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. 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 affect the SOC stock change, after controlling for temperature, precipitation, stand age, initial SOC stock and previous land use. 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. Our proposed classification of tree species is more accurate than the more commonly used groups of deciduous and evergreen or broadleaf and conifers.

中文翻译：

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对树种进行分组以估计造林驱动的土壤有机碳固存

任何与 SOC 固存相关的树种分组都应包括碳固存方面尽可能均质的树木。我们建议将树种分为落叶阔叶树、常绿阔叶树、落叶针叶树和常绿针叶树，并评估这种分类的有效性。我们对 90 篇论文中的 264 个观察结果进行了定量审查。在控制温度、降水、林龄、初始 SOC 储量和先前的 SOC 储量后，进行单向方差分析和分层多元回归以检验树木类型内的同质性以及树木分类对 SOC 储量变化的影响程度。土地利用。如果将树木归类为落叶阔叶树，则它们的 SOC 封存率变化较小，常绿阔叶树和常绿针叶树，而不是常绿落叶树或阔叶树和针叶树。与落叶阔叶树 (0.42 Mg ha-1 yr-1) 和常绿针叶树 (0.48 Mg ha-1 yr-1) 相比，常绿阔叶树以最快的速度 (0.73 Mg ha-1 yr-1) 积累 SOC。当无法直接测量时，提议的分类可以帮助研究人员更好地估计不同树种造林后 SOC 储量的变化。我们提出的树种分类比更常用的落叶和常绿或阔叶和针叶树类群更准确。当无法直接测量时，提议的分类可以帮助研究人员更好地估计不同树种造林后 SOC 储量的变化。我们提出的树种分类比更常用的落叶和常绿或阔叶和针叶树类群更准确。当无法直接测量时，提议的分类可以帮助研究人员更好地估计不同树种造林后 SOC 储量的变化。我们提出的树种分类比更常用的落叶和常绿或阔叶和针叶树的分类更准确。