Quantifying the resilience of forest ecosystems in response to droughts is fundamentally important to assess their capacity to function under intensifying climate change with more extreme droughts. The concept proposed by Lloret et al. (2011) to quantify resilience components of tree growth through indices of resistance, recovery, and resilience has become highly popular in dendro-ecological analyses because it allows a simple, yet highly efficient assessment of short-term responses of trees to drought. Until today these Lloret-indices have been used in 82 studies on growth response to drought of 66 trees species in different climatic regions. Despite their widespread use, some important drawbacks and limitations related to the application of these indices may lead to spurious results or misinterpretation of observed patterns. One major reason for this problem is the inconsistency regarding the selection and characterization of drought events as well as the calculation of the indices. Therefore, this review aims at identifying and discussing shortcomings and pitfalls of Lloret’s indices and to develop recommendations for a more robust and standardized procedure. In addition, we propose a new analytical framework that integrates the different Lloret-indices by comparing observed relationships between resistance and recovery of tree species or treatments to a hypothetical ‘line of full resilience’, which describes the relationship between resistance and recovery that leads to full resilience of radial growth at any given value of resistance. The fit of observed relationships between resistance and recovery with the hypothetical ‘line of full resilience’ can be used for comparative drought-tolerance assessments such as rankings of different tree species or treatments. The suggested approach could be used to harmonize quantifications of tree growth resilience to drought and it may thus facilitate systematic reviews and development of the urgently needed evidence base to identify suitable tree species and management options under climatic change.

A small library of dinuclear gold(I) complexes with the title ligands has been prepared, encompassing, neutral, mono- and dicationic complexes. The luminescence properties of the complexes in the solid state...

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