Báo cáo lâm nghiệp: "Arbuscular mycorrhizal colonization of vascular plants from the Yungas forests, Argentin" docx

... DISCUSSION The mycorrhizal status of some herbs and shrubs of the NOA is reported for the first time. Bearing in mind that this study does not exclude the possibility of the occurrence of other kinds of ... conservation. The aim of this study was to characterize and describe the mycorrhizal status of native plants in the Yungas forests of Argentina. This...

Ngày tải lên: 07/08/2014, 16:21

... anxiously await the end of winter when the Supported by the Ministry of Agriculture of the Czech Republic, Project No. QH72075. Rodent-caused damage to forest trees from the viewpoint of forestry ... initiation of an extensive research focused on monitoring the population dynamics of rodents in forest environment, their feeding behaviour and the damage they cau...

Ngày tải lên: 07/08/2014, 03:22

... considerably affected the physical properties of raw rocks of the overburden forming the covering of the northern slope of the spoil bank. ese changes may be observed when analyzing the particle ... retention of water hardly available (HA) – the amount of water in the potential range of pF 3.2–3.7; – retention of water very hardly available (VHA) – the...

Ngày tải lên: 07/08/2014, 03:22

... the level of the mounds through the excavator-prepared areas through the areas of the spread mounds to the lowest level at the between- mound areas of the beech and spruce stands of the reserve. ... weed colonization adds to the supply of dead organic matter that constitutes the main source of food for earthworms. In the case of the “excavator-st...

Ngày tải lên: 07/08/2014, 10:21

... Biomass of ground vegetation The biomass of ground vegetation of the treeless pasture did not differ much from the two youngest larch forests (L0, L1; Fig. 2a). The ground vegetation in the three ... monocots was observed in the birch forests as in the larch plantations. The main difference between the two forest types was the dominance of dicots in the ground...

Ngày tải lên: 08/08/2014, 00:22

... weeks, the eggs hatch; the larvae immediately burrow through the bark and start feeding on the inner bark, the cambial layer and the outer sapwood, during the warm months of the year of ovipo- sition ... (0) of these features in the lower (L) or upper (U) parts of the trunk, respectively below and above the 10 m height level, using the arbitrarily chosen number...

Ngày tải lên: 08/08/2014, 01:22

... prepared. The expressed pop- ulation signal (EPS), a measure of correlation between the mean chronology derived from the sample of cores and the population from which they are ... examinations of the radial growth of pine trees (Pinus densiflora S et Z) on Mt Namsan and the potential effects of current level of air pollutants to t...

Ngày tải lên: 09/08/2014, 04:20

Ngày tải lên: 07/08/2014, 03:22

... mountain forests, in- cluding the area of the Beskidy Mts. (Beskid Śląski in the northern, Beskid Żywiecki in the southern part of the area described in this paper), located in the western edge of ... with the increase of the size of salvage cuttings (including the removal of in- fested trees) the area of stands affected by the forest decline increase...

Ngày tải lên: 07/08/2014, 03:22

... the total population of the bark beetle was calculated on base of the following mathematic relations. Presumptions of utilize mathematic relations is that one individual of parasitoid or predator ... studied the role of the para- sitism and intraspecific competition in the popula- tion dynamics of the bark beetle. C and L-  1994) on H. fraxini researched...

Ngày tải lên: 07/08/2014, 03:22