Centre de documentation
scientifique

Comparing close-to-nature silviculture with processes in pristine forests: lessons from Central Europe / Jean-Philippe Schütz in Annals of Forest Science, vol 73 n° 4 (December 2016)  

Public [article]  inAnnals of Forest Science > vol 73 n° 4 (December 2016) . - pp 911 - 921 Titre : Comparing close-to-nature silviculture with processes in pristine forests: lessons from Central Europe Type de document : Article/Communication Auteurs : Jean-Philippe Schütz, Auteur ; Milan Saniga, Auteur ; Jurij Diaci, Auteur ; Tomas Vrska, Auteur Année de publication : 2016 Article en page(s) : pp 911 - 921 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] dynamique de la végétation [Termes IGN] Europe centrale [Termes IGN] sylviculture Résumé : (auteur) [introduction] The term close-to-nature silviculture already contains some ambiguity since (silvi) culture implies the act of forest use. This notion was coined a long time ago by well-known silviculturists (Gayer 1885; Engler 1905; Leibundgut 1943 and more) to characterise a new form of forest management that differs from plantation forestry and the clear-cut system. The aim was a paradigmatic alternative to create multi-storeyed and rich mixed forest stands, with forest management emulating natural processes and seamless replacement of generations. Which of these processes should be selected and the degree to which natural forest dynamics should be imitated have not yet been specifically defined because the term was conceived in a general and conceptual sense and, furthermore, the aim has never been to let nature work alone. We can here quote Leibundgut (1943, p. 152) [transl. from German] “The main task of silviculture is to maximise and maintain the value produced by the forest”. Such a formulation is still quite relevant today, when the term “value” is understood in a broader sense. Actually, it would be more appropriate to use the term “utility” (original term “utilité”) in the sense of Biolley (1901). Numéro de notice : A2016--167 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1007/s13595-016-057 Date de publication en ligne : 12/09/2016 En ligne : https://doi.org/10.1007/s13595-016-0579-9 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=87204 [article]

Optimising the yield of Douglas-fir with an appropriate thinning regime / Jean-Philippe Schütz in European Journal of Forest Research, vol 134 n° 3 (May 2015)  

Public [article]  inEuropean Journal of Forest Research > vol 134 n° 3 (May 2015) . - pp 469 - 480 Titre : Optimising the yield of Douglas-fir with an appropriate thinning regime Type de document : Article/Communication Auteurs : Jean-Philippe Schütz, Auteur ; Peter Lukas Ammann, Auteur ; Andreas Zingg, Auteur Année de publication : 2015 Article en page(s) : pp 469 - 480 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] éclaircie (sylviculture) [Termes IGN] peuplement forestier [Termes IGN] Pseudotsuga menziesii [Termes IGN] simulation [Termes IGN] Suisse Résumé : (auteur) Aim of this study was to determine the long-term effects of thinning regime with different intensities on the stand and tree social classes development, particularly regarding the old question of compensative effect between stocking and girth improvement using the example of Douglas-fir. Data provide from a thinning experiment in one site of Swiss Central Plateau, from age 11 until 41 years containing six treatment variants (three planting densities and two level of stand density) repeatedly measured six times, as well as from seven permanent yield plots times series aged between 17 and 127 years. We present as well the real observed characteristics in term of stem numbers distribution, diameter increment per d.b.h. categories, as results from simulation over the whole production time until 105 years with an appropriate growth simulator, in terms of net value increment (MAIv). Our results show that the effect of thinning works mainly on the social medium categories, in terms of number and girth improvement. Social dominant trees are more or less untouched by thinning, demonstrating that there are in every stand a quite important number of self-dominating trees which do not need particular silvicultural help to maintain their dominant status in the upper storey. The expected compensation between stem number reduction and girth improvement shows that the remaining stand density is determinant on the net value level. The so-called mass effect seems really more effective. The best way to improve a stand value appears to be artificial pruning. Because a thinning regime should not consider only the economic productivity but take in account risk, stability and resilience and particularly the way of renewal, we suggest a way for optimising the thinning regime combining effect of biological rationalisation and risks. Numéro de notice : A2015-183 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1007/s10342-015-0865-3 Date de publication en ligne : 28/01/2015 En ligne : https://doi.org/10.1007/s10342-015-0865-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75935 [article]