Báo cáo lâm nghiệp: "The effect of excess nitrogen and of insect defoliation on the frost hardiness of bark tissue of adult oaks" pot

... moisture- elevation interaction on C 0 and C 0 k indicated that the environmental effect on C 0 and C 0 k was complex and deserves further study in the future. Soil N mineralization Most of the previous ... incubation experiment, this paper investigated the relationship between soil moisture and mineralization of C and N in soils with different vegetation types on...

Ngày tải lên: 07/08/2014, 10:21

... Evaluation of the average value of this indicator confirmed that the greatest diameter differentiation can be found in the spruce forest in the growth stage, which is understandable. On the other hand, ... distribution of the trees in the virgin forest, no tendency of their clustering in connection with altitude was found in the zones below 1,460 m. e influence o...

Ngày tải lên: 07/08/2014, 10:22

... competi- tion-crop relationships. The different soil temperature profiles during the establish- ment phase of non-crop vegetation on the two sites illustrates the different competition dynamics. The ... of release treatments. The objectives of this study were first, to quantify the net effect of non-crop vegetation on soil temperature and light attenuation during...

Ngày tải lên: 08/08/2014, 01:21

... stringent regulations on the separation of grazing of domestic ungulates and forest land in the second half of the 20th century saw a general decrease in grazing and the application of a close-to-nature ... 3). Since the decade of the 1960s there has been a new reduction of grazing intensity and in most of the trees established in the first decades of t...

Ngày tải lên: 07/08/2014, 16:20

... by the poor quality of leaves and the increasing accumulation of tannin as reported by F (1970) and also F et al. (2004). Because of a lack of information about the quality of food ... the year of study along A1 and host specificity along A2 were important in the summer feeder guild; and adaptation to lower quality of food along A1 and host specifi...

Ngày tải lên: 07/08/2014, 10:21

... This suggested that the small sample size and the use of only the outer part of the core reduced the power of the current study and therefore significance would generally be underestimated. All of the trees ... min- imising the costs or environmental impacts of the process. Kraft pulping generally involves the removal of most of the extractives, approxim...

Ngày tải lên: 07/08/2014, 16:20

... characteristics and productivity, on one hand, and taxon, on the other hand. The genus Populus is a member of the Salicaceae fam- ily and is subdivided into six taxonomically distinct sec- tions [18,21]. There ... result of the combined effects of irradiance and leaf aging, leaves at the base of the stems being the oldest ones and age decreasing from the b...

Ngày tải lên: 07/08/2014, 16:21

... bio- mass allocation to the stem, constant allocation to the foliage and lower allocation to the fine roots in comparison to high- or full-light [29, 49] conditions. As a consequence, the shoot-to- root ... herbaceous communities and multiple interactions with the overstory instead of simulated shade). The aim of this study was to test the following hypotheses: (i) beech...

Ngày tải lên: 08/08/2014, 00:21

... canadensis hybrids and in the absence of conspecific males. This is the only study reporting on introgression in the offspring of black poplar and the results are in contrast with other studies, were ... and the detection of regions in the genome that are less prone to introgression would allow a better understanding of introgression and subsequent consequences f...

Ngày tải lên: 08/08/2014, 00:22

... after DNA denaturation/renaturation and revealed important differences in number and position of bands between the two species. Number of secondary constrictions (SCs), of NORs and of nucleoli also ... pairs 5 and 12. DAPI banding displayed the highest number of signals (58) in karyotype of P. nigra. The number and position of mentioned specific bands are present...

Ngày tải lên: 08/08/2014, 00:22