Báo cáo lâm nghiệp: "Predicting site productivity and pest hazard in lodgepole pine using biogeoclimatic system and geographic variables in British Columbia" potx

... article Predicting site productivity and pest hazard in lodgepole pine using biogeoclimatic system and geographic variables in British Columbia Harry X. WU a *, Cheng C. YING b , Hong-Bo JU c a ... has been expanded to interior spruce (Picea engel- mannii Parry and P. glauca (Moench) Voss) and lodgepole pine (Pinus contorta Dougl.) in site producti...

Ngày tải lên: 08/08/2014, 00:21

... Radial and volume increment losses Radial and volume increment losses were assessed on the basis of standardized ring width and periodic annual increment in volume, respectively, in order to eliminate ... (1965–1995) that covers the last insect outbreak. Defoliation variables explained 36% and 23% of the annual changes in ring width index and annual volume increment index, r...

Ngày tải lên: 08/08/2014, 00:21

Ngày tải lên: 07/08/2014, 16:20

... suber) and stone pine (P. pinea) being exceptionally fire tolerant. The high sur- vival rate of cork oaks can be explained by its thick bark and re-sprouting capability [28]. In the case of stone pine, ... one hand, the size and position of the tree in the diame- ter distribution (dand BAL), and the structure of the stand (D g , s d /(D g + 0.01) and G), on the other hand. Va...

Ngày tải lên: 07/08/2014, 16:21

... clones within full-sib fami- lies, and e is a vector of random residual terms. X, Z 1 , Z 2 and Z 3 are known incidence matrices relating the observations in y to effects in b, a, f and c, respectively. ... of parents and clones within full-sib families were obtained from the heterogeneous variances model, and from a simpler model assuming variance homogeneity across trial sit...

Ngày tải lên: 08/08/2014, 00:21

... [14] and, perhaps, the expanding internodes of young stems. Thus, a certain number of young leaves and internodes may need to have been devel- oped in order for the auxin-dependent pre-condition ... 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 for the in...

Ngày tải lên: 08/08/2014, 00:22

... different thermal chocks and control situation. Control 50ºC 75ºC 100ºC 125ºC 1 min 5 min 10 min 15 min 1 min 5 min 10 min 15 min 1 min 5 min 10 min 15 min 1 min 5 min 10 min 15 min Halimium alyssoides ... 2 Control 70 ºC 90 ºC 110 ºC 130 ºC 150 ºC 170 ºC 190 ºC 1 min 5 min 1 min 5 min 1 min 5 min 1 min 5 min 1 min 5 min 1 min 5 min 1 min 5 min Pinus sylvestris 94 94 95 93 90 92 8 78 0 27...

Ngày tải lên: 08/08/2014, 01:21

... vanishes. Finally, the order 0 is required to close the problem. Keep- ing in mind that is anti-periodic and integrating the resulting equation over the unit cell, we finally obtain: .(10) This ... Geometry and Transports – Butterworth-Heinemann Series in Chemical Engineering, 1992. [2] Astley R.J., Harrington J.J., Stol K.A., Mechanical Modelling of Wood Microstructure, an Engineerin...

Ngày tải lên: 08/08/2014, 01:21

... (6): 290–298 and managing responsibly. Openness and flexibility in reacting to changing societal needs and values, understanding of the ecological, social and economic drivers determining their ... coni- fers were systematically favoured because the thin- ning and final felling of even-aged stands allowed a rapid increase in wood production to meet economic demands. In the A...

Ngày tải lên: 07/08/2014, 03:22

... cutting points was indifferent for the young pines, at 60% and 80% of the stem height for the old pines, at 20% and 60% or at 40% and 60% for the spruces and at 20% and 40% for the mountain ashes. ... point at the stem. For trees divided into two strata and without de- leting the stem segments, more precise estimates are observed for European mountain ashes and old pines. Fo...

Ngày tải lên: 07/08/2014, 03:22