Population ecology in a natural<Emphasis Type="Italic">syneilesis palmata</Emphasis> stand: II. vegetative growth and population structure |
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Authors: | Byeong Mee Min |
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Institution: | 1.Department of Science Education,Dankook University,Yongin,Korea |
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Abstract: | Vegetative growth and changes within populations ofSyneilesis palmata (THUNB>) MAX. Usannamul were monitored in two natural stands with different levels of incoming light. This perennial, shade-tolerant
herb was measured for its plant size, petiole length, leaf breadth, and leaflet number over 11 years in a moderately shaded
(MS) stand and over 7 years in a severely shaded (SS) stand. At the end of each growing season, a shoot primordium developed
at the center of the root system. Correlation coefficients were mostly high between pairings of two properties - total weight,
petiole length, petiole weight, leaf breadth, leaf blade weight, leaf area, specific leaf area, and leaflet number. Mean annual
mortality of this species was higher in SS (22.97%) than in MS (8.85%), but great fluctuations were seen from year by year.
Mortality was lowest for medium-sized plants. Regarding petiole length, differences in mean annual growth rates were conspicuous,
i.e., 2.6% in MS and 8.4% in SS, while growth rates for leaf breadth were 3.1% in MS and 24.2% in SS. Changes in plant frequency
within individual size classes roughly showed a normal distribution curve. However, the mode varied year by year, and such
changes were more remarkable in SS than in MS. Under severe shading,S. palmata had a higher growth rate and but also greater mortality than did plants under moderate shade. Therefore, one can conclude
that the population structure in SS was unstable over time. |
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