科研之友
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摘要
Premise of research. Sphagnum peatmosses strongly influence local and regional hydrology and biotic communities and based on high abundance at high latitudes also play a global environmental role in maintaining atmospheric chemistry and climate homeostasis. Previous field research suggests that elevated temperature linked to global climate change or elevated UV related to ozone depletion at high latitudes affects aspects of peatmoss productivity or external morphology hypothesized to influence environmental roles. However, changes in microscopic anatomy or potential temperature-UV interaction effects have not previously been investigated. Controlled environments offer advantages for assessing anatomical impacts of temperature and UV variation and detecting temperature-UV interactions. Methodology. Clonal cultures of experimentally tractable Sphagnum compactum were treated for a 2-mo period with environmentally relevant temperature levels (10 degrees, 20 degrees, and 30 degrees C) and two levels of UV-A + UV-B found in a pilot study to produce contrasting structural effects, in a factorial experimental design. Proportions of hydrolysis-resistant and cellulosic biomass and numerous features of microscopic anatomy having potential ecological significance were assessed and analyzed using two-way ANOVA. Pivotal results. Elevated temperature, the higher level of UV treatment, or temperature-UV interaction significantly influenced survival, biomass, cell wall biochemistry, or anatomical features of ecological significance. Plants grown at 10 degrees or 20 degrees C and under the higher level of UV treatment displayed increased proportion of hydrolysis-resistant cell wall material. Elevated temperature was associated with reduction in stem width and reduced numbers of supportive fibrils in branch and stem leaf hyaline cells. Plants exposed to 30 degrees C and the higher level of UV treatment died during the treatment period. Conclusions. Elevated temperature, UV, and temperature-UV interactions affect peatmoss biomass, wall chemistry, and anatomy in ways that could influence environmental roles. Functionally important traits affected by temperature or UV are recommended for assessment in field studies.
- 出版日期2015-2
