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. 2020 Aug 12;11:1244. doi: 10.3389/fpls.2020.01244

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Copyright © 2020 Zhang, Li, Wang, Xu, Li, Liu, Wu, Zhang, Yu and He

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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Linear regressions of chlorophyll concentrations (chla, chlb, and chla+b) and ratio (chla/b) to major environmental factors grouped by regions. (A–D), (E–H), (I–L), and (M–P) denote regressions of chla, chlb, chla+b, and chla/b to four environmental factors, respectively. MP, Mongolia Plateau; LP, Loess Plateau; TP, Tibet Plateau; PAR, photosynthetic active radiation; MAP, mean annual precipitation; N:P, the ratio of soil nitrogen to soil phosphorus; MAT, mean annual temperature. Lines denote significant linear fitted relationships (p < 0.05).