Báo cáo lâm nghiệp: "The effect of nitrogen content on the of Scots pine needles and shoots photosynthesis" doc

... The effect of nitrogen content on the photosynthesis of Scots pine needles and shoots H. Smolander1P. Oker-Blom2 The Finnish Forest Research Institute, Suonenjoki ... 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 photosynthetic capacity of ... capacity of needles and by increasing light intercep-tion efficiency per unit area of needle sur-face on the shoot.ReferencesDeJong T.M. (1982) Leaf nitrogen content and C02...

Báo cáo lâm nghiệp:"Relationships between soil factors, Quercus robur health, Collybia fusipes root infection and Phytophthora presence" doc

... relationship between the crown health status of oaks and the C. fusipes root infection index, the depth of waterlogging signs (traces of iron deposition or depletion) and the depth of gravel layer ... number of fineroots per length of mother roots (t value of –1.35 and probabil-ity of 0.189) or the dry weight of fine roots per dry weight of mother roots (t value of 1.19 and probability of 0.854). ... R.D., Site variation of Armillaria mellea in three Ontarioconifers, in: Kile G.A. (Ed.), Proceedings of the 6th InternationalConference of Root and Butt Rot, International Union of ForestryResearch...

Báo cáo lâm nghiệp: "Moisture effect on carbon and nitrogen mineralization in topsoil of Changbai Mountain, Northeast China" pptx

... types on the northern slope of the Natural Reserve Zone of Changbai Mountain. The elevation influence on soil C and N mineralization was also discussed. The results indicated that for the given ... mineralization, but the effect on NH4+-N mineralization was not significant. The complex mechanism of their impact on the soil C and Nmineralization of Changbai Mountain remains to be studied further ... the regu-lation process of C mineralization is complex and might be co-regulated by other factors such as SOC and total N content of soils (G, G 2002). At the end of the incubation...

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

... 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-cropvegetation on soil temperature and light attenuation during the first five growing seasons. ... Performance of four seedling stock sizes 697further enhance the diameter. In plots with vegetation, bothheight and diameter differed among the stock sizes, and most of the size increments beyond the...

Báo cáo lâm nghiệp: "Ecological light measurement in forests using the light degradation effect in hydrogenated amorphous silicon(a-Si:H)" pot

... proportional to the thirdroot of illumination time t and to the square of the third root of incident light intensity I:Under certain preconditions the variations inphotoconductivity ... measurements rather than greataccuracy". Since the size of the sample test and the duration of the measuring periodhave considerable influence on the varia-tions in the measuring ... deposited on the other side of the samples. This could be car-ried out in the same deposition system usedfor the a-Si:H films.Another problem is that the absorption of the...

Báo cáo lâm nghiệp: " Sweet chestnut silviculture in an ecological extreme of its range in the west of Spain (Extremadura)" potx

... the focus of the biplot scalingwas on stands the relationships among stands arebased on euclidean distance interpretation,whereas among species and stands the relation-ships ... radiation on the ground asdetermined by the slope, the aspect and the lati-tude of the plot; Gandullo, 1974), (14) complexity of the sumoundings (indicating the degree of ... based on the sweetchestnut stands of the region of Extremadura(central-western Spain). This region con-stitutes one of the boundaries for sweetchestnut distribution in...

Báo cáo lâm nghiệp: "Sexual reproduction in Populus II. Information molecules of the pollen grain" pptx

... beextended to other species of the 5 sections of the genus Populus. Moreover, extraction and use of these specific glycoproteinsimplicated in pollen-pistil recognition couldbe ... exine(Figs. 1 and 2). The presence of a greatamount of osmiophilic components in the pollen coat is observed within the arcades of the exine (Fig. 2). These componentswere ... the primary pro-ducts of the S (self-incompatibility) gene.They are of protein and glycoprotein na-ture (Nasrallah and Nasrallah, 1986;Gaude and Dumas, 1987). On the...

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

... along-lasting effect. This paper brieflyreports the results of an investigation into the long-lastincl effects of ozone fumiga-tion upon photosynthesis of Norwayspruce. ... in contradiction with the data of large numbers of papers reporting thatozone fumigation causes decreased rates of assimilation (A). However, examples of ozone fumigation not ... dafter the cessation of fumigation), rates of pho-tosynthesis and transpiration were measured in the field using a portable ADC infrared gas ana-lyzer and Parkinson leaf...

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

... association with ozone aﬀecting the stands. e increase in ozone concentrations after the second intervention was evident on all plots – indicating the absence of connection with the individual ... seasons 1999–2006, was focussed on the identiﬁcation and analysis of the impact of proton load (H+) and ground level ozone (O3) on beech stands diﬀerentiated by the intensity of the ... especially in the 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...

Báo cáo lâm nghiệp: "Forest watershed runoff changes determined using the unit hydrograph method" pps

... restoration was considered as a consequence reﬂecting the devel-opment of regenerated forest stand. Under such conditions, the ﬂuctuation of runoﬀ can be related to the loss and restoration of ... curve depend on the particular duration of rainfall and amount of precipitation since both physical and terrain conditions of watershed are considered constant. erefore when the watershed changes ... trend in the calibration period; the only diﬀerence is the level of the values. 60-hour hydrographs showed the same response to precipitation compared to both the above-mentioned shorter ones....

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