About the Authors

Xiaochun Wang

wangxc-cf@nefu.edu.cn

Affiliation College of Forestry, Northeast Forestry University, Harbin, Heilongjiang, China

Peter M. Brown

Affiliation Rocky Mountain Tree-Ring Research, Fort Collins, Colorado, United States of America

Yanni Zhang

Affiliation College of Landscape Architecture, Northeast Forestry University, Harbin, Heilongjiang, China

Laiping Song

Affiliation College of Forestry, Northeast Forestry University, Harbin, Heilongjiang, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: XW. Performed the experiments: YZ LS. Analyzed the data: YZ LS. Contributed reagents/materials/analysis tools: XC. Wrote the paper: XC PB. Interpreted data and revised important content: PB.