Grouping tree species to estimate afforestation-driven soil organic carbon sequestration
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Grouping tree species to estimate afforestation-driven soil organic carbon sequestration Guolong Hou & Claudio O. Delang & Xixi Lu & Lei Gao
Received: 5 June 2020 / Accepted: 17 August 2020 # Springer Nature Switzerland AG 2020
Abstract Aims Any grouping of tree species concerned with SOC sequestration should include trees that are as homogeneous as possible in their carbon sequestration. We propose a classification of tree species into deciduous broadleaf, evergreen broadleaf, deciduous conifer and evergreen conifer and assess the validity of such classification. Methods We conducted a quantitative review of 264 observations from 90 papers. One-way analysis of variance and hierarchical multiple regression were performed to test the homogeneity within the tree types and the extent to which the tree classifications could
Responsible Editor: Zucong Cai. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11104-020-04685-z) contains supplementary material, which is available to authorized users. G. Hou : C. O. Delang (*) Department of Geography, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, China e-mail: [email protected] X. Lu Inner Mongolia Key Lab of River and Lake Ecology, Inner Mongolia University, Hohhot 010021, China X. Lu Department of Geography, National University of Singapore, 1 Arts Link, Kent Ridge, Singapore 117570, Singapore L. Gao School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China
affect the SOC stock change, after controlling for temperature, precipitation, stand age, initial SOC stock and previous land use. Results There is less variation in the SOC sequestration rates of tree types if they are grouped as deciduous broadleaf, evergreen broadleaf and evergreen conifer rather than evergreen and deciduous, or broadleaf and conifer. Evergreen broadleaf accumulates SOC at the fastest rate (0.73 Mg ha−1 yr−1), compared to deciduous broadleaf (0.42 Mg ha−1 yr−1) and evergreen conifer (0.48 Mg ha−1 yr−1). The proposed classification may help researchers to better estimate the changes in SOC stocks after afforestation with various tree species, when direct measurements are not available. Conclusions Our proposed classification of tree species is more accurate than the more commonly used groups of deciduous and evergreen or broadleaf and conifers. Keywords Tree classification . Tree physiology . Soil organic carbon . Deciduous broadleaf . Evergreen broadleaf . Evergreen conifer
Introduction Afforestation is viewed as an effective method to sequester atmospheric carbon and alleviate global warming (Bonan 2008). 58% of the carbon sequestered from the atmosphere by forests end up as soil carbon and litter (Pan et al. 2011). Trees play an important role in soil organic carbon (SOC) sequestration, because forest litter (aboveground and
Plant Soil
belowground) is the major component of soil organic matter (Cornwell et al. 2008; De Deyn et al. 2008; Cotrufo et al. 2015; Olsson et al. 2019). However, the ex
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