Abstract
The temperature sensitivity (Q10) of heterotrophic soil respiration (RH) of forests affects terrestrial carbon (C) dynamics under climate change. However, the effects of changed chemistry of tree leaf litter (referred to as litter hereafter) under elevated atmospheric CO2 concentrations ([CO2]) on the Q10 of RH has not been explored. To fill the knowledge gap, the Q10 of RH was investigated through incubation experiments at three temperature levels using litters of pine (Pinus densiflora Siebold & Zucc.) and oak (Quercus variabilis Blume) that were produced under ambient ([CO2]a) and elevated ([CO2]e) [CO2]. Regardless of [CO2] conditions, pine litter had higher lignin but lower nonstructural carbohydrate (NSC), calcium (Ca), and manganese (Mn) concentrations than oak, suggesting that pine litter has inherently poor chemistry. [CO2]e increased the ratios of lignin-to-nitrogen (lignin/N; by 58 and 122% for pine and oak, respectively) and C-to-N (C/N; by 47 and 125%, respectively) of litter through decreasing litter N concentration. For soils amended with [CO2]a-litter, Q10 was greater for pine (1.54) than oak (1.39) litters in agreement with the kinetic theory on the substrate quality-Q10 relationship. However, amending [CO2]e-litter decreased Q10 for pine (1.44) but marginally increased Q10 for oak (1.44). The decreased Q10 for pine by [CO2]e could be attributed to the inherently poor litter chemistry (e.g., high lignin, and low NSC, Ca, and Mn concentrations). Our study shows that the changed litter chemistry by [CO2]e modifies Q10 of RH of litter-amended soils.
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Funding
This work was carried out with the support of the “Cooperative Research Program for Agriculture Science and Technology Development (Project No. PJ015010022020),” Rural Development Administration, Republic of Korea. HJP received a post-doctoral fellowship from the National Research Foundation of Korea (NRF-2020R1A6A3A03039306).
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Hyun-Jin Park: investigation, data curation, writing – original draft, visualization. Young-Jae Jeong: investigation. Bo-Seong Seo: investigation. Woo-Jung Choi: supervision, funding acquisition, writing – review and editing. Scott X. Chang: conceptualization, writing – review and editing.
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Park, HJ., Jeong, YJ., Seo, BS. et al. Temperature sensitivity of microbial respiration of soils amended with pine and oak litters is affected by tree growing CO2. Biol Fertil Soils 58, 827–834 (2022). https://doi.org/10.1007/s00374-022-01648-7
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DOI: https://doi.org/10.1007/s00374-022-01648-7