Báo cáo lâm nghiệp: "Effect of stand segmentation on growth and development of Norway spruce stands" pps

... international IUFRO experiment dealing with the ra - tionalization of young spruce stand tending (A 1977). One part of this series, Machov CZ 14 experi- Effect of stand segmentation on growth and ... values (mean and standard deviation) of stand volume (open triangles) and volume of mean stem (grey circles) of spruce stands in Machov experiment at the...

Ngày tải lên: 07/08/2014, 03:22

... the position towards the focus of biotic pest activity, stand age, and the proportion of spruce in a given stand.  e fourth Table 2. Forest damage classifi cation and assignment of binary ... older stands, higher proportion of spruce, location in the vicinity of the focus of biotic agent activity, and growing at drier sites (the order is based on Wald statistics...

Ngày tải lên: 07/08/2014, 10:21

... relevés from the control stands (R3 and R4 versus R7 and R8) indicates differences in site conditions between plots P1 and P2 (Fig. 6 and Tab. VII). 4. DISCUSSION AND CONCLUSIONS Thinning caused ... high number of crop trees in the young stands and al- teration of crop trees caused one of the main weaknesses of the selection thinning type, namely, high costs. In the total...

Ngày tải lên: 07/08/2014, 16:20

... (M327). The spruce and bog pine mixed stand of phytocoenosis No 2 shows a simpler vegetation structure (Figs. 4 and 5, ³³ Succession from bog pine to Norway spruce stands 353 mixed stand, and other ... [24], and the one of other bryophytes Corley et al. [9]. 2.3. Tree stand structure On a surface of 400 m 2 of the bog pine and Norway spruce mixed stand (p...

Ngày tải lên: 08/08/2014, 01:21

... 4, Switzerland Introduction The study of the cell wall-plasma mem- brane interphase is of great importance for the understanding of gaseous air pollu- tants and leaf cell interactions. ... without disruption of homeostasis. Based on these observations, it ap- pears that the apoplast of Norway spruce needles is a sensitive site for the detect...

Ngày tải lên: 09/08/2014, 04:20

... effect of gibberellic acid and ethephon on overcoming beechnut dormancy and stimulation of beechnut germination. MATERIALS AND METHODS Seeds ree beechnut seedlots with a moisture con- tent of ... 4; Fig. 2). We found no apparent effect of different concen- trations of ethephon or GA 3 on germination ca- pacity. e only exception was the application of 1,000 mg·l –1 GA...

Ngày tải lên: 07/08/2014, 10:21

... Individual dispositions of tree, site and climatic conditions of each tree contribute to their forma- tion. Possible damage to trees and change in the growth conditions are frequent reasons for incre- ment ... precipitation of the actual year is most significant for 100% of trees and for almost 80% of trees in this stand, and only for 10% or 5% of trees the precipit...

Ngày tải lên: 07/08/2014, 10:21

... in Changing Environmental Conditions. Effect of initial height of seedlings on the growth of planting material of Norway spruce (Picea abies [L.] Karst.) in mountain conditions A. J, J. ... mountain population of Norway spruce after their planting in extreme mountain conditions compared to the develop- ment of seedlings of standard and large dimensions. MAT...

Ngày tải lên: 07/08/2014, 10:21

... temperature and rainfall during the five years of study with Pearson correlation based on a significance level of 5% with the t test. The effect of age of the plantation on monthly mean annual number of ... (ºC) and rainfall (mm) (A) and total number of individuals of Lepidoptera (B) and of major (C) and lesser (D) important pests collected in a Eucalyptus grandi...

Ngày tải lên: 08/08/2014, 00:21

... Turkey, and Israel [27]. Further studies are needed to clarify the taxonomic position of the studied populations. Th. pityocampa Schiff is known to feed on leaves and build large silk nests on the ... nests on the top of the trees. In addition, PPM has urticating hairs, which cause allergies resulting in conjunctivitis, respiratory congestions and asthma [29]. The PPM is one...

Ngày tải lên: 08/08/2014, 00:21