Báo cáo lâm nghiệp:"Predicting the probability of seed germination in Pinus sylvestris L and four competitor shrub species after fire" doc

... high temperatures favoured the germination of Genista florida. Therefore, a balance between the elimination of competitor shrub species and the stimulation of the germination of Pinus sylvestris seeds must be ... 2 log likelihood including only the constant of the complete model. The models in bold are the selected ones. The coefficients of the...

Ngày tải lên: 08/08/2014, 01:21

... consistent model for predicting the number and the vertical location on the bole of all the primary branches, including the interwhorl branches. Branch survival and subsequent size mainly depend on both their ... was the initial state downwards in order to model the length of the top zone. The core of the proposed data analysis methodology consists in iterati...

Ngày tải lên: 07/08/2014, 16:21

... cambial perimeter. The number of fusiform cells in the radial cell files is related to the number of periclinal divisions in both the fusiform initials and their meristematic derivatives. Their cellular ... case of the terminal latewood cells, where development proceeds below the values given. b F – fusiform cells. Terminal latewood cells derive from this type of c...

Ngày tải lên: 08/08/2014, 00:22

... million trees with a royalty value of A$10–12 millions were killed in a single area in southern Australia [16]. It is now established in the majority of Pinus plantations (mainly P. radiata) in ... proximity of infested stands within Chile and in neighbouring Argentina, and the high susceptibility of P. radiata, the chances that S. noctilio will establish in t...

Ngày tải lên: 08/08/2014, 00:22

... started in the stud- ied localities at the end of May or at the beginning of June depending on the actual weather. C. alpina flew first, followed by C. erythrogaster and C. arven- sis, the last flying ... in Fig. 1 and Table 3. e first canonical axis explains 38.8% of variability, both canonical axes explain 53% of variability (Table 2). All axes explain 100% of var...

Ngày tải lên: 07/08/2014, 03:22

... independently of the original dis- tribution of the variable of interest. Here, although the estimate of the true mean is unbiased and the variance of the mean decreases (Tables 3 and 4) with increasing ... random sampling (Fig. 6b), gains in precision are only slightly larger. Probably, the little size and spatial distribution of connected areas of th...

Ngày tải lên: 07/08/2014, 03:22

... renewal the site prepa- Table 2. e dominance of species of the family Lumbricidae caught by the method of tullgrens and individual col- lection (2009) Species Method of tullgrens Individual collection ... lit- terfall and effects on light or shade. Consequently, dense larch stands were the cause of decreased de- velopment of the herb layer. It is interesting t...

Ngày tải lên: 07/08/2014, 10:21

... MATERIALS AND METHODS The stand level offers the first meaningful level of decision mak- ing, and the results obtained for the stand level management can be used as guidelines in forest level planning ... thinning intensity depends on the number of the thinning, the intensity increasing from the first thinning to the fourth. The intensity of the first thinning is...

Ngày tải lên: 07/08/2014, 16:21

... given combination of DVs was fed into the simulator, which simulated cuttings and the development of the stand, and from these results the value of the objective function was calculated. The objective ... considerations in the optimisation problem, the effect of retaining a minimum number of very large tress in the stand was analysed. The lower profitabil...

Ngày tải lên: 08/08/2014, 00:21

... stand age when the first thinning occurs; years since previous thinning for the other thinnings; remaining basal area. For the final cutting: years since the last thinning to the first regen- erative ... destroyed in Portugal, Spain and southern Italy [28]. The problem is becoming increasingly serious. The number of fires and the area burned was greater in the 1980...

Ngày tải lên: 08/08/2014, 00:22