| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2000: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1999: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Research Abstract |
I improved a portable device for the outdoor measurement of microenvironments and ventilation of aquatic plants. Specific convective efficiency, which is defined as convective gas flow rate per unit surface area per potential pressure difference, and convective conductance were evaluated. At the same time, daily changes in dynamic pressure in a shoot (or leaf petiole) was monitored using a data-logging system comprising a number of small pressure transducers, an A/D converter and a laptop computer with a battery supply unit.
In a reed stand convective conductance of efflux shoots shows little daily change. Therefore, convective throughflow rate is easily estimated from the dynamic pressure and a constant of convective conductance. In a natural reed stand of Lake Inba-numa, convective gas flux reached 20 1 air m^<-2> h^<-1> at the noon on a summer sunny day. I and my colleague also evaluated the denitrification rate was as high as 1 g N_2 m^<-2> day^<-1>, measuring gas composition of influx and efflux shoots. This value is the highest among those reported.
In detached leaves of Nymphoides peltata and , N.indica, leaf water vapor diffusive conductance was highly correlated with convective, mass flow, conductance. This leads to develop a non-destructive measurement method of convective gas throughflow rate.
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