Báo cáo lâm nghiệp: "Human land-use, forest dynamics and tree growth at the treeline in the Western Italian Alps" ppt

... of the trees at the treeline was similar to the subalpine level, and the correlations between the two chronologies consequently increased significantly. 3.4. Growth trends in dominant trees The ... argues in favor of the fact that the tree establishment, and more in general the forest dynamic, has been mainly controlled by human land-use (Fig. 6) and tha...

Ngày tải lên: 07/08/2014, 16:20

... healthy and declining trees growing next to each other with stands from artifi cial regeneration showing mostly the decline of trees from a height of ca 3 m and trees from self-seeding declining ... from the oldest needle years and from the stem base to the treetop. In one stand, we could fi nd healthy and declining trees growing next to each other. Our analyses indicate...

Ngày tải lên: 07/08/2014, 10:21

... treatments, land-use management within the watershed and climate) (Š et al. 2004). The data collected during the investigation provide the following information. e investiga- tion span includes ... be related to the loss and restoration of both interception and transpiration. On the other hand, the drainage-induced change led to different runoff situation persisting t...

Ngày tải lên: 07/08/2014, 03:22

... vescalin and castalin, is mostly the result of an increase in roburin A-E, grandinin and vescalagin, whereas the castalagin content in- creases more slowly. Roburin A-E, grandinin and vescalagin contents ... vescalagin/castalagin ratio on the other hand. The significance of these correlations is that the increase of the total ellagitannin content, corresponding to an incr...

Ngày tải lên: 08/08/2014, 00:22

... proven that there are clear geographical patterns in several tree species and/ or loci [2, 9], indicating adap- tational mechanisms operating on these loci. In some cases these ... and the matrix of genetic distances was interpreted using the principal coordinate analysis [14]. The geographical coordinates (latitude, lon- gitude) of individual...

Ngày tải lên: 09/08/2014, 04:20

... high S0 2 inputs in the NE-Bavarian Mountains cause an imbalance in the nutrient supply of soils and plants, leading to cation leaching from damaged trees and subsequent ... al., 1988). These findings confirm Ulrich’s hypothe- sis (Ulrich, 1983) that cation leaching from a tree s canopy leads to an additional aci- dification of the rhizosph...

Ngày tải lên: 09/08/2014, 04:20

... than the artificial stands in other stand situations in the Krušné hory Mts. and exhibited equal growth parameters and vitality as the control plots in the Bohemian-Moravian Up- land in both ... technologies and procedures in soil preparation and reforestation. K (1982) pointed to profound and specific changes of bioclimatic processes following the elim...

Ngày tải lên: 07/08/2014, 03:22

... Scotch pine, silver birch and other tree species of different age and size. Within the forest cycle the Fig. 8. e natural layering of beech in the ecotone of the upper forest limit in the Krkonoše ... 543 of the stand and eventually also on the stand soil. Even the intact closure allows the rays of light to penetrate and create sun-illuminated spots wh...

Ngày tải lên: 07/08/2014, 10:21

... layer in all stands. Determined values of the C/N ratio in the beech stand are a little lower than the values that were measured in 1986–1987 in a comparable stand situated at close vicinity ... ratio in forest floor in different forest stands Fig. 8. Nitrogen stock in forest floor in different forest stands 0 5 10 15 20 25 30 35 40 Spruce forest stand Beech f...

Ngày tải lên: 07/08/2014, 10:21

Ngày tải lên: 07/08/2014, 16:20