Báo cáo lâm nghiệp: "Litterfall and mineral return in two cork-oak forests in northeast spain" pot

... elements (N, K, Mg and espe- cially P), and high concentrations of Ca, Fe Original article Litterfall and mineral return in two cork-oak forests in northeast spain A Caritat 1 G ... 1996) Summary - Seasonal trends in littertall and potential mineral return were studied in two cork-oak forest sites in the northeastern Iberian peni...

Ngày tải lên: 08/08/2014, 18:21

... increased in 1995 in O and A and remained constant for the oth- ers. The highest Mn levels (fig 2d) were obtained in O and gradually decreased from A to C and D. In ... concerning the mineral contents. Results show different mineral levels according to the components tested. Thus, all minerals studied have the lowest concentrations in...

Ngày tải lên: 08/08/2014, 18:22

... Fv/Fm in beech seedlings growing in the open area, higher values in the gap and the highest values in seedlings growing under shelterwood, ex- plained these diff erences by increased photoinhibi- tion ... left in the shade and in control seedlings growing in the gap. Photoinhibition in beech seedlings grown in the shade and transferred to full light caused a re- duc...

Ngày tải lên: 07/08/2014, 10:21

... This could be de- termined by the analyzing the stands distribution in relation to environmental variables (Fig. 4) and within the first sam- pling time (Fig. 3a). Interestingly, the time effect ... (13.5 species in each sample, SW = 0.993) and the spruce site the lowest (only 11 species and SW = 0.904). Intermediate values were found in the oak, beech and Douglas-fir stands (12.6...

Ngày tải lên: 07/08/2014, 16:20

... System of Soil Classification for Making and Interpreting Soil Surveys. USDA Handbook 436, US Government Printing Office, Washington, DC, USA Stocking MA, Albaladejo J (1994) Refuse ... al, 1994), diminish bulk density by increasing porosity (Biswas and Koshla, 1971; Hall and Coker, 1983), and favour infiltration processes and water- holding capa...

Ngày tải lên: 08/08/2014, 18:21

... Sampling Fifteen leaves from the upper, inner and lower crowns were randomly taken from different trees at regular intervals (weekly and fortnightly in 1993; monthly in spring ... trees was effi- cient and a large and increasing propor- tion (42-55 %) of the applied [ 15 N]urea was incorporated into plant tissues. This increasing incorporatio...

Ngày tải lên: 09/08/2014, 04:20

... labeled methionine uptake indicated that the com- pound was rapidly taken up (within 30 min) and reached a plateau around 15 h in all shoot portions. Preliminary data concerning ethylene ... rooting process, probably in the stages of active cell division. In fact, increases in intracel- lular PUT and SPD levels preceded root protrusion and...

Ngày tải lên: 09/08/2014, 04:20

... N and K in the FH were higher than those in the CF and the two other Chinese fir plantations in Tianlin and Huitong, while those of P seems very similar [21, 39]. The CF and FH poten- tially returned ... in Ailao mountain (1.7 and 29 kg·ha –1 ) [9], an old-growth evergreen broadleaved forest in Dinghu mountain (5.9 and 42 kg·ha –1 ) [44], and a Castanopsis eyrei fore...

Ngày tải lên: 08/08/2014, 01:22

... 2005 (higher than in 2004, but including also lying, infested trees), but also – in the volume of infested standing trees, which was lower than in 2004. e real increase in the tree mortality ... distribution of stands in individual classes of the bark beetle caused tree mortality regarding their area in 2003–2006 sanitary cutting trend line sanitary cutting infested trees t...

Ngày tải lên: 07/08/2014, 03:22

... assessment of peeling and browsing intensity was carried out in two categories including individu- als with dbh from 7 cm to 11.9 cm and individuals with dbh from 12 cm to 20 cm. Individuals with ... preserve during repeated investigation in comparison with the rest of the investigated territory. In the course of five years, in relation to the original points and on the ba...

Ngày tải lên: 07/08/2014, 03:22