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How much does it take to be old? Modelling the time since the last harvesting to infer the distribution of overmature forests in France / Lucie Thompson in Diversity and Distributions, 28 (2022) 

Public Citation [article]  inDiversity and Distributions > 28 (2022) . - 200-213 Titre : How much does it take to be old? Modelling the time since the last harvesting to infer the distribution of overmature forests in France Type de document : Imprimé Auteurs : Lucie Thompson ; Eugénie Cateau ; Nicolas Debaive ; Frédéric Bray ; André Torre ; Patrick Vallet ; Yohann Paillet Année de publication : 2022 Article en page(s) : 200-213 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Forêts (habitat) Résumé : Aim: The distribution of overmature forests in metropolitan France is poorly known, with only a few well-studied prominent sites, and has never been evaluated countrywide. Here, we modelled French forest reserves' time since the last harvesting operation—a proxy for forest maturity—then inferred the current statistical distribution of overmature forests (i.e., forests over 50 years without harvesting) in France. Location: Metropolitan France. Methods: We used inventories from forest reserves and managed forests to calibrate a generalised linear mixed model explaining the time since the last harvesting with selected structural attributes and environmental variables. We then projected this model on the independent National Forest Inventory dataset. We thus obtained an updated estimation of the proportion and a rough distribution of overmature forest stands in metropolitan France. Results: We found that high basal area of very large trees, high volumes of standing and downed deadwood, high diversity of tree-related microhabitats and more marginally diversity of decay stages best characterised the time since the last harvesting. Volumes of stumps and high density of coppices translating legacy of past forest management also distinguished more overmature plots. Our projection yielded an estimated 3% of French forests over 50 years without harvesting mostly located in more inaccessible areas (i.e., mountainous areas). Main conclusions: Our study showed that the time since the last harvesting could be derived from a combination of key structural attributes characterising overmature temperate forests. It gives the first robust statistical estimate of the proportion of overmature forests in France and may serve to report on their status. Our method could be extended in countries with accessible National Forest Inventory and calibration data, thus producing indicators at an international level. Lien pérenne : DOI : 10.1111/ddi.13436 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=151589 Thompson, Lucie, Cateau, Eugénie, Debaive, Nicolas, Bray, Frédéric, Torre, André, Vallet, Patrick, Paillet, Yohann 2022 How much does it take to be old? Modelling the time since the last harvesting to infer the distribution of overmature forests in France. Diversity and Distributions, 28: 200-213.

Documents numériques

Consultable Article (2022) URL

Understanding patterns and pathways of exotic perennial grass invasion in South-eastern Australian grassy communities / Julia Rayment in Diversity and Distributions, 28 (2022) 

Public Citation [article]  inDiversity and Distributions > 28 (2022) . - 1136-1150 Titre : Understanding patterns and pathways of exotic perennial grass invasion in South-eastern Australian grassy communities Type de document : Imprimé Auteurs : Julia Rayment ; Kris French Année de publication : 2022 Article en page(s) : 1136-1150 Langues : Anglais (eng) Résumé : Location New South Wales, Australia. Method Field surveys of EPGs at 139 sites from nine grassy communities across four regions were assessed for variation in invasion profiles amongst regions and communities. We used a ranking of invasion risk based on plant characteristics to identify grasses likely to be more invasive and tested whether this ranking predicted the level of invasion in the survey. Results Using multivariate analysis, we found that all communities were significantly invaded. These assemblages were distinct regionally, and for most plant communities. Five widespread invaders were established in all regions and communities. Invasion by pasture grasses (termed trade-off species) was the most significant threat, coupled with capacity to develop long-term seed banks and use allelopathy. Species with higher risk rankings were recorded in more sites, although a few grasses had much greater occurrences than their ranking predicted. Conclusions Grassy communities across all regions were invaded by a suite of EPGs, some that have not been considered as problematic previously. Higher levels of invasion were associated with higher ranked species based on plant traits, indicating that our risk assessment is valuable as a management prioritization tool. Findings support community level management, although some species are important widespread invaders and could be managed at larger scales. Differences in species assemblages compared to nearby agricultural areas confirm different invasion pathways, with significant invasion from pasture grasses. Aided by the risk assessment tool, we propose that EPG management in native communities considers the climatic, community (including surrounding) and species level for prioritization. Lien pérenne : DOI : 10.1111/ddi.13520 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=154488 Rayment, Julia, French, Kris 2022 Understanding patterns and pathways of exotic perennial grass invasion in South-eastern Australian grassy communities. Diversity and Distributions, 28: 1136-1150.

Documents numériques

Consultable article (2022) URL