Báo cáo lâm nghiệp: "Oak decline risk rating for the southeastern United States" ppt

... forests in the Appalachian and Ozark Mountains in the southeastern United States. These combi- nations of landforms and ownership class are dominated by mixed hardwood forests with ... oak decline damage in three of four models. In mountainous areas like those surveyed, these landforms are typically xeric ridge INTRODUCTION Oak decline in the...

Ngày tải lên: 08/08/2014, 18:21

... avail- ability in the variations of the calcium content of the trees. For this purpose, a new experiment was undertaken with the same acid soil and the same container culture ... estimated by the mineral analysis of twig bark (the tissue in which develops Pseudomonas syringae pv persicae, the infectious agent of the studied disease). Fo...

Ngày tải lên: 09/08/2014, 04:20

... obidvoch J. FOR. SCI., 53, 2007 (3): 93–100 97 lings from the forest nursery planted in the substrate from the declining forest stand, 6 – spruce seedlings from the nursery planted in the soil ... situated in the region of the Slovenské rudohorie Mts., the unit Volovské vrchy Mts. In the territory of the Forest Management Unit Spišská Nová Ves medium stable forest e...

Ngày tải lên: 07/08/2014, 03:22

... ranged from 500 to 1,000 mm for the years 1901–2005 but for the months of May–August they ranged only from 100to 500 mm. It is similar for air temperatures. For the years 1931–2005 average ... even for spruce. ey range from 0.402 to 0.517 for individual stands, and for the whole set of all spruce trees the value is 0.465. Coefficient of determination has the val...

Ngày tải lên: 07/08/2014, 10:21

... and M the number of QTLs shared by the two years, then the probability of having M intervals in common between the two years is given by the following ratio of combinations: . On average the distance ... A square root transformation was applied to nor- malize the data for the other measurements. Due to the difficulty to vegetatively propagate adult plant material, ability...

Ngày tải lên: 08/08/2014, 00:22

... that the shoot apex, the stem and the leaves displayed successively the largest sink strength during the flush. These authors therefore suggested, that the successive access to more nutrients for ... that the hydrolysis of sucrose by SuSy in phloem cells could either constitute a source of energy for loading/unloading of the sucrose [27] or for the provision of UDP-glu...

Ngày tải lên: 08/08/2014, 00:22

... (table I). The number of native species decreases from southern to northern latitudes (table I) consistent with the tropical origin of the species (Nixon, 1993). The genus ... photosynthetic mechanisms. These same photosynthetic mechanisms also may be independently influenced by water stress; therefore, it is very difficult to determine the exac...

Ngày tải lên: 08/08/2014, 18:21

... is presently not possible. The GC% values presented here are the first for the genus Quercus and the Faga- ceae family. The values are typical for higher plants. This type ... deviations. Unfortunately, there are no available microdensitometry or flow cytometry data on the DNA content in other Fagaceae gen- era (Castanea, Fagus, Nothofagus...

Ngày tải lên: 08/08/2014, 18:21

... deposits in the forests, due to the low activity of decomposing organisms in tropical forests inhibited by low temperatures and/or drought (K 1987). Furthermore, nutrient absorption in forest ... 4.06 3.21 Values in the parentheses are the relative percentage of nutrient contents of different components Table 2. Concentration of nutrients (% ± 1.s.e.) in the soil from the...

Ngày tải lên: 07/08/2014, 03:22

... inside the preserve designated for game in the whole territory of the Krušné hory Mts. In the framework of this project the existing network of for- est inventory in the CR was deepened and the ... National Forest Inventory as the primary information base was used both for repeated measurements and for more detailed investigations in the Fláje preserve. e conce...

Ngày tải lên: 07/08/2014, 03:22