Báo cáo lâm nghiệp: "delayed effect of ozone fumigation on photosynthesis of Norway spruce" ppt

... in contradiction with the data of large numbers of papers reporting that ozone fumigation causes decreased rates of assimilation (A). However, examples of ozone fumigation not ... briefly reports the results of an investigation into the long-lastinc l effects of ozone fumiga- tion upon photosynthesis of Norway spruce. Measurements were...

Ngày tải lên: 09/08/2014, 04:20

... se- quence of revitalization measures supported by the point application of fertilizers to forest plantations contributes to stabilization of the cycling of matter. CONCLUSION In the course of large-scale ... given site conditions without the effect of fertilization. Magnesium concentrations above 500–600 mgkg –1 may cause nutrition antagonism, especially in relation to u...

Ngày tải lên: 07/08/2014, 03:22

... the groups of soil organic matter of those 4 elevations (Table 1). e partial influence of elevation and as- sociated vegetation type and the effect of moisture- elevation interaction on C 0 and ... precipitation 1,075.53 mm). Stud- ies of soil carbon (C) and nitrogen (N) mineralization have attracted wide attention in the context of global climate change. Based on the data...

Ngày tải lên: 07/08/2014, 10:21

... monitoring of forest conditions after liming is required. ere exist a lot of data on the liming effect on the soil chemistry changes but data on the liming effect on the mineral nutrition of ... is limited by the poor condition of Czech forests. Despite the air pollution reduction during the 1990s, air pollution is still one of the causes of this condition. e forests...

Ngày tải lên: 07/08/2014, 10:21

... dur- ing the growing season in the absence of ozone. During ex- pansion and maturation of the leaves, N assimilation is mainly under the control of NR. After maturation, N assimilation de- creases and ... and ozone, Environ. Pollut. 18 (1979) 159–170. [8] Chappelka A.H., Chevone B.I., Tree responses to ozone, in: Lefohn A.S. (Ed.), Surface level ozone exposures and their effects o...

Ngày tải lên: 08/08/2014, 00:22

... detrimental effect of competing vegetation on seedling growth is likely a partial result of its effect on light attenuation and hence on soil temperature. Light levels observed in plots with competition ... production of various stock sizes, instead of grading seedlings within a given population; and second, to evaluate competing vegetation effects by means of competition...

Ngày tải lên: 08/08/2014, 01:21

... decrease in frost hardiness of the bark of broad-leaved deciduous trees with elevated leaf nitrogen concentrations. However, the extent of the contribution of excess nitrogen to ... better understanding of the underlying physiolog- ical mechanisms. The findings of adverse effects of ample N supply and of spring defoliation on frost hardiness...

Ngày tải lên: 08/08/2014, 18:21

... & Rook D.A. (1984) Effects of mineral nutrition on carbon dioxide exchange and parti- tioning of carbon in trees. In: Nutrition of Plan- tation Forests. (Bowen G.D. ... in studying photosynthesis of conif- erous trees (Linder and Rook, 1984). The aim of this study was to analyze separate- ly the effect of nitrogen content on the p...

Ngày tải lên: 09/08/2014, 04:20

... case of extreme ozone episodes. e obtained information on the air quality and on pollutants entering the environment provides a contribution for defining conditions for natural regeneration ... 3 B). e mean ozone concentration (56 µg/m 3 ) in 2005 was one and a half times higher than the value ob- Fig. 3. Variability and trends of ozone concentrations (µg/m 3 ) (warm half...

Ngày tải lên: 07/08/2014, 03:22

... subtraction of the initial content of available mineral N (for the anaerobic incubation of NH 4 + -N content); N initial ‒ initial content of available mineral N (for the anaerobic incubation of ... 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 s...

Ngày tải lên: 07/08/2014, 10:21