Báo cáo lâm nghiệp: "Stratifying, partially redrying and storing Douglas-fir seeds effects on growth and physiology during germination" doc

... which often Stratifying, partially redrying and storing Douglas-fir seeds : effects on growth and physiology during germination * Marlene DE MATOS MALAVASI, and D.P. LAVEN Susan ... (table 1 ), and effects of redrying- and storage on whole seeds and seed parts, seed vigor, and seedling growth were assessed under the various tr...

Ngày tải lên: 09/08/2014, 06:21

... 1986). On one hand, the liming could increase an exchange- able P content by raising the soil reaction (pH) and promoting mineralization of SOM, on the other hand this treatment adds Ca cations ... different Table 5. N, P and K concentrations (% of dry matter) in birch leaves Year/variant N (%) P (%) K (%) control limestone basalt control limestone basalt control limestone basalt 19...

Ngày tải lên: 07/08/2014, 10:22

... umbrisol Texture, Ah horizon (%) Sands 60, silts 14, and clays 26 Sands 44, silts 24, and clays 31 Sands 22, silts 38, and clays 21 Bulk density, Ah horizon (g cm −3 ) 0.9 1.0 0.8 pH, Ah horizon (H 2 O) 6.5–7.0 ... these emissions reductions (under Article 3.3); among these activities reforestation and protec- tion of forested areas can be relevant [46]. On average, soils are the la...

Ngày tải lên: 07/08/2014, 16:20

... acidification and liming on tree nutrition 863 Figure 1. Mean N concentrations of current (C), current + one year (C+1), and current + two year needles (C+2) at the A1 (control), B1 (acid irrigation), ... trends of nutrient concentrations in the needles. 2. MATERIALS AND METHODS 2.1. Site and stand description The Höglwald is a long-term ecological monitoring and experi- mentation...

Ngày tải lên: 07/08/2014, 16:20

... to the evolution and function- ing of such a model of colonization and competition between species, detailed studies are needed. The evaluation of the ex- tent of hybridization and hybrid fitness ... populations (natural regener- ations and progeny plantations) were statistically significant at p < 0.001. 4. DISCUSSION If we consider only the species composition of maternal se- lecte...

Ngày tải lên: 07/08/2014, 16:21

... rotation of eucalypts plantations [19], and the environmental conditions are mod- ified (e.g., soil water content, absence of root exudates and root uptake). Although experimental conditions have ... management on tree nutrition status and growth, N in soil solutions and soil fertility [9, 19]. In contrast to results reported by Powers et al. [30], Nzila et al., [25], Turner and G...

Ngày tải lên: 07/08/2014, 16:21

... factor for carbon assimilation in Scots pine. 5. CONCLUSIONS Whereas temporal variation in needle d 13 C depends on the environmental changes during the annual cycle and the physiology of the ... higher precipitation than the years 1996 or 1997 (1106 mm in 1998 versus 794 mm in 1997 and 629 mm in 1996). Increased precipitation could on one hand reduce hydraulic restraints and...

Ngày tải lên: 08/08/2014, 01:21

... treatment during the growing season of 1998, irrigation was reduced during 1999 and mean irrigation amounted to about 44 mm month –1 . During the growing season of year 2000, no irrigation was done. In ... interactions (AB)ij and (AC)ik were regarded as random effects and all others as fixed effects. The following mean squares (MS) were 640 U. Nilsson, G. Örlander (Fig. 1). See...

Ngày tải lên: 08/08/2014, 01:21

... plicata D. Don) and its relation to position in the log, Forestry 15 (1941) 65–75. [8] Chang S.T., Wang S., Cheng S.S., Environmental effects on the colour of Sugi (Cryptomeria japonica D. Don) heartwood, ... heartwoods and its effects on decay resistance, Holzforschung 19 (1965) 190–195. [39] Rudman P., Da Costa E.W.B., Variation in extractives content and decay resistance in t...

Ngày tải lên: 08/08/2014, 01:21

... bifurcation to the cross-sectional area before bifurcation, α , and the distribution of the cross-sectional areas after bifur- cation, q [21, 25]. Independency of ratios α and q on root diameters has ... Finland (Research Grant 28203). REFERENCES [1] Arredondo J.T., Johnson D.A., Root architecture and biomass allo- cation of three range grasses in response to nonuniform supply of nu...

Ngày tải lên: 08/08/2014, 01:21