Báo cáo lâm nghiệp: "Effects of defoliation on the frost hardiness and the concentrations of soluble sugars and cyclitols in the bark tissue of pedunculate oak (Quercus robur L )" potx

... 10.1051/forest:2004039 Original article Effects of defoliation on the frost hardiness and the concentrations of soluble sugars and cyclitols in the bark tissue of pedunculate oak (Quercus robur L. ) Frank M. ... the bark in the following winter via a reduc- tion in the content of soluble sugars and/ or cyclitols. To obtain p...

Ngày tải lên: 08/08/2014, 01:21

... extremes in the progress of time. Unlike them we dealt with dividing the runoff into components using the analysis of hydrograph by separation its recession limb and determining only the runoff con- stituents ... including drainage treatments, land-use management within the watershed and climate) (Š et al. 2004). The data collected during the investigation provi...

Ngày tải lên: 07/08/2014, 03:22

... basic condition of the rapid increase in the nitro- gen content in birch leaves was demonstrated by the analysis of its level in the dry matter of leaves during the spring season. e amount of ... pollution and increased inputs of nitrogen into plants. METHODS The experiment was established in April 2006 by planting one-year birch plants (Betula pendula Rot...

Ngày tải lên: 07/08/2014, 10:21

... another factor indicat- ing man-conditioned acidification of the soil profile. According to the classification of buffer zones, the spruce monoculture occurs predominantly in the aluminium zone, ... for the division of soils according to the values of soil reaction into particular buffer zones, soil under the broadleaved stand falls to the exchangeable zone. It is lo...

Ngày tải lên: 07/08/2014, 10:21

... few months. These climatic conditions limit the activity of natural fungal inoculum of soils by reducing the optimal time for fungal spores germination and mycelial growth, thus minimising the ... stimulation of seedlings growth by the fungi could also be influenced by nursery practices like the fertilisation levels, the type of substrate, or the container size [9]. Wh...

Ngày tải lên: 08/08/2014, 00:22

... rainfall values in the spring season, there is no correlation between the growth of the rings and the rainfall in any other season or the annual total. Figure 6 shows the relationship between these ... underlined the importance of climatic conditions operating on the tree seedlings during the first year of planting on the land. Fernández et al. [13] indicat...

Ngày tải lên: 08/08/2014, 00:22

... time, one of the following treat- ments was applied to the most distal offspring shoot of each labelled parent shoot (Fig. 1): (t.1) clipping of the apex, including all folded leaves; (t.2) clipping ... (offspring shoots are black filled and parent shoots are grey filled): t.1: clipping of the apex, t.2: clipping of distal buds and leaves, t.3: clipping of distal leave...

Ngày tải lên: 08/08/2014, 00:22

... seedlings growing under FL and LS, only a small portion of the leaves actually initiated their growth after the start of the experiment. The significant differences in LAR found between light levels indicated ... (chlorophyll fluorescence emission) balances energy input with utilization at the leaf chloroplast level. The transition from photochemical quenching at low light...

Ngày tải lên: 08/08/2014, 00:22

... all treatments and replications included, so that the impact of competing cover on sapling size could be eval- uated independent of treatment. Then, equations were developed that included all ... immediately after plant- ing and at the end of each of the first 5 growing seasons. Bonanza Creek seedlings were also measured at the end of the sixth, ninth, and eleventh...

Ngày tải lên: 08/08/2014, 01:21

... besides the establishment of field vegetation, include the accumulation of litter, and compaction of the soil surface. Örlander and Nilsson [11] concluded that it is unclear how vegetation near the ... colonise the mineral soil. This study concentrates on the relationship between seed- ling damage and the establishment of vegetation cover close to the seedling....

Ngày tải lên: 08/08/2014, 01:21