Projecting Forest Dynamics Across Europe Potentials and Pitfalls of Empirical Mortality Algorithms

• Published in: Ecosystems (New York) Vol. 23; no. 1; pp. 188 - 203
• Main Authors: Thrippleton, Timothy, Hülsmann, Lisa, Cailleret, Maxime, Bugmann, Harald
• Format: Journal Article
• Language: English
• Published: New York Springer Science + Business Media 01-01-2020; Springer US; Springer; Springer Nature B.V; Springer Verlag
• Subjects: Algorithms; Analysis; Biodiversity and Ecology; Biomedical and Life Sciences; Climate change; Climatic changes; Dynamics; Ecological effects; Ecology; Ecosystem dynamics; Ecosystems; Environmental conditions; Environmental Management; Environmental Sciences; Forest ecology; Forest ecosystems; Forests; Geoecology/Natural Processes; Health aspects; Hydrology/Water Resources; Life Sciences; Mathematical models; Model accuracy; Mortality; Mortality patterns; Old growth forests; Original Articles; Pine trees; Plant Sciences; Plant species; Terrestrial ecosystems; Zoology; Europe; tree mortality; dynamic vegetation model; forest dynamics; mortality models; environmental gradient; climate change; Dynamic vegetation model; Pinus sylvestris
• ISSN: 1432-9840; 1435-0629
• DOI: 10.1007/s10021-019-00397-3

Mortality is a key process of forest ecosystem dynamics and functioning strongly altering biomass stocks and carbon residence times. Dynamic vegetation models (DVMs) used to predict forest dynamics are typically based on simple, largely data-free (‘theoretical’) mortality algorithms (MAs). To improve DVM projections, the use of empirically based MAs has been suggested, but little is known about their impact on DVM behavior. A systematic comparison of eight MAs (seven inventory-based, one ‘theoretical’) for the pan-European tree species Pinus sylvestris L. was carried out within the DVM ForClim for present and future climate scenarios at three contrasting sites across Europe. Model accuracy was furthermore evaluated with empirical data from young-and oldgrowth forests. We found strongly diverging mortality patterns among the MAs for present climate. Based on their behavior, we identified two distinct empirical MA groups that were related to their structure (i.e., variables considered), but not to their geographic origin (i.e., the environmental conditions they were calibrated to). Under climate change, MAs based on a competition index produced ecologically inconsistent results, while MAs based on growth showed more plausible and less extreme behaviors. Furthermore, MAs based on growth reached a higher accuracy for projecting young- and old-growth forest dynamics. Our results demonstrate that using empirical MAs in DVMs has a high potential to better predict forest dynamics, but also a risk of yielding implausible results if their structure is inadequate. For DVM applications across large spatiotemporal scales, we thus suggest using MAs based on growth, particularly under future no-analogue climates.