Báo cáo lâm nghiệp: "Comparison of physical and mechanical properties of tension and opposite wood from ten tropical rainforest trees from different species" pptx

... I. Radius and Growth Strains (×10 −6 ) mean value of tension wood and opposite wood zone from the ten studied trees. Radius Radius GS mean GS mean Family Genus species author of TW of OW value ... to poplar trees, Ann. For. Sci. 60 (2003) 371–378. [17] Coutand C., Jeronimidis G., Chanson B., Loup C., Comparison of mechanical properties of tension and oppo...

Ngày tải lên: 07/08/2014, 16:21

... 52182 Testing of wood; determination of density, 1976. [9] DIN 52183 Testing of wood; determination of moisture content, 1977. [10] DIN 52184 Testing of wood; determination of swelling and shrinkage, 1979. [11] ... loss of finan- cial value of beech [12]. The colour of wood is an important factor for end user to consider and the price of wood is often dependent...

Ngày tải lên: 08/08/2014, 00:22

... 208–214 JOURNAL OF FOREST SCIENCE, 55, 2009 (5): 208–214 Nutrient content as well as other chemical and physical properties of soils are the consequence of bedrock, abiotic soil forming factors and impact ... higher (152 and 140 kg/ha). Contents per ha of other nutrients differed up to few percent. Total content of oxidable carbon was 16% higher by CV variant (52 and...

Ngày tải lên: 07/08/2014, 03:22

... the wood of standing living trees. Some fungi of the latter group can invade and kill living sapwood causing death to living trees (D et al. 2007), others live in the heartwood of living ... samples of leaves and cupules for species identification were easily taken away from upper insolated parts of crowns of the previously measured trees. After that, diameters at e...

Ngày tải lên: 07/08/2014, 03:22

... deposition fluxes of Ca, Mg, K, S-SO 4 , N-NO 3 and N-NH 4 in the dense and sparse spruce stand were 15.7 and 11.6, 4.2 and 3.0, 19.2 and 12.7, 22.5 and 16.4, 8.9 and 7.4, 7.7 and 6.6 kg/ha, ... in throughfall and rainfall sums were the result of different leaf area index and stand density of the studied stands. Water intercepted by the stand canopy of the...

Ngày tải lên: 07/08/2014, 04:20

... e dry weight of root systems and shoots, i.e. the dry weight of stem and branches and total dry weight of needles, was markedly lower in plugs. e mean dry weight of one needle and needle density ... results of the analyses of basic nutrient content in needles (Table 2) indicated higher contents of N, K and Mg in plugs compared to bareroot trans- plants. On the ot...

Ngày tải lên: 07/08/2014, 10:22

... – To face the lack of information of C content in the main forest ecosystems pools from Spain and Latin America, this study compares C pools of three forest ecosystems: a tropical deciduous forest ... contents in the main pools of ecosystems, be- ing a general rule relating forest from Spain and Latin Amer- ica. The lack of this information in some regions constrains the u...

Ngày tải lên: 07/08/2014, 16:20

... the other hand, Lambeth et al. [19], in E. grandis and Menck and Table IV. Comparison of means (and associated F-test) between cuttings and seedlings and variances values for family and clones (and ... sys- tems between cuttings and seedlings of E. globulus have been reported for this species by Sasse and Sands [25] and Sasse and Sands [27]. These authors reported more...

Ngày tải lên: 08/08/2014, 00:22

... present in wood and its absorption band. Barker and Owen [4]; Michell and Higgins [23]. Chang and Chang [7]. Functional groups of old wood and new wood. Functional group Wavenumber (cm –1 ) Old wood ... hygroscopic response of the juvenile wood of Pinus sylvestris L. from recently cut trees from the Valsaín Forest in Segovia, Spain (new wood) was compared to t...

Ngày tải lên: 08/08/2014, 00:22

... constant of water (K w ), which is temperature-dependent, ranges from 74 to 84 and is about 20- fold higher than that of mineral solids (between 3 and 5), and about 80-fold higher than that of air ... distribution. A “flowing-off” effect was observed, followed by a progressive re-wetting of the soil profile from the bottom. Both the temporal and spatial variabilities of...

Ngày tải lên: 08/08/2014, 01:21