Báo cáo lâm nghiệp: "Carbon and nitrogen allocation in trees" pot

... Autumnal changes in total nitrogen, salt-extractable pro- teins and amino acids in leaves and adjacent xylem and phloem) required for efficient nitrogen transport. In contrast, arginine, ... of amino compounds found in xylem, only the amides, asparagine and glutamine; the amino acids, glutamate, aspartate, arginine and proline; and the ure...

Ngày tải lên: 09/08/2014, 04:20

... only one study investigated mechanisms of N stor- age and remobilisation in cork oak during winter and following spring [1] and none considered together dynamics of C and N during these periods. ... the two. 3.4. Seasonal changes in content and partitioning of winter C and N in plants Winter C and N represent the amount of C and N assimilated during labeling time, part...

Ngày tải lên: 08/08/2014, 01:22

... photosynthesis and fine-root phosphorus concentration. The high level of fine-root phosphorus concen- tration in mycorrhizal seedlings indicates that phosphorus was being preferentially stored ... ) only a small increase in phosphorus content and concentration within the plant; 2) no change in photo- synthetic rate; and 3) an actual 12% decrease i...

Ngày tải lên: 09/08/2014, 04:20

... agricultural landscape with three villages within the distance of 1.5 km from the stand and two local minor roads within 0.5 km.  e spruce stand in Bílý Kříž is quite detached in a mountain- ous ... differences in nitrate nitrogen concentrations in bulk precipitations and in ammonium nitrogen concentrations both in bulk pre- cipitation and in throughfall between th...

Ngày tải lên: 07/08/2014, 10:21

... light saturation in each species was increased with increasing nitrogen content (Fig. 1). With increasing nitrogen levels, the dark respi- herbivores in leaves. In the present ... of nitrogen in each pot was 5.0, 1.5, 1.0 and 0.35 g. Sup- plying date and the percentage against the total amount was July 1 40%; July 24 20%; Aug. 20 20...

Ngày tải lên: 09/08/2014, 04:20

... 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 basi...

Ngày tải lên: 07/08/2014, 03:22

... at random at six points within each stand and combined to form three bulked samples. Sam- ples were taken using a metal ring (diameter 30 cm) and all plant ma- terial was removed from the ring. ... concentration and that adjusted for gravel content. Three soil pits were dug at random points in the sampling plots in each stand when tree biomass sampling was carried out. To de- termin...

Ngày tải lên: 07/08/2014, 16:20

... Western Switzerland. July was less extreme than June and August, except in Swe- den, Finland and Norway. On most of the continent, both min- imum and maximum air temperature were between 1 and 3 ◦ C above ... temperatures in June and August also reached values more than 4 ◦ C above nor- mal in a smaller region, mainly in the South-West, from East- ern Spain to Southern Germa...

Ngày tải lên: 07/08/2014, 16:20

... negative in uence on the pulping quality increas- ing chemical consumption in pulping and bleaching, decreas- ing pulp yield and pulp brightness, and increasing process costs [20]. For the pulp and ... by Wilkins [28] in E. grandis, although some other studies in Pinus radiata [4] and E. grandis [3] have found linear relationship of these two variables. In conclusion, the r...

Ngày tải lên: 07/08/2014, 16:21

... obtained in the samples in- dicates the advantage of these selected elite-trees in the de- velopment of breeding programs, and the usefulness of SSR and ISSR markers in breeding experiments and ... populations of marginal areas along the Mediterranean basin, contributing to the main- tenance and the enrichment of the rural populations. In short, a deeper knowledge and opti...

Ngày tải lên: 07/08/2014, 16:21