Báo cáo lâm nghiệp: "Picea glauca dynamics and spatial pattern of seedlings regeneration along a chronosequence in the mixedwood section of the boreal forest" potx

... tremuloides and the resultant canopy gaps formed, appear to be critical for P. glauca regen- eration in mature and old stands. Natural regeneration may be enhanced by taking advantage of the advanced regeneration during ... Recruitment pattern of P. glauca seedlings changed along the chronosequence. L(t) analysis (Fig. 4) showed that the spatial distribution...

Ngày tải lên: 08/08/2014, 01:22

... BAL competition index measuring the total basal area of larger trees; T, G and SI are stand age (years), basal area (m 2 ha –1 ) and site index (m) at an index age of 100 years, respec- tively. ... in north-east Spain. The plots were located in the provinces of Huesca, Lérida and Tarragona. The plots were naturally regenerated and thinned after the second measurem...

Ngày tải lên: 08/08/2014, 01:21

... composition of forest stands being rather low, the study of the species and mainly of its root system has been paid little attention so far. Available data which are however of rather general character ... region of Krušné hory Mts. and in the region of Bohemian-Moravian Upland or in a mu- tual comparison between the two regions (see stand situation 5, mutu...

Ngày tải lên: 07/08/2014, 04:20

... is parameter is the main component of the classic Faustman model of periodical land revenue, and it is close to the com- mercial value of standing timber at the rotation age. In general, it ... represents the age of the synergic culminating effect (culminating mean increment) of technical, economic and value benefits of a forest stand, and depends on tree...

Ngày tải lên: 07/08/2014, 10:21

... surface, in an open area, and close to the most dam- aged locality. ey are changed in four-week inter- vals. e analysis of dosimeters and the calculation of concentrations are done by the ... taken separately (A) . e mixed stand sample was analyzed. e mixed sample was composed of three spots in each stand. Chemical analyses were done in the FGMRI labo- ratory...

Ngày tải lên: 07/08/2014, 10:21

... physiologically linked in poplars: drought-induced cavitation underlies branch dieback that re- duces transpiration demand enabling the remaining shoot to maintain a favourable water balance. Such an interpretation could ... potential all along the path- way. In addition, the decrease of soil-water content results in an increase of the hydraulic resistance within the s...

Ngày tải lên: 07/08/2014, 16:20

... including length of both tap and lat- eral roots, doubled from time of transplanting in April to first sampling in June in untreated controls and in seedlings in which whorl and lateral buds and ... taproot and lateral roots are scanned separately and that a resolution at 300 dpi with black and white background and threshold automatically gives the best corr...

Ngày tải lên: 07/08/2014, 16:20

... biomass allocation in Mediterranean pines 91 Table III. Proportion of the variance due to treatment, population and treatment by population interaction in the intra-specific analysis and significance ... the four populations together), the same ranking was found in both treatments for height and diameter growth, total biomass and leaf and stem biomass, with Pinus pinea...

Ngày tải lên: 07/08/2014, 16:20

... correlated with the stand basal area. As the size and/ or the stem density of the trees in a stand increases, the CFL and CBD also increase due to the higher fraction of avail- able crown fuel load. ... char- acteristics and stand structure parameters (Tab. IV). A strong positive correlation was found between CFL and stand basal area, and a weak positive corre...

Ngày tải lên: 07/08/2014, 16:20

... Universidad Austral de Chile for their logistic support and maintenance of the experiment, E. Gianoli for use of his IRGA and The Nature Conservancy and the Reserva Costera Valdiviana for ac- cess ... drought intensity [6] the same PPFD became probably saturating at a Ψ m lower than −2.5 MPa, producing the increase of NPQ in N. dombeyi and the concomitant decreas...

Ngày tải lên: 07/08/2014, 16:21