Báo cáo lâm nghiệp: "Influence of the form of nitrogen nutrition reductase activity in young black locus" doc

... (Aznadi, 1984). The present work examines the effects of the symbiotic and nitrate nitro- gen nutritions on the leaf nitrate reductase activity and the distribution of this enzyme activity ... greatly increas- ed by nitrate supplied via the roots. This inducible NR activity was consistently

Ngày tải lên: 09/08/2014, 04:20

... types of low altitude forests (e.g. Z 1973). In all of them Cg is one of the dominant species. In our study we concentrated on the study of the population of this species as also some other ... found in southern Moravian forests as exerted by the bank vole gnawing the stems of young trees. In controlled forests 40% of young oak plantings were dama...

Ngày tải lên: 07/08/2014, 03:22

... stands. In the present paper, the population dynamics of As is described in larger forest complexes of southern Moravia depending on the biotope and food supply including the response of the ... al. 2007). As to the dynamics of abundance during the six years of our study the years 2002, 2004 and 2007 seem to be similar. As the crop of seeds in the fore...

Ngày tải lên: 07/08/2014, 03:22

... thickness of the overlaying topsoil stratum, state of the mixing of CCB with topsoil including the water regime (slope, flatland) that con- tinues to change as a result of the building of other storeys ... re- sult of CCB application. e soil-forming process of the soil horizon in uenced by CCB ploughing -in is characterized at the age of 7 years by an invaria...

Ngày tải lên: 07/08/2014, 10:21

... broad- leaved tree species in the Mediterranean basin. In Spain, it occupies 2,039,563 ha and the main stands are found in the south and west (J et al. 1996). In southern Spain (Andalusia), with ... spread in the Mediterranean basin. In Spain, few studies on the genetic variability of this species have been displayed. Storage seed proteins are a useful tool...

Ngày tải lên: 07/08/2014, 10:22

... even lower in the case of spruce trees growing in well-drained sites. Interestingly, in either of the localities no correlation was deter- mined between the crown proportion index and the root ... trees growing in well-drained sites. Inter- estingly, on the other hand, in waterlogged sites, the mean value of R rp was 159 cm only, but it was 211 cm in trees gro...

Ngày tải lên: 07/08/2014, 10:22

... cone counts, 2 of them were plastic-bagged for 4 wk, starting at the beginning of treatments. The length of the terminal and 2 subterminal shoots were measured in the fall on ... applied in the 1981 internode; 4) girdling + one application of 100 mg GA4/7 in the 1983 internode; 5) same as treatment 4 applied in the 1981 inter...

Ngày tải lên: 09/08/2014, 04:20

... initial age provided sufficient information about the future trajectory of the basal area of the stand, regardless its thinning history. Therefore, the thinning effect is built into the model, in ... structure, the whole-stand model requires five stand-level inputs for simulation: the age of the stand at the beginning and the end of the projection interval, and th...

Ngày tải lên: 07/08/2014, 16:21

... thinning must include the thinning intensity, the stand age at the time of thinning and the time since thinning [17, 25, 39, 61]. In this work, to consider the thinning effect, the term proposed ... predictor of the tree heights Deterministic values of height can be obtained using the pre- vious model, while the prediction of the stochastic values invol- ves the...

Ngày tải lên: 08/08/2014, 00:22

... in cm; D max = maximum diameter of the stand, in cm; D 0 = dominant diameter of the stand, in cm; H 0 = dominant height of the stand, in m; H m = mean height of the stand, in m; t = age of ... to those of group 2, although the model of Tomé [40] gives the best performance of all the models tested, according to the values of the statistics used...

Ngày tải lên: 08/08/2014, 01:21