Báo cáo lâm nghiệp: "Effects of the clear-cutting of a Douglas-fir plantation (Pseudotsuga menziesii F ) on the chemical composition of soil solutions and on the leaching of DOC and ions in drainage waters" pps

... 10.1051/forest:2006103 Original article Effects of the clear-cutting of a Douglas-fir plantation (Pseudotsuga menziesii F. ) o n the chemical composition of soil solutions and on the leaching of DOC and ions in drainage ... species, a shortening of rotations and a mechani- sation of the thinning, harvesting and regeneration...

Ngày tải lên: 07/08/2014, 16:20

... Observations of changes in population levels of the main European forest insect pests during and after the drought are presented and discussed in the light of current knowledge and theories of interactions ... [27,67], and their capacity to escape un- favourable environmental conditions [58]. 2.1. Effects of summer heat on the survival of early instars of de...

Ngày tải lên: 07/08/2014, 16:20

... For. Fr. 2 (199 8) 124−137 (in French). [32] Hildebrand E.E., The in uence of soil compaction on soil func- tions in forest sites, in: Seminar on the impact of mechanization of forest operations on ... with a Monte Carlo test of significance (1000 permutations). The table shows the indicator value of each species (% of perfect indication, based on comb...

Ngày tải lên: 07/08/2014, 16:20

... 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 flushing and ... and adaptive traits in a provenance trial, and whether blocking can effi ciently handle this variation. MATERIALS AND METHODS  e study is based on the analysis of...

Ngày tải lên: 07/08/2014, 10:21

... by the reduction in stem number (N), basal area (G) and growing stock (GS ) as a percentage of the values per hectare before harvesting, and by the ratio q D of the quadratic mean diameters of ... Evolution of the population of crop trees in the thinned stands (T1 and T 2) in the period 1980–2001. Effects of selective thinning on beech forests 5...

Ngày tải lên: 07/08/2014, 16:20

... photosynthetically active radiation), at two water regimes (500 and 800 mm) and with two nutrient availabilities (standard substrate and 7% increase in soil N). The concentrations of soluble condensed ... Effect of daily supplementation of polyethylene glycol on intake and di- gestion of tannin-containing leaves (Quercus calliprinos, Pistacia lentiscus and Ceratonia s...

Ngày tải lên: 07/08/2014, 16:21

... Definition Si oak Site index expressed as dominant height at base age of 100 y (m) age oak Stand age of oak at measurement (a) mix Beech Admixture of beech as the basal area of beech/ total basal area ... growing space efficiency and thus crowds out oak [44]. Variations in weather can also have an impact on basal area increment [30]. Even though the evaluation dataset was base...

Ngày tải lên: 07/08/2014, 16:20

... 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 After thinning Thinning ... m 2 /5m 2 ) for each combination of plot and month. Annual leaf biomass was calculated by summing monthly leaffall. To quantify the phenological pattern of leaffall and the co...

Ngày tải lên: 07/08/2014, 16:20

... Coupled Plasma analysis (ICP) of leachates, leached and unleached samples. Analyses of boron amount remaining before and after leaching were realized after specimen’s extraction in hot water at 80 ◦ C ... loss Control (o) (o) (o)(0. 5) (0. 5) (0. 5) (0. 5) (1. 0) (1. 0) (1. 0) (1. 0) (C) Figure 4. Mass losses of C. japonica (C) and F. crenata (D) sap-...

Ngày tải lên: 07/08/2014, 16:21

... t-test). Using the analysis of variance the in uence of the factors clone, treatment and replication and their interactions on plant height and stem diameter of plants was studied in 2006 and 2007. ... to evaluate the stability of the degree of infection within the particular clones of black pop- lar in the years of observation, the relationshi...

Ngày tải lên: 07/08/2014, 10:21