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The role of roots and mycorrhizas in C-sequestration under elevated CO2 (popface)
2002
Lukac, M. | Godbold, D.L. (University of Wales, Bangor (United Kingdom). SAFS)
The need to assess the role of terrestrial ecosystems in the global C cycle and the potential change of this role as the atmospheric concentration of CO2 increases attracted considerable scientific attention over the recent decade. In order to assess ecosystem responses as a whole and to evaluate the potential role of forests and tree communities as a carbon sinks, the below-ground response to increasing levels of CO2 must be addressed
Show more [+] Less [-]Response of subarctic tree seedlings to solar UV radiation
2002
Turunen, M. (University of Lapland, Rovaniemi (Finland). Arctic Centre) | Suttinen, M. L. | Derome, K. | Norokorpi, Y. | Lakkala, K.
The response of Betula pubescens Ehr., B. pendula Roth and two provenances of Pinus sylvestris L. to solar ultraviolet radiation were investigated in a UV exclusion field experiment during the 1997-1999 growing seasons in Finnish Lapland. The seed-grown seedlings were grown under UV-B exclusion and UV-B/UV-A exclusion as compared to control treatment and ambient plants. The only significant impacts of UV exclusion were found in P. sylvestris provenance Enontekio. Longer-term field studies are needed to detect the cumulative characteristics of the UV responses
Show more [+] Less [-]Discussion of the effects of N with and without acidified S on a sitka spruce ecosystem after 5 years treatment
2002
Sheppard, L.J. | (CEH Edinburgh Bush Estate, Edinburgh (United Kingdom)) | Crossley, A. | Ingleby, K. | Carfrae, J. | Harvey, F. | Kennedy, V.
Significant differences in the effects of N alone compared with NS Acid have been found with respect to eutrophication and acidification. N alone had no effect on the pleurocarpous mosses, whereas NS Acid caused their death within 2 years. Both treatments enhanced stem area increment and N alone also doubled fine root growth. By contrast NS Acid treatments increased litterfall in a a dose response fashion
Show more [+] Less [-]Sensitivity of adult beech and spruce trees of a mixed forest to chronic ozone exposure: findings from a free-air ozone fumigation experiment
2002
Nunn, A. J. (Technische Universitaet Munchen, Freising (Germany). Lehrstuhl fur Forstbotanik) | Reiter, I. M. | Heerdt, Ch. | Haberle, K. H. | Langerbartels, Ch. | Werner, H. | Sandermann, H. | Fabian, P. | Matyssek, R.
The study aims at assessing response patterns to chronic O3 exposure in adult forest trees, examining physiological and structural responses at the organ and whole-tree level for consistency by means of biochemical and ecophysiological analyses. Through comparison between the two O3 regimes, conclusions can be drawn about processes, which are at risk or already affected by ozone under the unchanged, prevailing stand conditions. Responses are related to the O3 influx into leaves as a measure of the physiologically effective O3 dose and cross-compared with the AOT 40 concept which is being validated on the two O3 fluxes and AOT40-related responses in biochemical, ecophysiological and structural tree parameters
Show more [+] Less [-]Assessment of ozone visible symptoms in the field - perspectives of quality control
2002
Bussotti, F. (University of Florence, Florence (Italy)) | Schaub, M. | Cozzi, A. | Krauchi, N. | Ferretti, M. | Novak, K. | Skelly, J. M.
Two field exercises for the assessment of foliar visible ozone symptoms were performed during the "2nd UN/ECE ICP-Forests Intercalibration Course on the Assessment of Ozone Injury on European tree Species" organised by the WSL in collaboration with the University of Florence, Linnaea ambiente, and the PSU. The exercises were conducted at the Lattecaldo OTC research facility in Southern Switzerland and on the Moggio Level II plot in Northern Italy from 22-24 August 2001. 48 participants represented 21 countries. There are given objectives and results and conclusions from both sites
Show more [+] Less [-][Leaching of glyphosate estimated from three field trials]
2002
Kjaer, J. | Ullum, M. | Lindhardt, B. | Olsen, P. | Joergensen, J.O.