| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2015: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Outline of Final Research Achievements |
This study shows the following three results.(1) The initial soil moisture content affects the amount of phosphorus released from soil to flooded water and the growth of phytoplankton in flooded water.
(2) The gas exchange between the air and the flooded water promoted by the water flow in the flooded water has a positive effect on the growth of algae.(3) Regeneration rate of inorganic phosphorus from green algae by filtration of snails was low, and the rate was about 0.2. Furthermore, the freshwater snail feeding behavior of algae on the soil surface promoted the regeneration of inorganic phosphorus, and the amount of phosphorus regeneration by the freshwater snail feeding behavior varied depending on the type of freshwater snail.
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