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W. M. Pulliam 《Oecologia》1992,91(1):126-128
Summary Methane emissions were observed from knees of baldcypress (Taxodium distichum) in floodplain swamps of the Ogeechee river, a blackwater river in the lower coastal plain of Georgia, USA Emissions were sampled on 10 dates from March 1988 to September 1989, with small chambers placed over single knees. Methane emission rates from individual knees averaged 0.90 mg/d, corresponding to an average of 0.14 mg m–2 d–1 for the whole floodplain. In the habitat with the highest knee density (0.42 knees/m2), the average rate was 0.55 mg m–2 d–1. Spatial patterns in emissions from knees were similar to those of overall methane emissions from the swamp surface, though because of their low density were a minor contribution (0.42%) to total methane emissions from this system. 相似文献
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Beth A. Middleton 《Plant Ecology》2009,202(2):257-274
Seed bank densities respond to factors across local to landscape scales, and therefore, knowledge of these responses may be
necessary in forecasting the effects of climate change on the regeneration of species. This study relates the seed bank densities
of species of Taxodium distichum swamps to local water regime and regional climate factors at five latitudes across the Mississippi River Alluvial Valley
from southern Illinois to Louisiana. In an outdoor nursery setting, the seed banks of twenty-five swamps were exposed to non-flooded
(freely drained) or flooded treatments, and the number and species of seeds germinating were recorded from each swamp during
one growing season. Based on ANOVA analysis, the majority of dominant species had a higher rate of germination in non-flooded
versus flooded treatments. Similarly, an NMS comparison, which considered the local water regime and regional climate of the
swamps, found that the species of seeds germinating, almost completely shifted under non-flooded versus flooded treatments.
For example, in wetter northern swamps, seeds of Taxodium distichum germinated in non-flooded conditions, but did not germinate from the same seed banks in flooded conditions. In wetter southern
swamps, seeds of Eleocharis cellulosa germinated in flooded conditions, but did not germinate in non-flooded conditions. The strong relationship of seed germination
and density relationships with local water regime and regional climate variables suggests that the forecasting of climate
change effects on swamps and other wetlands needs to consider a variety of interrelated variables to make adequate projections
of the regeneration responses of species to climate change. Because regeneration is an important aspect of species maintenance
and restoration, climate drying could influence the species distribution of these swamps in the future.
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