Comparative characteristics of bud meristem lipids from Picea obovata and Pinus sylvestris

2009 ◽  
Vol 45 (6) ◽  
pp. 792-796
Author(s):  
E. V. Alaudinova ◽  
P. V. Mironov
Keyword(s):  
Pinus Sylvestris ◽  
Picea Obovata

scholarly journals Preliminary evaluation for quality of dimension lumber in four common softwoods in Mongolia

2020 ◽  
Vol 66 (1) ◽  
Author(s):  
Murzabyek Sarkhad ◽  
Futoshi Ishiguri ◽  
Ikumi Nezu ◽  
Bayasaa Tumenjargal ◽  
Yusuke Takahashi ◽  
...  
Keyword(s):  
Pinus Sylvestris ◽  
Modulus Of Rupture ◽  
Preliminary Evaluation ◽  
Pinus Sibirica ◽  
Bending Properties ◽  
Picea Obovata ◽  
Dimension Lumber ◽  
Commercial Species ◽  
Characteristic Values

Abstract The quality of dimension lumber (2 by 4 lumber) was preliminarily investigated in four common Mongolian softwoods: Pinus sylvestris L., Pinus sibirica Du Tour, Picea obovata Ledeb., and Larix sibirica Ledeb. to produce high quality dimension lumber for structural use. In total 61, 39, 67, and 37 pieces of lumber were prepared for Pinus sylvestris, Pinus sibirica, Picea obovata, and L. sibirica, respectively. The lumber was visually graded and then tested in static bending to obtain the 5% lower tolerance limits at 75% confidence level (f0.05) of the modulus of elasticity (MOE) and the modulus of rupture (MOR). In addition, the effects of sawing patterns on bending properties were also analyzed. The f0.05 of the MOE and MOR were 4.75 GPa and 15.6 MPa, 3.39 GPa and 11.0 MPa, 3.78 GPa and 11.7 MPa, and 6.07 GPa and 22.3 MPa for Pinus sylvestris, Pinus sibirica, Picea obovata, and L. sibirica, respectively. These results suggested that with a few exceptions, characteristic values of MOR in the four common Mongolian softwoods resembled those in similar commercial species already used. In visual grading, over 80% of total lumber was assigned to select structural and No. 1 grades in Pinus sylvestris and Pinus sibirica, whereas approximately 40% of total lumber in L. sibirica was No. 3 and out of grades. Sawing patterns affected bending properties in Pinus sylvestris and L. sibirica, but did not affect Pinus sibirica and Picea obovata. Dynamic Young's modulus was significantly correlated with bending properties of dimension lumber for the four species. Based on the results, it was concluded that dimension lumber for structural use can be produced from the four common Mongolian softwoods.

A chronosequence of wood decomposition in the boreal forests of Russia

2003 ◽  
Vol 33 (7) ◽  
pp. 1211-1226 ◽  
Author(s):  
Mikhail Yatskov ◽  
Mark E Harmon ◽  
Olga N Krankina
Keyword(s):  
Pinus Sylvestris ◽  
Boreal Forests ◽  
Woody Debris ◽  
Decay Resistance ◽  
Pinus Koraiensis ◽  
Decomposition Rates ◽  
Specific Density ◽  
Picea Obovata ◽  
Temperature And Precipitation ◽  
The Mean

Coarse woody debris (CWD), represented by logs and snags >10 cm in diameter and >1 m in length, was sampled at eight sites in Russian boreal forests to determine the specific density of decay classes and decomposition rates. Tree species sampled included Abies siberica Ledeb., Betula pendula Roth., Betula costata Trautv., Larix siberica Ledeb., Larix dahurica Turcz., Picea abies (L.) Karst., Picea obovata Ledeb., Picea ajanensis Fisch., Pinus koraiensis Sieb. et Zucc., Pinus siberica Ledeb., Pinus sylvestris L., and Populus tremula L. The mean densities for decay clas ses 1 through 5 ranged from 0.516 to 0.084 g·cm–3, respectively. Annual decomposition rates varied among the species, and for logs, decomposition rates ranged from 4.2 to 7.8% for B. pendula, 2.6 to 4.9% for Picea spp., 2.7 to 4.4% for Pinus sylvestris, 1.5 to 3.1% for Larix spp., and 1.5 to 1.9% for Pinus koraiensis and Pinus siberica. Logs decomposed faster than snags. Among the sites examined, temperature and precipitation did not correlate with decomposition rates, which is consistent with other studies in the boreal region. Globally, a positive correlation between decomposition and mean annual temperatures was found, with decay-resistant trees less responsive than those with low decay resistance.

Генетическая изменчивость в популяциях Pinus sylvestris, Picea obovata, Abies sibirica и на вырубках в южной тайге Средней Сибири

2021 ◽  
Vol 57 (3) ◽  
pp. 296-310
Author(s):  
И. В. Тихонова ◽  
А. К. Экарт ◽  
А. Н. Кравченко ◽  
Н. А. Тихонова
Keyword(s):  
Pinus Sylvestris ◽  
Picea Obovata ◽  
Abies Sibirica

Morphophysiological responses of Pinus sylvestris L. and Picea obovata Ledeb. to industrial pollution under conditions of Northwestern Russia

2011 ◽  
Vol 42 (1) ◽  
pp. 22-29 ◽  
Author(s):  
V. B. Pridacha ◽  
T. A. Sazonova ◽  
T. Yu. Talanova ◽  
A. V. Ol’chev
Keyword(s):  
Pinus Sylvestris ◽  
Industrial Pollution ◽  
Picea Obovata ◽  
Northwestern Russia
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