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Terrestrial laser scanning as a tool for assessing tree growth / Jonathan Sheppard in iForest, biogeosciences and forestry, vol 10 n° 1 (February 2017)  

Public [article]  iniForest, biogeosciences and forestry > vol 10 n° 1 (February 2017) . - pp 172 - 179 Titre : Terrestrial laser scanning as a tool for assessing tree growth Type de document : Article/Communication Auteurs : Jonathan Sheppard, Auteur ; Christopher D. Morhart, Auteur ; Jan Hackenberg , Auteur ; Heinrich Spiecker, Auteur Année de publication : 2017 Projets : StarTree / Article en page(s) : pp 172 - 179 Note générale : bibliographie This research was supported by the EU FP7 project “Star-Tree” (Grant no. 311919), by the Federal Ministry of Education and Research of germany (BMBF) within the Sino-German Lin2-Value project (no. 033L049A), and the German Federal Ministry of Food and Agriculture (BMEL) within the project “Agro-Wertholz” (support code 22031112). Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] Allemagne [Termes IGN] allométrie [Termes IGN] biomasse aérienne [Termes IGN] croissance des arbres [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] modèle mathématique [Termes IGN] Prunus avium [Termes IGN] série temporelle Résumé : (auteur) Terrestrial laser scanning (TLS) technology is a powerful tool for assessing tree growth based on time series analysis, as it allows a level of scrutiny not achievable using established destructive techniques. We applied TLS technology to 21 wild cherry trees grown in a research plot near Breisach (southern Germany) in order to build quantitative structure models (QSMs) for each tree. Scans were carried out over three subsequent years (2012-2014), so that three QSMs per each tree were constructed. Using the above approach, we were able to assess the annual growth of the individual wild cherry trees in terms of diameter and height, stem and branch volume, and the merchantable timber fraction. In addition, the growth of single branches of sample trees was detected and quantified. The availability of QSMs based on TLS-derived data allowed the accurate determination of crown length and width, as well as the volume reduction as the result of the tree pruning applied after the first scan (2012). The aboveground biomass (AGB) was assessed for each tree based on the QSM-derived volume and published wood density values for wild cherry, and then compared with AGB values estimated with standard allometric methods, obtaining a very high correlation (r2adj= 0.941). We concluded that the proposed approach is an effective non-destructive technique to accurately assess the increase of tree biomass, and discuss its future application in the forestry sector. Numéro de notice : A2017-890 Affiliation des auteurs : LIF+Ext (2012-2019) Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3832/ifor2138-009 Date de publication en ligne : 19/11/2016 En ligne : https://doi.org/10.3832/ifor2138-009 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91879 [article]

Alley coppice—a new system with ancient roots / Christopher D. Morhart in Annals of Forest Science, vol 71 n° 5 (July - August 2014)  

Public [article]  inAnnals of Forest Science > vol 71 n° 5 (July - August 2014) . - pp 527 - 542 Titre : Alley coppice—a new system with ancient roots Type de document : Article/Communication Auteurs : Christopher D. Morhart, Auteur ; Gerry C. Douglas, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 527 - 542 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] biodiversité [Termes IGN] bois [Termes IGN] production agricole végétale [Termes IGN] sylviculture Résumé : (Auteur) Context : Current production from natural forests will not satisfy future world demand for timber and fuel wood, and new land management options are required. Aims : We explore an innovative production system that combines the production of short rotation coppice in wide alleys with the production of high-value trees on narrow strips of land; it is an alternative form of alley cropping which we propose to call ‘alley coppice’. The aim is to describe this alley coppice system and to illustrate its potential for producing two diverse products, namely high-value timber and energy wood on the same land unit. Methods : Based on a comprehensive literature review, we compare the advantages and disadvantages of the alley coppice system and contrast the features with well-known existing or past systems of biomass and wood production. Results : We describe and discuss the basic aspects of alley coppice, its design and dynamics, the processes of competition and facilitation, issues of ecology, and areas that are open for future research. Conclusion : Based on existing knowledge, a solid foundation for the implementation of alley coppice on suitable land is presented, and the high potential of this system could be shown. Numéro de notice : A2014-424 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article DOI : 10.1007/s13595-014-0373-5 Date de publication en ligne : 06/05/2014 En ligne : https://doi.org/10.1007/s13595-014-0373-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=73962 [article]

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