Báo cáo lâm nghiệp: "Growth response to thinning in Quercus pyrenaica Willd coppice stands in Spanish central mountain" doc

... Growth response of Q. pyrenaica to thinning 245 The results of Ducan’s test also explain the aforementioned different responses to thinning intensities in the two growth intervals (Tab. ... deviation (in bracket) absolute and relative stem diameter increment of Q. pyrenaica trees in unthinned and thinned treatments (C – light thinning; D – moderate thinning; E – heavy th...

Ngày tải lên: 08/08/2014, 01:22

... partitioning Variations in biomass partitioning were mainly associated to tree height (Tab. II). In the 2YS, plants decreased their allo- cation to roots and rapidly increase branching when increasing size ... average values in the study site for the 1971−2000 period. Snow is represented in black and rainfall in grey colour. thus totalling 288 trees per plantation year. In the...

Ngày tải lên: 07/08/2014, 16:20

... mixed stands is included into an exchangeable zone (aluminium zone of buffering). In the beech stand, it is possible to classify soil according to pH values to a bor- derline of the buffer zone ... decrease with increasing depth (Figs. 2 and 3) in all stands and the lowest values were determined in the H layer. e lowest values in forest floor in the H horizon (3.5 and...

Ngày tải lên: 07/08/2014, 03:22

... compared to other oak species [41]. General interest comes mainly from the need to preserve genetic resources and to use them in rehabilitation programs. Nevertheless, few information regarding the ... pre-planting started in 1997. Cork oak seedlings were grown for 4 months in monospecific conditions without fertilizer in order to eliminate any source of variation. Then, they w...

Ngày tải lên: 07/08/2014, 16:21

... thinning 2 nd thinning 1 st thinning 3 rd thinning 0 10 20 30 40 50 60 70 80 90 100 020406080100120 Stand age (years) Basal area (m 2 ha -1 ) AFTER; SI = 6 m 4 th thinning 3 rd thinning 1 st thinning 2 nd ... m 4 th thinning 3 rd thinning 2 nd thinning 1 st thinning 0 10 20 30 40 50 60 70 80 90 100 020406080100120 Stand age (years) Basal area (m 2 ha -1 ) BEF...

Ngày tải lên: 07/08/2014, 16:21

... resulted an efficient tool to describe accurately the NR process within Pinus nigra stands in order to infer on the nature of the causal factors. Within Pinus nigra stands with similar age but ... tempo- rary canopy opening, moderate thinning) [18]. Finally, although predicting the evolution of the examined stands in relation to the present colonisation strategies is diffi- c...

Ngày tải lên: 08/08/2014, 00:22

... characterised each thinning (years since previous thinning and remaining basal area after thinning) the latter one appeared to have more influence on SEV. The optimisations of thinnings and rotation ... thinnings and regenerative cuttings The simulation sub-system allows for the simulation of thinnings and regenerative cuttings. Thinning treatments are restricted to thinnings from...

Ngày tải lên: 08/08/2014, 01:21

... on rings corresponding to cer- tain years, which might in any case indicate, in addition to the factors already mentioned, a certain importance of factors linked to the climatic ... four sectors hav- ing stools with shoots of 35 years old (37 stools, corresponding to 40% of the total), 33 years old (28 stools, corresponding to 29% of t...

Ngày tải lên: 08/08/2014, 18:21

... 163–171 © INRA, EDP Sciences, 2003 DOI: 10.1051/forest:2003009 Original article Growth and biomass partitioning of Fagus sylvatica L. and Quercus robur L. seedlings in response to shading and ... radiant energy quality in woodlands, Photochem. Photobiol. 26 (1977) 487–491. [49] Tognetti R., Minotta G., Pinzauti S., Michelozzi M., Borghetti M., Acclimation to changing light condit...

Ngày tải lên: 08/08/2014, 01:21

... (axis 1) explained 26.1%, axis 2 explained 68.5% and axis 3 explained 65.8% of total variability in the species data. 9.4% of total variability in the species data was explained by axis 1, ... Protected Organisms in Coppices and Coppice- with-Standards under the Natura 2000 System. e response of weevil communities (Coleoptera: Curculionoidea) to the altitudinal zones of beech...

Ngày tải lên: 07/08/2014, 03:22