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| Titel |
Effect of habitat preference on frond life span in three Cyathea tree ferns |
| VerfasserIn |
Tzu Yun Chiu, Hsiang Hua Wang, Yao Lun Kuo, Tomonori Kume |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250073370
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| Zusammenfassung |
| Abstract
It has been reported that plants living in various geographical areas had different
physiological forms, as factors of microenvironment have strong impacts on physiological
characters. However, the physiological characters of fronds have been scarcely reported in
ferns. In this study, we investigated physiological differences in response to the habitat
preference in the three tree ferns in northeast Taiwan, Cyathea lepifera, C. spinulosa, and C.
podophylla, prefer to open site, edge of forest, and interior forest, respectively. The canopy
openness above the individuals of C. lepifera, C. spinulosa and C. podophylla were
29.2 ± 14.10 , 7.0 ± 3.07 and 5.0 ± 2.24 %, respectively. Among three species,
C. podophylla had the longest frond life span (13.0 ± 4.12 months) than the two
others (C. lepifera (6.8 ± 1.29 months) and C. spinulosa (7.3 ±1.35 months). Our
result supported the general patterns that shade intolerant species have a shorter
leaf life span than shade tolerant species. The maximum net CO2 assimilation of
C. lepifera, C. spinulosa and C. podophylla were 11.46 ± 1.34, 8.27 ± 0.69, and
6.34 ± 0.54 μmol CO2 m-2 s-1, respectively. As well, C. lepifera had the highest
photosynthetic light saturation point (LSP), while C. podophylla had the lowest
LSP among these three tree ferns. These suggested that C. lepifera could be more
efficient for capturing and utilizing light resources under the larger canopy openness
condition than the other two species. We also found that frond C : N ratio were
positively correlated with frond life span among species. C. podophylla, with the
longest frond life span, had the highest frond C : N ratio (22.17 ± 1.95), which
was followed by C. spinulosa (18.58 ± 1.37) and C. lepifera (18.68 ± 2.63) with
shorter frond life span. The results were consistent to the theory that the fronds and
leaves of shade intolerant species have high photosynthetic abilities with low C : N
ratio.
Key words: Canopy openness, frond life span, tree fern, Cyathea, frond C : N ratio |
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