Báo cáo lâm nghiệp: " Effects of tree species on understory vegetation and environmental conditions in temperate forests " pps

... of this study was to compare the impact of six tree species on vegetation and soil. Eighty stands growing side by side, and of different dominant species, were selected in 26 locations. Within ... studies have examined the impact of tree species on the composition of * Corresponding author: laugusto@bordeaux.inra.fr Effects of tree species on vegetati...

Ngày tải lên: 08/08/2014, 01:21

... resulted in the gradient of light environments that are characteristic of understory conditions in gap, moderate, and dense vegetation cover in mature oak forests. 2.2. Data collection Light ... have revealed a lack of understanding of ecological and physiolog- ical processes involved in oak regeneration. Light is a critical factor affecting early survival and gr...

Ngày tải lên: 08/08/2014, 00:22

... Lippu P. Puttonen Department of Silviculture, University of Helsinki, Unioninkatu 40 B, 00170 Helsinki, Finland Introduction Low soil temperature is one of the envi- ronmental factors ... errors in A, E and g. Effects of soil temperature on gas exchange and mor- phological structure of shoot and root in 1 yr old Scots pine (Pinus sylve...

Ngày tải lên: 09/08/2014, 04:20

... Effects of water deficit on leaf growth and initiation in fast-growing tree species J.C. Metcalfe W.J. Davies 1 J.S. Pereira 2 1 Institute of Environmental and Biological ... initiation is important and, as demon- strated in Fig. 3, the initiation of new leaves at the apex of the dominant shoot is restricted with developing water stre...

Ngày tải lên: 09/08/2014, 04:20

... yield indicators of indi- vidual tree species confirmed that under favourable soil conditions, maple and ash as moderately shade- tolerant admixed species are able to maintain their position in ... dominate in the lower and intermedi- ate layers, has a correlation index of R = 0.64, which is understandable concerning the behaviour of the virgin forest at this stage. Tr...

Ngày tải lên: 07/08/2014, 10:22

... damage of N. dombeyi branching systems In N. dombeyi trees, like in many other tree species, the branching system consisting of a parent shoot extended in one year and a cohort of offspring shoots ... branches at the beginning of their extension would exert only a minor effect on the size gradients of branches on a common parent shoot, in contrast with the results...

Ngày tải lên: 08/08/2014, 00:22

... old). In great fires recorded in SE Spain, a decrease in the effects of interspecific competi- tion by partial elimination of Cistus monspeliensis L. individ- uals increased survival and growth of ... potential [42] and competition effects on germination of therophytes described by Pausas et al. [32]. As a conclusion to this study, in spite of the intense modifi- c...

Ngày tải lên: 08/08/2014, 01:22

... the effects of phosphorus deficiency on carbon assimila- tion in forest tree species (Ericsson and In- gestad, 1988). In Australia, P fertilization of Pinus radiata increased ... discussed. MATERIALS AND METHODS Plant material and growth conditions Seeds of maritime pine (P pinaster) (INRA-CE- MAGREF) were germinated on natural peat for 1...

Ngày tải lên: 08/08/2014, 18:21

... reports on the direct effects of seedling density on growth in the absence of confounding effects of cell volume. Comparisons of seedling growth in different sized containers ... Specification of seedling size in terms of shoot height alone is not a good measure of seedling size since height growth of container seedlings grown at...

Ngày tải lên: 09/08/2014, 04:20

... of the stress application. Effects of saline stress on germination The application of saline stress led to a reduced germination rate. E. alba was the most sensitive species; ... of free amino acids, but its content in leaves was quite variable depending upon the proven- ance. Conclusion Saline stress reduced growth of plants and induced...

Ngày tải lên: 09/08/2014, 04:20