Báo cáo lâm nghiệp: "Historical development of floodplain forests in the Upper Moravian Vale (Vrapač National Nature Reserve, Czech Republic)" pot

... data ob- tained in the areas of the Morava River floodplain in the area of Vrapač suggest that the development of the present ecosystems in the area in question began in the period of large-scale ... anthropogenic in uences that have over centu- ries led to the present state of the geobiocoenoses. Historical development of floodplain forests in...

Ngày tải lên: 07/08/2014, 10:21

... on the western side of the mountain range are actually typical species of the coastal plains which found their refuge in the rugged western foothills of Mt. Pangasugan. The dominant role of Shorea polysperma ... consists of 36 plots of 100 m 2 each located in the primary forest of the western foothills of Mt. Pangasugan, within the forest reserve of the...

Ngày tải lên: 08/08/2014, 00:22

... processes of their decomposition are inter- rupted in the clearings. In the course of clear-felling regeneration, the pH values of the upper soil horizon are slightly increased. In the preparation ... the subject of this paper, particularly comparing the effect of the natural regeneration of floodplain forests with clear-felling regeneration. Methods...

Ngày tải lên: 07/08/2014, 03:22

... test the interest of tree-ring analysis. METHODS We selected the Amance State Forest, about 1 000 ha, in the Lorraine plain, 15 km northeast of Nancy, in the northeast of ... and/or of ring translocations inside the tree would proba- bly conceal the effects on the ring mineral content of possible temporal decrease of their concentr...

Ngày tải lên: 08/08/2014, 18:21

... cell appears in the center of each ovule. Division of this cell initiates the spongy tissue. During the whole next year of development, few changes in the ovule occur; the spongy ... year of development does the free-nuclear stage of the female gametophyte appear in the center of the greatly enlarged spongy tissue. From now o...

Ngày tải lên: 09/08/2014, 04:20

... ith clone in the kth block in the lth year, µ is the overall mean, K ikl is the kriging estimate at the position of that tree in year l, B k and Y l are the effects of the kth block, and the lth ... analysis of variance using the SAS MIXED procedure [28]. Clone by site interaction was analyzed combining the leaf spot data of year 2005 in Sergude with the A...

Ngày tải lên: 07/08/2014, 16:20

... that the stress level is independent of the mechanical proper- ties of the material. It depends only on the load and on the sample geometry. In the following, the value of σ max determined using ... reduced the cooling rate during the cooling period. Concerning the sample deflection, three stages appear clearly on the second graph: – a period at increasing cree...

Ngày tải lên: 08/08/2014, 00:22

... simultaneously to fit the parameters of the constitutive model. In this possibility lies the main innovation of the inverse method pro- posed here. This feature is the key element of the identification ... i using the esti- mated set of parameters; N j is the number of discrete time for test j; M is the number of tests used to identify the parameters of t...

Ngày tải lên: 08/08/2014, 00:22

... growth in young Pinus radiata [28]. Therefore, thinning-induced root prolifer- ation would compensate for the initial decrease in root biomass, maintaining the contribution of root respiration during ... sparse. The plot was thinned during winter 1994/1995 and during winter 1998/1999 as shown by huge changes in leaf area index (Tab. I). Trees were about 30 year-old at the begi...

Ngày tải lên: 08/08/2014, 01:22

... amounts of nitrogen (N) increased a little initially in the fine roots of the Chinese fir during a short duration. In contrast, the fine roots of Tsoong’s tree were releasing N from the outset. The ... concentration, lignin content, ratio of lignin/N and ratio of lignin/P of the ini- tial material were the best predictors of mass loss for roots of the Chine...

Ngày tải lên: 08/08/2014, 01:22