CS06 Benthos
Date: Friday, June 14, 2002
Time: 11:00:00 AM
Location: Colwood
 
AsaedaT, Saitama University, Saitama, Japan, asaeda@post.saitama-u.ac.jp
Yutani, K, , Saitama University, Saitama, Japan, 
Sahara, N, , Saitama University, Saitama, Japan, 
Manatunge, J, , Saitama University, Saitama, Japan, 
 
SEASONAL STORAGE DYNAMICS OF PHRAGMITES AUSTRALIS RHIZOMES IN DIFFERENT AGE CATEGORIES
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The resource storage determines the stability and survival capacity of a reed stand. A wetland stand of Phragmites australis was investigated to analyze the seasonal storage dynamics of rhizome resources: biomass, total nonstructural carbohydrate (TNC), nitrogen and phosphorus, with respect to age categories and in combination with aboveground biomass. In spring growing season and late autumn, although biomass of rhizomes younger than 1 year continued to increase, resources of rhizomes older than 2 years were transported to form spring shoots and secondary shoots in autumn. The recovery due to translocation from shoots to rhizomes was faster and greater in younger rhizomes. A spring and autumn decline was evident in TNC concentration for all age categories. TNC standing stock of younger rhizomes decreased slightly during spring, however, it was lesser compared to older ones. These results imply that the older rhizomes remobilize stored resources more actively than the younger ones both for spring and autumn formation of new shoots, however, the younger ones are recharged at a higher rate than the older ones.