Báo cáo lâm nghiệp: " Environmental factors influencing streamwater composition on sandstone (Vosges Mountains)" pptx

... PRECIPITATION + 12.2 0.79 N-NH 4 + N-NO 3 –32.0 × PRECIPITATION + 91.7 0.88 Table II. Mean composition (%) of the sandstone layers. Senones Vosgian Conglomerate Intermediate sandstone sandstone sandstone SiO2 ... composed of Senones sandstone, Vosgian sandstone, Conglomerate and Interme- diate sandstone (Tab. II). The “Senones sandstone is a soft layer composed of successive band...

Ngày tải lên: 08/08/2014, 00:22

... important role in the explanation of species variance among guilds on closely related oak spe- cies. We can also conclude that explanatory factors in each seasonal guild are different, probably ... seasonal guild are different, probably as a result of species adaptation to seasonal condi- tions and/or resource specialization on the genus Quercus. Acknowledgements We would like to t...

Ngày tải lên: 07/08/2014, 10:21

... nutrition corresponding to different levels of physiological structures and functions. However, the function of nutrients is dependent on a number of factors connected with tree growth, ontogenesis, ... out that foliar concentrations of Mg, Ca, K, P, Mn, Pb and Zn were positively correlated with concentrations of corre- sponding soil elements. Principal component regres- sion analysis...

Ngày tải lên: 07/08/2014, 03:22

... application with a hypohatchet. e arboricide application was carried out in the second half of June 2007. e first inspection was realized one month after the arboricide application. Subsequently, ... formation (K 1968). Drawbacks of the arboricide application method consist in the potential for environmental con- tamination by toxic substances. At the same time, during the slo...

Ngày tải lên: 07/08/2014, 03:22

... vegetation; intensity, duration, extension and frequency of precipitation. e intensity of natural renewal of the cutting area surface on mountain slopes and its consequent condition significantly ... economic stimuli to environmental forest utilization on steep slopes have been introduced. e transport network plays an important role in the forest industry production of mountain re...

Ngày tải lên: 07/08/2014, 03:22

... traditional negative exponential diameter dis- tribution to one that includes a greater allocation of growing space for larger trees and longer cutting cycles. e primary sources of information ... area allocation as a guide in stocking control in multiaged, mixed-conifer forests in southern Finland. Forestry, 74: 171–185. PEARSON G.A., 1942. Improvement selection cutting in ponderosa pi...

Ngày tải lên: 07/08/2014, 04:20

... damage. DISCUSSION  e developed regression models can be considered as standalone complex models of environmental risk prediction allowing the “chance and potency” analysis using a traditional regression ... region Orava region  e Low Tatras region estimation Wald st. estimation Wald st. estimation Wald st. b i (b i /s(b i )) 2 b i (b i /s(b i )) 2 b i (b i /s(b i )) 2 Altitudinal vege...

Ngày tải lên: 07/08/2014, 10:21

... elevations and tolerates conditions in the ecotone of the up- per forest limit, although its optimal growth and production is reached in the conditions of the 5 th and 6 th forest vegetation zone. ... ratio of coniferous species on the one hand or with beech on the other hand are not exceptional. Higher portion of beech is related to shorter optimal stage; on the contrary higher...

Ngày tải lên: 07/08/2014, 10:21

... also belongs. An increase in im- mobilization may lead to yield depression under the conditions of low nitrogen supply, considering that under the conditions of high nitrogen supply, ammonium ... 1990; C et al. 1990): conversion of sam- ple nitrogen into the ammonium form by an oxida- tion-reduction reaction, further converting of NH 3 into N 2 by the reaction with alkaline hypo-brom...

Ngày tải lên: 07/08/2014, 10:21

... solutions are presented in Section Discussion. Promising is the utilisation of relative seasonal indexes (formula 2), which enable simple conversion of germination indicators observed at any one ... knowl- edge and opinions of most authors cited in the in- troduction. e correspondence is not only in the confirmation of the existence of seasonal periodicity of germination demonstrated by...

Ngày tải lên: 07/08/2014, 10:21