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. 2022 Jan 7;12:772463. doi: 10.3389/fpls.2021.772463

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Copyright © 2022 Wang, Brunner, Wang, Guo, Geng, Yang, Chen, Han and Li.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Principal component analysis (PCA) of fine-root traits for Changbai Mountain (CBS), Maoershan (MES) and Xianrendong (XRD) forests. The 95% confidence ellipses are shown. FL, first-order fine-root length; FD, first-order fine-root diameter; FA, first-order fine-root area; FSRL, specific root length of first-order fine roots; SL, second-order fine-root length; SD, second-order fine-root diameter; SA, first-order fine-root area; SSRL, specific root length of second-order fine roots; BR, branching ratio; BI, branching intensity; FC, carbon content of first-order fine roots; FN; nitrogen content of first-order fine roots; Gfl, Gini coefficient of FL; Gfd, Gini coefficient of FD; Gfa, Gini coefficient of FA; CVfl, coefficient of variation of FL; CVfd, coefficient of variation of FD; CVfa, coefficient of variation of FA.