海草アマモの葉条部及び根茎部の栄養塩吸収・溶出機能

抄録

In recent years, the water quality of coastal area has been deteriorating by inflow of the nitrogen and phosphorus, which cause eutrophication problem. Moreover, the seaweed, which lives in the shore, decreases in number according to aggravation of transparency. In this research the uptake function of nitrogen and phosphorus by the leaf and root of Zostera marina was studied under various conditions of water temperature or illumination. The release of the nitrogen and phosphorus from dead Zostera marina was also examined. As a result, the uptake of nitrogen and phosphorus by the leaf and root of Zostera marina increased with the increase of water temperature, or the light intensity. Especially, the uptake rate of nutrients by the root was higher than that by the leaf. The NH4-N was uptaken preferentially rather than N03-N by the leaf, though the root uptake both NH4-N and N03-N in the same rate. Moreover, release of nitrogen and phosphorus increased with the increased of water temperature.