Báo cáo lâm nghiệp: "Modeling lumber recovery in relation to selected tree characteristics in jack pine using sawing simulator Optitek" ppsx

... INRA, EDP Sciences, 2005 DOI: 10.1051/forest:2005013 Original article Modeling lumber recovery in relation to selected tree characteristics in jack pine using sawing simulator Optitek Shu-Yin ... adequate in estimating jack pine lum- ber volume recovery from the stud mill using DBH only. 4.2. Lumber recovery in relation to DBH and tree height...

Ngày tải lên: 08/08/2014, 00:21

... (1998) 1–11. [27] Niinemets Ü., Kull O., Biomass investment in leaf lamina versus lamina support in relation to growth irradiance and leaf size in tem- perate deciduous trees, Tree Physiol. 19 (1999) ... of tree saplings, but among species, there is a large inter-specific variability in the degree of tolerance to shade. The ability of trees to acclimate to shade is impor...

Ngày tải lên: 08/08/2014, 00:22

... due to the fact that sampling steps such as felling, transportation, sawing and conditioning are avoided. This spared money could then be used to increase the intensity of selection to obtain ... clones was selected in a clonal test established in Virton (Walloon Region, Southern Belgium) in 1982. Thirty-two trees consisting of 2 ramets 3 per clone were selected from the do...

Ngày tải lên: 08/08/2014, 01:22

... following thinning can reduce demand for water resulting in increased water availability in the rooting zone [24]. McDowell et al. (in review) have also shown that decadal thinning to main- tain ... might increase following thinning [15] because of increased illumination of crowns stimulating stom- atal opening [21] and greater wind loading [35] increasing atmospheric moisture demand....

Ngày tải lên: 08/08/2014, 00:22

... 8). Growing stock e growing stock development (m 3 /ha) compiled again according to the particular species in five-year intervals is given in Table 9. e total growing stock in- creased from initial ... Mill. living trees dead trees living trees dead trees living trees dead trees living trees dead trees living trees dead trees living trees dead trees Traditional parameters number...

Ngày tải lên: 07/08/2014, 03:22

... monitoring of the tree layer in a mixed stand in the region of the Drahanská vrchovina Upland in 2004–2007. e onset and duration of particular phenological stages are described in monitored ... according to a thresh- old value T5°C and T0°C was used. e long-term monitoring of phenology and photosynthetic proc- esses of trees in the region shows that physiological process...

Ngày tải lên: 07/08/2014, 03:22

... dealing with draining waterlogged forest catchments and growing stands in relation to runoff, assessed total runoff and its extremes in the progress of time. Unlike them we dealt with dividing ... order to restore discharge conditions in the wa- tershed. In 1996, drainage ditches were dug to meet the following requirements in the core area of the watershed of approximatel...

Ngày tải lên: 07/08/2014, 03:22

... occurred and in consequence, salvage fell- ing wood was processed amounting to 3 million m 3 (spruce 74.5%, pine 23.3%) in stands aged over 40 years in the Czech Republic. In stands up to 40 years, ... related to changes induced by damage but also to the microclimate of a lying break in the stand. Breaks with the crown dry differently from a standing tree. Intensity...

Ngày tải lên: 07/08/2014, 04:20

... collectors was reduced to 5 during winter. Bulk atmospheric precipitation was sampled with one collector in the nearby open area. Samples were taken once a month in the winter season and in ... 14-day intervals in the other seasons. Samples were transferred to the laboratory and prepared for the analyses usu- ally the next day after the sampling. In winter it was sometimes...

Ngày tải lên: 07/08/2014, 04:20

... tree layer recruits. According to Hopkins-Skellam and Clark-Evans indices the combined regenera- tion on this PRP shows a moderately regular pat- tern whereas according to Pielou-Mountford index ... distribution of the tree layer individuals was random according to two structural indices (Hopkins-Skellam and Pielou- Mountford) and regular according to Clark-Evans index. Ripley...

Ngày tải lên: 07/08/2014, 10:21