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Predicting carbon accumulation in temperate forests of Ontario, Canada using a LiDAR-initialized growth-and-yield model / Paulina T. Marczak in Remote sensing, vol 12 n°1 (January 2020)  

Public [article]  inRemote sensing > vol 12 n°1 (January 2020) . - 29 p. Titre : Predicting carbon accumulation in temperate forests of Ontario, Canada using a LiDAR-initialized growth-and-yield model Type de document : Article/Communication Auteurs : Paulina T. Marczak, Auteur ; Karin Y. Van Ewijk, Auteur ; Paul M. Treitz, Auteur ; et al., Auteur Année de publication : 2020 Article en page(s) : 29 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes descripteurs IGN] carbone [Termes descripteurs IGN] changement climatique [Termes descripteurs IGN] diamètre à hauteur de poitrine [Termes descripteurs IGN] diamètre des arbres [Termes descripteurs IGN] données lidar [Termes descripteurs IGN] forêt tempérée [Termes descripteurs IGN] modèle de croissance [Termes descripteurs IGN] Ontario [Termes descripteurs IGN] peuplement forestier [Termes descripteurs IGN] photo-interprétation [Termes descripteurs IGN] puits de carbone [Termes descripteurs IGN] rendement [Termes descripteurs IGN] semis de points Résumé : (auteur) Climate warming has led to an urgent need for improved estimates of carbon accumulation in uneven-aged, mixed temperate forests, where high uncertainty remains. We investigated the feasibility of using LiDAR-derived forest attributes to initialize a growth and yield (G&Y) model in complex stands at the Petawawa Research Forest (PRF) in eastern Ontario, Canada; i.e., can G&Y models based on LiDAR provide accurate predictions of aboveground carbon accumulation in complex forests compared to traditional inventory-based estimates? Applying a local G&Y model, we forecasted aboveground carbon stock (tons/ha) and accumulation (tons/ha/yr) using recurring plot measurements from 2012–2016, FVS1. We applied statistical predictors derived from LiDAR to predict stem density (SD), stem diameter distribution (SDD), and basal area distribution (BA_dist). These data, along with measured species abundance, were used to initialize a second model (FVS2). A third model was tested using LiDAR-initialized tree lists and photo-interpreted estimates of species abundance (i.e., FVS3). The carbon stock projections for 2016 from the inventory-based G&Y model) were equivalent to validation carbon stocks measured in 2016 at all size-class levels (p 0.05). At the plot level, LiDAR-based predictions of carbon accumulation over a nine-year period did not differ when using either inventory or photo-interpreted species (p Numéro de notice : A2020-222 Thématique : IMAGERIE Nature : Article DOI : 10.3390/rs12010201 date de publication en ligne : 06/01/2020 En ligne : https://doi.org/10.3390/rs12010201 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=94934 [article]

Economics of harvesting uneven-aged forest stands in Fennoscandia / Janne Rämo in Scandinavian journal of forest research, vol 29 n° 8 (October 2014)  

Public [article]  inScandinavian journal of forest research > vol 29 n° 8 (October 2014) . - pp 777 - 792 Titre : Economics of harvesting uneven-aged forest stands in Fennoscandia Type de document : Article/Communication Auteurs : Janne Rämo, Auteur ; Olli Tahvonen, Auteur Année de publication : 2014 Article en page(s) : pp 777 - 792 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Economie [Termes descripteurs IGN] Betula (genre) [Termes descripteurs IGN] Fennoscandie [Termes descripteurs IGN] forêt inéquienne [Termes descripteurs IGN] peuplement forestier [Termes descripteurs IGN] Picea abies [Termes descripteurs IGN] Pinus sylvestris [Termes descripteurs IGN] rendement Résumé : (auteur) This study analyzes the optimal harvesting of uneven-aged Norway spruce (Picea abies (L.) Karst.), Scots pine (Pinus sylvestris L.), and birch (Betula pendula Roth. and B. pubescens Ehrh.) stands. The analysis is based on an economic description of uneven-aged forestry using a size-structured transition matrix model and a single-tree model. The optimization problem is solved in its general dynamic form using gradient-based interior point methods. Increasing the harvesting interval decreases the annual volume yield. Assuming natural regeneration, this suggests that volume yield is maximized by uneven-aged rather than even-aged management. The present value of stumpage revenues is maximized after saw timber and pulpwood prices, interest rate, and a 15-year harvesting interval are included. The economically optimal solution with a 3% interest rate produces an annual yield of 1.9, 6.2, and 3.1 cubic meters for Scots pine, Norway spruce, and birch, respectively. Both the optimal volume yield and net present value maximization solutions converge to unique species- and site-type-specific steady states with constant harvests. The transition matrix model typically used in optimization studies is computationally less demanding than the single-tree model, but the differences in optimal solutions are more remarkable than earlier studies suggest. Numéro de notice : A2014-783 Thématique : FORET Nature : Article En ligne : http://dx.doi.org/10.1080/02827581.2014.982166 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79380 [article]

A comprehensive framework of forest stand property-density relationships: perspectives for plant population ecology and forest management / James N. Long in Annals of Forest Science, vol 71 n° 3 (April - May 2014)  

Public [article]  inAnnals of Forest Science > vol 71 n° 3 (April - May 2014) . - pp 325 - 335 Titre : A comprehensive framework of forest stand property-density relationships: perspectives for plant population ecology and forest management Type de document : Article/Communication Auteurs : James N. Long, Auteur ; Giorgio Vacchiano, Auteur Année de publication : 2014 Article en page(s) : pp 325 - 335 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes descripteurs IGN] densité de la végétation [Termes descripteurs IGN] écologie [Termes descripteurs IGN] gestion des ressources [Termes descripteurs IGN] propriété foncière [Termes descripteurs IGN] rendement [Termes descripteurs IGN] station forestière [Termes descripteurs IGN] sylviculture Résumé : (Auteur) - Context There are many stand property-density relationships in ecology which represent emergent properties of plant populations. Examples include self-thinning, competition-density effect, constant final yield, and age-related decline in stand growth. We suggest that these relationships are different aspects of a general framework of stand property-density relationships. $- Aims We aim to illustrate the generalities and ecological implications of stand property-density relationships, and organize them in a comprehensive framework. $- Methods We illustrate relationships between stand property and density (1) at one point in time, (2) over time, and (3) independent of time. We review the consequences of considering different variables to characterize stand property (mean tree size, mean tree growth, stand growth, stand yield, stand leaf area). $- Results We provide a framework that integrates the broad categories of stand property-density relationships and individual expressions of these relationships. For example, we conclude that constant final yield is a special case of the growth-growing stock relationship for life forms were yield is a reasonable approximation of growth (non-woody plants). $- Conclusion There is support in the literature for leaf area being broadly integrative with respect to various expressions of stand property-density relationships. We show how this is and suggest implications for plant population ecology and forest management. Numéro de notice : A2014-231 Thématique : FORET Nature : Article DOI : 10.1007/s13595-013-0351-3 date de publication en ligne : 01/05/2014 En ligne : https://doi.org/10.1007/s13595-013-0351-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33134 [article]

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