δ13C and N Contents of Two Aquatic Plants, Spaganium fallax and Schenoplectus mucronatus, in a Subtropic Mountainous Lake
Resource
Taiwania, 55(1), 054-059
Journal
Taiwania
Journal Volume
55
Journal Issue
1
Pages
054-059
Date Issued
2010-03
Date
2010-03
Author(s)
Abstract
Spaganium fallax and Schoenoplectus mucronatus subsp. robustus are emergent monocot plants dominating a subtropical mountainous lake, the Yuanyang Lake (YYL), in Taiwan. The photosynthetic pathways and the ecophysiology of these two species were studied in this study. I first analyzed δ13C of fractions of S. fallax (submerged leaves and roots of seedlings, and submerged and emergent parts of leaves, and roots of mature plants) and S. mucronatus (emergent culms and roots of mature plants) to identify their photosynthetic pathway. I then investigated monthly variation in δ13C and nitrogen content of emergent parts of the two species during 2003 to evaluate the integrated photosynthetic response. The leaf carbon isotope ratio of both emergent plants was within the range of most C3 plants indicating that they used C3 photosynthetic pathway. Similar pattern of seasonal variation in leaf nitrogen content and δ13C values was found. Spring leaves (or culms in S. mucronatus) had significantly higher leaf nitrogen content and more positive δ13C values than summer leaves (or culms). Consequently, there are significantly positive correlations between δ13C and leaf nitrogen content in both species. The result suggests that changes in photosynthetic capacity might contribute to the seasonal variation in δ13C in both species. In comparison between two species, S. fallax had significantly more positive δ13C and higher leaf nitrogen content than S. mucronatus during most of the sampling months. The higher leaf nitrogen content found in S. fallax might also contribute to its more positive δ13C values than S. mucronatus.
Subjects
Yuanyang Lake Natural Preserve
Spaganium fallax
Schoenoplectus mucronatus subsp. robustus
nitrogen content
stable carbon isotope ratio
鴛鴦湖生態保護區
水毛花
東亞黑三稜
氮含量
穩定性碳同位素比值
Type
journal article
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