|Date: Friday, June 14, 2002|
|Time: 9:00:00 AM|
|Tanaka, N, , Saitama Univ., Saitama, Japan, n-tanaka@ post.saitama-u.ac.jp|
|Asaeda, T, , Saitama Univ., Saitama, Japan, asaeda @ post.saitama-u.ac.jp|
|Hasegawa, A, , Saitama Univ., Saitama, Japan, |
|COMPETITIVE GROWTH DYNAMIC ANALYSIS OF TYPHA ANGUSTIFOLIA AND TYPHA LATIFOLIA UNDER DIFFERENT WATER DEPTH AND NUTRIENT CONDITION|
|Dynamic growth models of monospecific and competitive stands of Typha latifolia and Typha angustifolia have been developed. Growth of five organs, shoots, rhizomes, new rhizomes, roots and panicles, was separately formulated for both species to account for the energy budgets due to photosynthetic production, respiration, mortality and transports between the organs, where different shoot elongation and vertical profiles of growth rate provided the competition between the species for light.
The model successfully simulated the seasonal variation of the aboveground and belowground biomass in a single species stands with a wide range of latitudes. For competitive stands, the variation of total biomass was also well simulated at three water depths. The analysis of competitive stands shows that the biomass and the total leaf area index are more effective than the shoot height. With sufficient concentration of nutrients, Typha angustifolia has higher superiority than Typha latifolia regardless of latitude, while, the superiority of Typha angustifolia decreases under the sterile condition. Long-term variation of their competitive superiority or inferiority with respect to water depth, nutrient condition and latitude was also simulated.