ACKNOWLEDGMENTS
The authors would like to thank Minshan Xu, Liting Zheng, Xiangyu Liu, Umar Aftab Abbasi, Tian Su, Wujian Xiong, Qiming Liang, Xiaotong Zhu, Liang Li, Dong He and Liangyan Wang for their assistance preparing the wood samples in the field and laboratory. This study was supported by the National Natural Science Foundation of China (Grant Nos. 31770467 and 31670438). The authors declare no competing interests.