Báo cáo lâm nghiệp: "Efficiency of early selection for rotation-aged wood quality traits in radiata pine" pdf

... years for density including ear- lywood and latewood density [22]. Early selection for radiata pine (Pinus radiata) has been examined in growth and wood density. Cotterill and Dean [6] observed early ... as for wood density, the age-age genetic Early selection for wood quality traits in radiata pine 3 (2) age trend of heritability of these traits; (3)...

Ngày tải lên: 07/08/2014, 16:20

... dates, again dispersed over the whole season, using a 5-stage scale (1 – green leaves, 2 – beginning of autumn colouring of individual leaves, 3 – beginning of autumn leaf colouring on a ... 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 flushing...

Ngày tải lên: 07/08/2014, 10:21

... Summary report by the ministry of agriculture of the Czech Republic of the situation in agriculture, food-processing industry, forestry and water management in the year 2003, in: Ministry of Agriculture, Summary ... foliage quality and increase insect perfor- mances [50,60]. During, drought, the increase in nitrogen con- centration usually stimulates insect feeding [60], but...

Ngày tải lên: 07/08/2014, 16:20

... 513−519. [32] Martin J.S., Martin M.M., Tannin assays in ecological studies: lack of correlation between phenolics, proanthicyanidins and protein- precipitating constituents in mature foliage of six oak ... as in [30]. Briefly, 0.5 mL of the extract were mixed with 3 mL butanol- HCl (95:5) and 0.1 mL of ferric reagent (ferric ammonium sulfate in 2 N HCl) and maintained in a b...

Ngày tải lên: 07/08/2014, 16:21

... distribution of rust infection re- mained stable in the tested set of clones during the trial.  e intensity of infection during the growing sea- son in 2005 and 2007 was evaluated in the same ... t-test Table 5. Increments of stem diameter and plant height from the beginning of vegetation to the fi rst rust incidence (beginning of July 2007) and their percent proportion i...

Ngày tải lên: 07/08/2014, 10:21

... explain differing growth pat- terns of social classes in pure, one-layer stands [12]. For example, oak γ remains constant but σ changes with thinning, while for beech γ increases after thinning ... function of DBH 466 S. Hein, J F. Dhôte oak should be favored in thinnings of mixed oak-beech stands to prevent a decrease in its basal area increment. In order to ensure a high di...

Ngày tải lên: 07/08/2014, 16:20

... area in the study plots. Thinning was performed in 1984. Values (stem number and basal area just before and after thinning and thinning ratio) are shown for 1984 and 1995. Plot Before thinning ... growth of surviving individuals (i.e., survivor growth) + BA of individuals that attained the minimum DBH during a measurement period, i.e., ingrowth [2]. We evaluated the loss of BA as...

Ngày tải lên: 07/08/2014, 16:20

... carbon mineralization For all the samples, the cumulated rates of carbon min- eralized, expressed in proportion of total carbon as CO 2 - C% of Ct, showed a linear kinetic during the incubation ... improves soil quality of sloping oak stands in a German low mountain range, Ann. For. Sci. 62 (2005) 23–29. [31] Paavolainen L., Kitunen V., Smolander A., Inhibition of nitrifica...

Ngày tải lên: 07/08/2014, 16:20

... type of thinning, intensity (grade), re- turn interval, and the timing of the first thinning [48]. Two major types of thinning used in forest tending are low (from below) and high (from above) thinning. ... processes, are involved in crop tree selection. Before the next thinning, the selection of crop trees may be slightly different because of an insufficient reaction of forme...

Ngày tải lên: 07/08/2014, 16:20

... when the soil lays bare in a sloping relief [23]. The issue of the loss of nutrients in drainage water is cen- tral for soil quality changes and for the impact of forestry in the environment. Situations ... consequence of slash management (e.g. burning and windrowing), (ii) the scalping and/or re- moval of forest floor caused by machinery (harvesting and site preparation)...

Ngày tải lên: 07/08/2014, 16:20