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Effects of root diameter and root nitrogen concentration on in situ root respiration among different seasons and tree species

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Ecological Research

Abstract

Knowledge of root respiration is a prerequisite for a better understanding of ecosystem carbon budget and carbon allocation. However, there are not many relevant data in the literature on direct measurements of in situ root respiration by root chamber method. Furthermore, few studies have been focused on the effects of root diameter (D r) and root nitrogen concentration (N r) on in situ root respiration among different seasons and tree species. To address these goals, we used a simplified root-chamber system to measure in situ root respiration rates of Acacia crassicarpa and Eucalyptus urophylla in subtropical plantations of south China. We found that the species and season variation in root respiration were affected by D r and N r. Also, the root respiration per unit dry mass (R r, nmol CO2 g−1 s−1) and root respiration per unit N (R n, nmol CO2 g N−1 s−1) were affected by D r and N r. The R r, R n, N r and soil temperature sensitivity (Q 10) of R r for the two species significantly decreased with an increase of D r. The R r of the two species showed significant an inter-seasonal and diurnal pattern, and this trend decreased with increasing D r. Both the R r and Q 10 of the two species increased with increasing N r. The D r and N r explained 54 and 52% of the observed variation in R r for A. crassicarpa, and 65 and 70% for E. urophylla. The R r, N r, and Q 10 of A. crassicarpa were significantly higher than those of E. urophylla. Our results indicated that root respiration was dependent on D r and N r, and this dependence varied with season and plant species.

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Acknowledgments

This work was financially supported by a key project of the National Science Foundation of China (30630015), Knowledge Innovation Program of the Chinese Academy of Sciences (KZCX2-YW-413), and the “100 Elites Project” of the Chinese Academy of Sciences. We thank the editor and two anonymous reviewers for their insightful comments. We also thank Profs. Karl Auerswald, Lehrstuhl für Grünlandlehre, Technische Universität München, for polishing the language and for providing comments on the manuscript.

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  1. Institute of Ecology, South China Botanical Garden, Chinese Academy of Sciences, Xingke Road 723, Tianhe District, Guangzhou, 510650, China

    Dima Chen, Lixia Zhou, Xingquan Rao, Yongbiao Lin & Shenglei Fu

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  1. Dima Chen
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Correspondence to Shenglei Fu.

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Chen, D., Zhou, L., Rao, X. et al. Effects of root diameter and root nitrogen concentration on in situ root respiration among different seasons and tree species. Ecol Res 25, 983–993 (2010). https://doi.org/10.1007/s11284-010-0722-2

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