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. 2021 Jun 16;12:608211. doi: 10.3389/fpls.2021.608211

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Copyright © 2021 Shan, Ling, Zhao, Li, Wang and Zhang.

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 trend charts of annual extreme temperature indices during 1961–2017. (A) linear trend chart of warm nights, (B) linear trend chart of monthly maximum value of min temperature, (C) linear trend chart of hot nights, (D) linear trend chart of warm spell duration indicator, (E) linear trend chart of frost days, (F) linear trend chart of icing days, (G) linear trend chart of cold days, and (H) linear trend chart of Cold spell duration indicator.