pointRes 2.0: New functions to describe tree resilience

After being proposed by Lloret et al. in 2011, the resilience components resistance, recovery, resilience and relative resilience became highly popular for studying tree growth responses to disturbances and extreme weather events. As the 'Lloret indices', however, have conceptual limitations, various additional indices to characterize tree resilience have been discussed since then, namely: recovery period, total growth reduction, average recovery rate, and average growth reduction. In pointRes 2.0, a major update of the R-package pointRes, these new indices have now been implemented. Besides convenient functions for calculating and plotting resilience indices, two new functions for calculating pointer years using (i) the interval trend method, and (ii) a 'z-transformation of site chronology'-approach have been included as well. This technical note illustrates pointRes' new functionalities.

Automated summary

The paper introduces commonly used resilience indices for studying tree growth responses, and discusses new indices and functions implemented in the latest version of the R-package pointRes. These new features aid researchers in better assessing tree resilience and growth patterns.