Báo cáo lâm nghiệp: "Photosynthesis and leaf longevity in alder, birch and ash seedlings grown under different nitrogen" ppsx

... Photosynthesis and leaf longevity in alder, birch and ash seedlings grown under different nitrogen levels T. Koike 1 M. Sanada 2 1 Swiss Federal Institute of Forestry ... rates and leaf longevity of deciduous broad-leaved tree seedlings in relation to the anatomical characteristics in leaves. Materials and Methods One yr old seedlings...

Ngày tải lên: 09/08/2014, 04:20

... acorns during winter. The insulating role of leaf litter along a winter season in a Q. faginea stand in the Zaragoza province was monitored to check its insulation capability. 2. MATERIALS AND METHODS 2.1. ... increasing order of frost resistance). Exotherms represented are obtained from mean values of starting point, width and duration of data obtained in thermal analysis. Time...

Ngày tải lên: 08/08/2014, 01:22

... differed in whether the main determinant of their increased growth rate at 27°C was increased net photosynthetic rate or rate of leaf produc- tion (Table III). The New Zealand ... species in Table II differed significantly (P = 0.0001) from the northern hemisphere species in Table I, in the differential be- tween optimal growing temperature...

Ngày tải lên: 09/08/2014, 04:20

... are usually low. Infested logs were brought to the laboratory and put into the light boxes. e hatched and emerged indi- viduals were captured daily in plastic jars and kept in refrigerator. ... Because of possible problems concerning the rearing of irradiated individuals, the rearing was done in large numbers of individuals and each dose was carried out in five replicatio...

Ngày tải lên: 07/08/2014, 03:22

... regeneration. CONCLUSION Comparing properties of the soil under blue spruce and Calamagrostis presented in this study resulted in detection of very little differences between upper horizons and the differences were in ... forest stands in moun- tain regions of the Czech Republic. Reference s BALCAR V., KACÁLEK D., 2008. European beech planted into spruce stands exposed to climat...

Ngày tải lên: 07/08/2014, 03:22

... very common and dominant species in the undergrowth in the study area. e plant species of the FA vegetation band are dominant, further the species of the QTA and QRC vegetation bands, possibly ... abies), and Carpathian pine (Pinus mugo Turra). VTs were named according to these tree species because of their dominance in certain zones. Some other tree species also occur in...

Ngày tải lên: 07/08/2014, 04:20

... (1988): SNAP – a scheduling and network analysis program for tactical harvest planning. In: Proceedings of International Mountain Logging and Pacific Northwest Skyline Symposium. Corvallis, ... cut in two adjacent strips against the prevailing wind, this system creates a spatial forest structure that mitigates wind damage risk by gradually increasing average tree height from the w...

Ngày tải lên: 07/08/2014, 10:21

... with a single exception of the fl ushing midpoint date, proving that the spa- tial arrangement of blocks used was very ineffi cient in handling the microenvironmental variation with- in the trial ... grid and their values for the positions of individual trees were estimated by ordinary point kriging. The evaluation of phenotypic variation (height, diameter, Julian days of spring flushin...

Ngày tải lên: 07/08/2014, 10:21

... beginning of longitudinal axial parenchyma (AP) formation. It was observed on May 14 in young trees. In the week before minimum and maximum temperature was 5.3°C and 23.2°C, respectively. In ... of Devo- nian origin and a part of the Adamovská vrchovina highland. As regards the type of relief, this is a part of broken highlands of folded and faulted structures and intrusi...

Ngày tải lên: 07/08/2014, 10:21

... study in the analysis of conducting area the relative conducting area (CA.k –1 ) and the respective index (CAar) were used. is index relates CA to the number of rings in sapwood, containing ... from the trend to increase ring conducting area with an improvement of the social class of tree position in the stand (Fig. 8A). Since the index is based on rings originating from sapwoo...

Ngày tải lên: 07/08/2014, 10:21