Báo cáo lâm nghiệp: "delayed effect of ozone fumigation on photosynthesis of Norway spruce" ppt
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 ... brieflyreports the results of an investigation intothe long-lastincl effects of ozone fumiga-tion upon photosynthesis of Norway spruce. Measurements were conducted inthe field ... ozone increased A inthe spring prior to budburst following asummer of ozone fumigation. Ozone decreases frost hardiness of Norway andSitka spruce (Barnes and Davison,...
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Báo cáo lâm nghiệp: "The effect of point application of fertilizers on the soil environment of spread line windrows in the Krušné hory Mts" docx
... se-quence of revitalization measures supported by the point application of fertilizers to forest plantations contributes to stabilization of the cycling of matter.CONCLUSIONIn the course of large-scale ... given site conditions without the effect of fertilization. Magnesium concentrations above 500–600 mgkg–1 may cause nutrition antagonism, especially in relation to uni-valent cations. Its ... organomineral zone of the root balls of plants, and the condition of the soil environment on spread windrows and changes in pedochemical properties as a result of applied fertilization were evaluated.ree...
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Báo cáo lâm nghiệp: "Moisture effect on carbon and nitrogen mineralization in topsoil of Changbai Mountain, Northeast China" pptx
... 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 C0 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 of a 42-day ... carbon (C) mineralization for their significant impact on the global carbon cycle and terrestrial ecosystem (IPCC 2007; J et al. 1991). Soil respiration is one of the largest carbon...
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Báo cáo lâm nghiệp: "The effect of liming on the mineral nutrition of the mountain Norway spruce (Picea abies L.) forest" docx
... 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 in the border ... 407–419.KULHAVÝ J., 2004. Ecological Consequences of Conversion. Chapter 6. In: SPIECKER H., HANSEN J., KLIMO E., Norway Spruce Conversion – Options and Consequences. Leiden – Boston – Koln, S. Brill Academic...
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Báo cáo lâm nghiệp: "Response to an ozone gradient of growth and enzymes implicated in tolerance to oxidative stress in Acer saccharum (Marsh.) seedlings" pot
... dur-ing the growing season in the absence of ozone. During ex-pansion and maturation of the leaves, N assimilation is mainlyunder 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: LefohnA.S. (Ed.), Surface level ozone exposures and their effects on vege-tation, ... increased activity of the ascorbate-glutathione detoxi-cation pathway and an increased concentration of antioxidantscontribute to the scavenging of toxic oxygen species derivedfrom ozone [14, 36,...
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Báo cáo lâm nghiệp:"Net effect of competing vegetation on selected environmental conditions and performance of four spruce seedling stock sizes after eight years in Québec (Canada)" ppsx
... detrimental effect of competing vegetation on seedlinggrowth is likely a partial result of its effect on light attenuationand hence on soil temperature. Light levels observed in plotswith competition ... production of various stock sizes, instead of grading seedlings within a given population; and second, toevaluate competing vegetation effects by means of competition– free seedlings, instead of ... objectives of this study were first, to quantify the net effect of non-cropvegetation on soil temperature and light attenuation during thefirst five growing seasons. Secondly, it was to quantify theeffect...
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Báo cáo lâm nghiệp: "The effect of excess nitrogen and of insect defoliation on the frost hardiness of bark tissue of adult oaks" pot
... decrease infrost hardiness of the bark of broad-leaveddeciduous trees with elevated leaf nitrogenconcentrations. However, the extent of thecontribution of excess nitrogen to ... betterunderstanding of the underlying physiolog-ical mechanisms.The findings of adverse effects of ampleN supply and of spring defoliation on frosthardiness of the bark still ... incubation,the conductivity of the solution was measured,and the tissue was killed by autoclaving at 120 °Cfor 20 min. After that, incubation and determina-tion of the conductivity...
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Báo cáo lâm nghiệp: "The effect of nitrogen content on the of Scots pine needles and shoots photosynthesis" doc
... & Rook D.A. (1984) Effects of mineralnutrition 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). Theaim of this study was to analyze separate-ly the effect of nitrogen content on thephotosynthetic ... The effect of nitrogen content on the photosynthesis of Scots pine needles and shootsH. Smolander1P. Oker-Blom2The Finnish Forest Research Institute, Suonenjoki Research...
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Báo cáo lâm nghiệp: "Changes in air quality in different phases of forest management process in a sub-mountain beech ecosystem (West Carpathian Mts.)" pdf
... 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 ... 3B). e mean ozone concentration (56 µg/m3) in 2005 was one and a half times higher than the value ob-Fig. 3. Variability and trends of ozone concentrations (µg/m3) (warm half of the year: ... extensive; consequently, the dif-ferences between the plots are not noticeable.e episodes of high ozone concentrations prima-rily depend on locally and regionally emitted ozone precursors, on meteorological...
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Báo cáo lâm nghiệp: "Available nitrogen in the surface mineral layer of Serbian forest soils" docx
... subtraction of the initial content of available mineral N (for the anaerobic incubation of NH4+-N content); Ninitial‒ 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 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 NH3 into N2 by the reaction with alkaline hypo-bromide...
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