil temperature increases by 2ºC in the plantation. By modelling the relationship of a root-microbial system during the growing season in a plantation in northern China, the temperature and moisture sensitivities of soil respiration can be characterized.
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