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Manipulating tree crown structure to promote old-growth characteristics in second-growth redwood forest canopies / Stephen C. Sillett in Forest ecology and management, vol 417 (15 May 2018)  

Public [article]  inForest ecology and management > vol 417 (15 May 2018) . - pp 77 - 89 Titre : Manipulating tree crown structure to promote old-growth characteristics in second-growth redwood forest canopies Type de document : Article/Communication Auteurs : Stephen C. Sillett, Auteur ; Marie E. Antoine, Auteur ; Jim Campbell-Spickler, Auteur ; Allyson L. Carroll, Auteur ; Ethan J. Coonen, Auteur ; et al., Auteur Année de publication : 2018 Article en page(s) : pp 77 - 89 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] Californie (Etats-Unis) [Termes IGN] canopée [Termes IGN] croissance des arbres [Termes IGN] élagage (sylviculture) [Termes IGN] houppier [Termes IGN] Sequoia sempervirens Résumé : (Auteur) In old-growth Sequoia sempervirens forests, reiterated trunks and limbs provide required habitat elements for specialized arboreal species, including an endangered seabird, Brachyramphus marmoratus. The oldest second-growth redwood forests—established after 19th century logging—lack species dependent on complex structure, presumably because redwoods maintain simple, model-conforming crowns for centuries unless damaged by wind or fire. We imposed a factorial experiment on 24 redwoods 59–75 m tall in six second-growth forests to determine if trunk reiteration and limb formation can be induced by removing treetops (topping) and branch tips (tipping) to disrupt apical control. We also increased light availability in the upper crown by pruning branches. After intensively mapping trunks and branches and imposing treatments, we re-mapped trees three years later to quantify growth increments. Topping stimulated trunk reiteration from the cut, and reiterated tops gained height more rapidly than controls. Tipping also stimulated trunk reiteration from branches, especially when combined with topping, resulting in formation of limbs (i.e., branches giving rise to reiterated trunks). Pruning had consistently negative effects on trunk and branch growth increments even after accounting for post-treatment variation in leaf area and light availability, suggesting that photosynthate was diverted to compartmentalization of wounds. Strategic injury of trees may have long-term conservation value in second-growth redwood forests if limbs can be initiated high enough in the crown to persist as trees approach maximum height. Topping and tipping treatments should be combined with silvicultural thinning of neighboring trees to increase light availability far more than can be achieved by pruning. Numéro de notice : A2018-469 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.foreco.2018.02.036 Date de publication en ligne : 08/03/2018 En ligne : https://doi.org/10.1016/j.foreco.2018.02.036 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91150 [article]

Influence of microstructured carbon materials on Sequoia sempervirens (D. Don.) Endl. in vitro culture / Raluca Stoiculescu in Annals of forest research, vol 52 n° 1 (January 2009)    

Public [article]  inAnnals of forest research > vol 52 n° 1 (January 2009) . - p. 137-141 Titre : Influence of microstructured carbon materials on Sequoia sempervirens (D. Don.) Endl. in vitro culture Type de document : Article/Communication Auteurs : Raluca Stoiculescu, Auteur ; Gina Cogalniceanu, Auteur ; Aurelia Brezeanu, Auteur ; Gabriela Hristea, Auteur Année de publication : 2009 Article en page(s) : p. 137-141 Note générale : Bibliogr. Langues : Anglais (eng) Descripteur : [Termes IGN] carbone [Termes IGN] microbouturage [Termes IGN] Sequoia sempervirens Résumé : (Auteur) "The present experimental research has been mainly focused on Sequoia sempervirens (D. Don.) Endl. as woody plant model system, for testing the influence of some microstructured carbon materials (CCM) comparing with the activated charcoal action, on the in vitro growth. The work hypothesis was that CCM can induce effects on the plant culture, similar to those induced by activated charcoal, due to their high absorption capacity. The influence of two types CCM and activated charcoal introduced in the medium culture was evaluated on the fresh weight and on the length of the in vitro regenerants, after 30 and 60 days of cultivation. Our data revealed that the CCM is not toxic and does not inhibit plant growth. We also remarked that S. sempervirens (D. Don.) Endl. was more reactive to the activated charcoal into the nutritive medium than the CCM compounds. The use of these new microstructured compounds is an important step both in the study of materials science and in the field of plant biotechnologies." Numéro de notice : IFN_5802 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : sans En ligne : http://www.editurasilvica.ro/afr/52/1/13_Stoiculescu.pdf Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=73514 [article]

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