Authors’
contributions
C.J. Chu, Y.H. Zhang and W. Lin
conceived and designed the study. Y.H. Zhang and W. Lin performed the
experiments and data analysis. B.H. Li conducted the forest census. Y.H.
Zhang and W. Lin contributed materials collection. W. Lin wrote the
paper. C.J. Chu, S.A. Queenborough, M. Ni, Q. He, and Y.H. Zhang revised
the paper.