Abstract
Partitioning of soil CO2 flux (FS) into autotrophic and heterotrophic components depends on how the plant carbon is allocated above- vs. belowground and how the belowground carbon is allocated for respiration and production of roots and their microbial associations. Data of litterfall (FA), root respiration (FR), and FS of world old-growth or mature forests (≥45 ages) were compiled, and the relationship between carbon allocation above- vs. belowground (indexed as the FA/FS ratio) and FS partitioning (indexed as the FR/FS ratio) was examined. The FA/FS ratio ranged from 0.08 to 0.64 and was positively correlated with mean annual air temperature and mean annual precipitation. The ratio increased from boreal to temperate to tropical forests, and was higher in broadleaved forests than in coniferous forests. Site-specific belowground carbon use efficiency (BCUE, root production per unit carbon used by roots and microbial associations) varied from 0.10 to 0.87, contrasting with the common assumption of a constant BCUE. Site-specific FR/FS ranged from 0.09 to 0.71 and increased with FS due to a decrease in BCUE. Deciduousness had a significant effect on the FR/FS ratios, with FR/FS ratios greater in deciduous forests than in evergreen forests. Methods of separating root respiration from soil heterotrophic respiration had a significant effect on estimated FR/FS. The estimated FR/FS ratio was negatively related to the FA/FS ratio, indicating that factors favouring carbon allocation belowground over aboveground will increase the autotrophic contribution to total soil respiration. The relatively low explaining power (r 2 = 0.270) of this relationship resulted from deviations from assumptions of constant BCUE and a near steady-state belowground pools.
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This work was funded by the National Natural Science Foundation of China (No. 30972347) and the Natural Science Foundation of Fujian Province (No. 2008J0124).
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Chen, Gs., Yang, Ys., Guo, Jf. et al. Relationships between carbon allocation and partitioning of soil respiration across world mature forests. Plant Ecol 212, 195–206 (2011). https://doi.org/10.1007/s11258-010-9814-x
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DOI: https://doi.org/10.1007/s11258-010-9814-x