Báo cáo lâm nghiệp: "resistance of two Douglas fir species (Pseudotsuga menziesii (Mirb ) Franco and Pseudotsuga macrocarpa (Torr ) Mayr ): relative importance of water use efficiency and root growth potentia" pptx

... c7Elc?A at high water poten- tial (Fig. 2b). Growth of the pre-existent roots was more important in P. macrocarpa than in P. menziesii and growth of the new roots was similar ... was increased (Fig. 1 b). P. macrocarpa had the highest and the most unstable - and thus non-optimal - values of aEf7A in response to in- creasing AW (Fig....

Ngày tải lên: 09/08/2014, 04:20

... FOR. SCI., 56, 2010 (1 2): 609–613 609 JOURNAL OF FOREST SCIENCE, 56, 2010 (1 2): 609–613 Comparison of two types of ECOLURE lure on Ips typographus (L .) (Coleoptera: Scolytidae) O. N 1 , J. ... Influence of mass trapping on the population dynamic and damage-effect of bark beetles. Journal of Applied Entomol- ogy, 114: 103–109. J R., B M. 200...

Ngày tải lên: 07/08/2014, 10:22

... 36.2 (4 4) 256 118 (6 2) 64.6 33.6 (2 2) Roots (0–20 cm) 17.1 6.7 ( 8) 36.4 18.8 (1 0) 21.0 10.9 ( 7) Total biomass 86.8 42.9 (5 2) 292.4 136.8 (7 2) 85.6 44.5 (2 9) Litter 11.1 4.5 ( 5) 4.7 1.9 ( 1) 5.3 ... the other two forests (VC and NE), while these last two forests had similar litter mass (Tab. II). In the first 20-cm depth of soil, VC had higher...

Ngày tải lên: 07/08/2014, 16:20

... one standard error of the mean. 1998 1999 2000 C 2365 (118 6) 3105 (85 1) 1782 (49 9) I 3511 (107 8) 5164 (57 0) 4105 (70 4) F 3386 (94 2) 6394 (83 7) 6403 (105 4) IF 3919 (90 4) 5014 (77 9) 5484 (110 6) Figure ... effects; MS(e) ijkl for the Dl (BD) jl , (CD) kl and (BCD) jkl effects. 3. RESULTS The growth of ground vegetation increased as a res...

Ngày tải lên: 08/08/2014, 01:21

... sum- mer of 1994, with 140 plants, of pedunculate (Q robur (L )) and sessile (Quercus petraea [Matt] Liebl) oak in the experimental garden of the Insti- tute of Silviculture of ... field and showed no differences between well- watered and nonwatered plants, indicating that water supply was not limiting (figs 1, 2 and 3, table I). Thus,...

Ngày tải lên: 08/08/2014, 18:21

... (1987b) The influence of constant long-term water stress on net photosynthesis and growth of young spruces (Picea abies [L.] Karst) and Douglas firs (Pseudotsuga menziesii ... References Gross K. (198 8) Net photosynthesis, biomass production and water- use efficiency of young Norway spruces and Douglas firs, given dif- ferent levels...

Ngày tải lên: 09/08/2014, 04:20

... all species on days of extreme (wet, dry) environmental conditions. The water use efficiency of photosynthesis (WUEP) was calculated as photosynthetic rate (pmol ’ m- 2’ s- 1) over ... 198 6) and that the more drought-adapted species tolerated higher internal water stress. The mean diurnal photosynthetic rates of all species were relativ...

Ngày tải lên: 09/08/2014, 04:20

... (2007a): Natural regeneration of Douglas fir. Les- nická práce, 12: 24–25. (in Czech) B F. 2007b): Natural regeneration of Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) in forest stands ... J M.F. (198 9): Effect of site preparation on survival and growth of Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) seedlings. New Forests, 3: 8...

Ngày tải lên: 07/08/2014, 03:22

... of litterfall in a chronosequence of Douglas- fir (Pseudotsuga menziesii Franco) stands in the Beaujolais mounts (France), Ann. For. Sci. 60 (200 3) 475–488. [48] Roberts J., Hopkins R., Morecroft ... the importance of leaf area in forecasting forest growth, particularly in stands impacted by insects or disease. The influence of Swiss needle cast (SNC) on coastal Douglas...

Ngày tải lên: 07/08/2014, 16:20

... in two softwood species (spruce and Douglas fir), on both normal wood and reaction wood. Of the principal results obtained, reference should be made to the low shrinkage and high anisotropy of ... effects of species and growth conditions (silviculture, cli- mate, etc .) on shrinkage, we need to determine how each of these component tissues shrinks freely and separ...

Ngày tải lên: 07/08/2014, 16:20