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• The Spanish fir (Abies pinsapo Boiss.) is a conifer endemic to southern Spain and belongs to a Mediterranean basin group of firs considered to be relict.
Megagametophyte storage proteins are a useful tool for the evaluation of genetic variability due to the haploid nature of
megagametophytes in conifers. 相似文献
2.
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• Multivariate statistical analysis was used to define different developmental stages for stone pine (Pinus pinea L.) considering tree size and cone production, without site-specific information. 相似文献
3.
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• The effect of water stress on host selection and performance during the shoot feeding phase, by the Mediterranean pine shoot
beetle Tomicus destruens, was studied. 相似文献
4.
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• We present the results of a two-year (2007–2008) greenhouse study investigating the effect of water availability and nitrogen
fertilization on the growth, biomass partitioning, and foliar nutrient content of Abies fraseri (Pursh) Poir. 相似文献
5.
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• We studied the effects of acorn cotyledon loss by insect damage and artificial excision on germination and seedling survival
of Quercus variabilis, to determine whether insect infestation decreases acorn germination and seedling establishment; and to what extent cotyledon
damage can affect acorn germination and seedling establishment. 相似文献
6.
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• This study investigated the short-term changes in neutral genetic variation that would occur if a mature, second-growth,
black walnut (Juglans nigra L.) stand was harvested following either a diameter-limited or value-limited cutting regime. 相似文献
7.
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• Considerable progress has been made recently to promote glue-laminated beams of European beech (Fagus sylvatica L.) for load-bearing structures in engineering. However, further investigations into the bond durability are required. The
objective of the present study was to analyse material and manufacturing factors and their combination to improve the resistance
in delamination tests as required for the use in building service class 1. 相似文献
8.
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• We aimed to better understand the genetic architecture of growth in E. globulus undergoing inbreeding by comparing families from selfing (SELF), open pollination (OP) and unrelated polymix crossing (POL)
of common parents. Stem diameter at breast height (DBH) was assessed at 4, 6 and 10 years after planting in a field trial. 相似文献
9.
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• To withstand and to recover from severe summer drought is crucial for trees, as dry periods are predicted to occur more
frequently over the coming decades. 相似文献
10.
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• Radiata pine (Pinus radiata D. Don) is the main exotic plantation tree species grown in New Zealand for wood production and as such represents a significant
component of the terrestrial carbon cycle. 相似文献
11.
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• We studied the differences in branch characteristics along the stems of six different genetic entries of 20 year old Scots
pines (Pinus sylvestris L.) grown at different spacing (current stand density range 2000–4000 trees ha−1) in central Finland. Furthermore, we studied the phenotypic correlations between yield, wood density traits and branch characteristics.
All the genetic entries had Kanerva pine (plus tree S1101) as a father tree, whereas the mother tree represented Finnish plus
trees from southern, central and northern Finland. 相似文献
12.
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• Plantation forestry in Zambia is based mainly on non-native Eucalyptus and Pinus species and constitutes an important component of the country’s economy. The productivity of these plantations is, however,
threatened by several factors, including fungal pathogens that reduce timber quality and cause tree mortality. 相似文献
13.
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• Vène wood (Pterocarpus erinaceus Poir.) is currently the favorite wood for manufacture of xylophone in Mali. A dynamic analysis method with free boundary
conditions, known as BING, was used to determine the main acoustic properties: specific dynamic modulus (E
L
/ρ), damping coefficient or internal friction (tan δ), sound radiation coefficient (SRC) and peak response (PR). 相似文献
14.
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• The aim of our work was to homogenise the meteorological dataset of German ICP Forests Level II sites (n = 73) by the aid of interpolations based on climate data from the German meteorological network (DWD). 相似文献
15.
Pinus brutia Ten. subspecies brutia, which occurs in the Eastern Mediterranean region, is the main forest species in Syria and important for multi-purpose forestry.
In this study, 6,631 10-year past growth diameter increment measurements were taken in 83 temporary sample plots. The current
breast height diameter of all trees was measured and a sample of trees was measured for height and age. The plots were placed
so as to capture the whole range of variation in site quality, stand age and stand density. The data were used to develop
the following models:
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Dominant height model: the guide curve method was used to fit an anamorphic site index model between stand age and dominant
height. 相似文献
16.
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• Effects of thinning on epicormics have rarely been demonstrated especially due to inaccurate surveying methods. 相似文献
17.
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• Paternity was established in a field trial of Abies nordmanniana with open-pollinated (OP) offspring from a clonal seed orchard (CSO) comprising 23 clones. 相似文献
18.
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• Tree mortality is an important process in forest ecosystem dynamics and is one of the least understood phenomena, because
of the complex interactions between different environmental stresses, minimal understanding of whole-plant mortality processes,
and a chronic shortage of data. 相似文献
19.
The effects of stocking on wood stiffness (MoE) for three Eucalyptus species are quantified using a 6-year-old trial established in New South Wales, Australia. An acoustic time-of-flight tool
measured the velocity between two probes in the outerwood, from which the stiffness was estimated. Four stocking levels (714,
1,250, 1,667 and 3,333 sph) were examined. Stiffness varied significantly between all species, with E. cloeziana showing the highest stiffness (14.2–15.7 GPa), followed by E. pilularis (12.2–13.5 GPa) and E. dunnii (10.7–12.6 GPa). There was a stiffness increase (around 11%) between 714 and 1,250 stems/ha for all species but thereafter
differences between stockings were not always significant. Trees were also assessed for basic density, dbh, total height, crown area, green crown height and stem slenderness (height/ dbh). Only stem slenderness had a significant association (0.41 ± 0.17) with stiffness. These findings suggest that, where stiffness
is a priority, forest managers could reduce establishment costs with low stockings (around 1,250 stems/ha).
相似文献
20.
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• We combined stem volume increment analysis with dendroecological tools to address two unresolved issues concerning oak dieback
in Mediterranean areas: early detection of changes in stand growth, and identification of mechanisms for observed growth declines. 相似文献
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