Effects of elevated CO2 and O3 on leaf litter phenolics and subsequent performance of litter-feeding soil macrofauna |
| |
| Authors: | Anne Kasurinen Petri A Peltonen Riitta Julkunen-Tiitto Elina Vapaavuori Visa Nuutinen Toini Holopainen Jarmo K Holopainen |
| |
| Institution: | (1) Department of Environmental Science, University of Kuopio, P.O. Box 1627, 70211 Kuopio, Finland;(2) Finnish Forest Research Institute, Suonenjoki Research Station, Juntintie 154, 77600 Suonenjoki, Finland;(3) Department of Biology, University of Joensuu, P.O. Box 111, 80101 Joensuu, Finland;(4) Plant Production Research, Soil and Plant Nutrition, Agrifood Research Finland, 31600 Jokioinen, Finland |
| |
| Abstract: | Two field-growing silver birch (Betula pendula Roth) clones (clone 4 and 80) were exposed to elevated CO2 and O3 for three growing seasons (1999–2001). The phenolic compounds of naturally abscised leaf litter were analyzed in order to
determine the possible CO2- and O3-induced changes in the litter quality. The potential litter-mediated CO2 and O3 effects on litter-feeding soil macrofauna (detritivore) performance were assessed in microcosm experiments, i.e., the relative
growth rates (RGR) of Lumbricus terrestris and Porcellio scaber, the relative consumption rates (RCR) of P. scaber, and mortality of the test animals were measured. The leaf litter grown under elevated CO2 had increased concentrations (weight per mass unit) and contents (weight per leaf) of phenolic acids, flavonol glycosides,
condensed tannins and total measured phenolics. Elevated O3 increased the concentrations of 3,4’-dihydroxypropiophenone 3-β-d-glucoside (DHPPG) and flavonoid aglycones but only under ambient CO2. However, elevated O3 effects on the content of some low-molecular-weight phenolic (LMWP) compounds (i.e. phenolic acids, DHPPG, flavonoid aglycones)
and total LMWP changed over time emphasizing the importance of conducting long-term (>3 years) exposure studies. In general,
RGR of young L. terrestris was affected by the litter quality changes induced by elevated CO2 and O3, as the animal growth rates were reduced when they were fed with CO2- and O3-exposed leaf litter of clone 80 in Experiment 1. P. scaber RCR or RGR responses to CO2- and O3-induced changes in litter quality were more variable and inconsistent, and neither were there any litter-mediated CO2 and O3 effects on animal mortality in these microcosm experiments. In conclusion, elevated CO2 has the potential to alter silver birch leaf litter quality, but the possible O3 effects on phenolic compounds and litter-mediated CO2 and O3 effects on detritivores are more difficult to validate. |
| |
| Keywords: | CO2 Detritivores Leaf litter O3 Phenolic compounds Silver birch |
| 本文献已被 SpringerLink 等数据库收录！ |
|
