Báo cáo lâm nghiệp: "Predicting the vertical location of branches along Atlas cedar stem (Cedrus atlantica Manetti) in relation to annual shoot length" pdf

... 57–62 Because of the lack of a recent survey of Cephal- cia species in the Czech Republic, the goals of this study were (i) to monitor web-spinning sawflies liv- ing on spruce in mountainous regions ... species occurrence. Canonical axes explain 65.8% of variability J. FOR. SCI., 53, 2007 (Special Issue): 57–62 59 Table 1. Survey of studied web-spinning sawflies...

Ngày tải lên: 07/08/2014, 03:22

... (1 n/N) ì 2 /n, 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 ... samples of size 100, 32 of size 110, and 4 of size 121. In sampling a nonrectangular area, variability of the sample size will further be increased depend- ing on the...

Ngày tải lên: 07/08/2014, 03:22

... variables, the stratification of the crown and the deletion of segments. In the present study, the effects of the choice of the auxiliary variable and of the created crown structure (segments and nodes, ... dele- tion of the stem segments. After this closer look at the old pine, the effect of stratification and deletion of the stem seg...

Ngày tải lên: 07/08/2014, 03:22

... Supported by the Federal Ministry of Food, Agriculture and Consumer Protection and by the Vattenfall Europe Min- ing AG. Assessing the short rotation woody biomass production on marginal post-mining ... supported by the fact that the hedgerows result in higher crop yields compared with conventional agriculture. Regardless of the economic assessment of the prod...

Ngày tải lên: 07/08/2014, 10:21

... (without the ending and often extended hairs), metatarsal length (LTp) from the calcaneal joint to the tip of the hoof, ear length (LA) from the root of the ear to the tip, and height at the withers ... as the distance from the tip of the fore leg to the highest point at the withers. Weight was deter- mined according to circumstances: (i) the whole un...

Ngày tải lên: 07/08/2014, 10:21

... angle. between the height of insert point of the highest branch and the height of insert point of the branch of interest). In every annual shoot of the stem, the branches were ordered from the top to the ... Branch location on Atlas cedar tree stem 717 the growth rate of the parent shoot. In particular, the great ex- tent of the ne...

Ngày tải lên: 07/08/2014, 16:21

... 14-04-1999. The vertical and horizontal lines in the graph represent the threshold values for the accumulation of the indicated secondary vascular cell types. For periclinal divisions in the cambium, and ... estimated in the two direc- tions. In the first case, fusiform cells were counted along the radial files in the xylem portion of the cambiu...

Ngày tải lên: 08/08/2014, 00:22

... view of practitioners in the beech plenter forest in Thuringia [9, 12–15]. They all considered a standing volume of about 250 m 3 /ha to be the upper limit to maintain the plenter system in these ... much higher in beech forests than in conifer-dominated ones. It also explains why there has been little or no success in the past when applying the principles...

Ngày tải lên: 08/08/2014, 00:22

... susceptible hosts are located within the shaded area (Jianghua Sun, 2004, unpublished data). 126 A. J. Carnegie et al. There are large areas of forests of P. massoniana in the south-east of China and of Larix ... 10.1051/forest:2005104 Original article Predicting the potential distribution of Sirex noctilio (Hymenoptera: Siricidae), a significant exotic...

Ngày tải lên: 08/08/2014, 00:22

... 355 c  INRA, EDP Sciences, 2006 DOI: 10.1051/forest:2006016 Original article On the niche breadth of Fagus sylvatica: soil nutrient status in 50 Central European beech stands on a broad range of bedrock ... among the sites than do actually exist in the main rooting horizon. A major disadvantage of our study is the lack of appropriate...

Ngày tải lên: 08/08/2014, 00:22

... 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 ... 2002076 Original article Predicting the probability of seed germination in Pinus sylvestris L. and four competitor shrub sp...

Ngày tải lên: 08/08/2014, 01:21

... 10.1051/forest:2003009 Original article Growth and biomass partitioning of Fagus sylvatica L. and Quercus robur L. seedlings in response to shading and small changes in the R/FR-ratio of radiation Christian ... seedlings of Fagus sylvatica L., Tree Physiol. 17 (1997) 133–140. [52] Welander N.T., Ottosson B., The influence of shading...

Ngày tải lên: 08/08/2014, 01:21

... characteristics, the time since last thin- ning τ and the thinning intensity I were retained for this study. Thin- ning intensity I is defined in terms of basal area, being equal to the ratio of absolute ... since thinning increased (data not shown). Thus the influences of stand age, time since last thinning and intensity of last thinning on extinction coefficient b (relat...

Ngày tải lên: 08/08/2014, 01:22

... 2004 DOI: 10.1051 /forest: 2004019 Original article Modelling the biomechanical behaviour of growing trees at the forest stand scale. Part I: Development of an Incremental Transfer Matrix Method and ... and efficient method to simulate the biomechanical behaviour of growing trees. Nevertheless, the use of numerical methods at t...

Ngày tải lên: 08/08/2014, 01:22

... which had more basic ones. A similar distribution was observed in tobacco (Cabanne et al., 1977). These biochemical changes of early stages of initiation have yet to be verified in ... trees makes the sampling problem for biochemi- cal studies on the early steps of flowering a crucial one. Another approach to this problem is to find a...

Ngày tải lên: 09/08/2014, 04:20