Graduate School of Biosphere Science, Hiroshima University 1-4-4 Kagamiyama, Higashi-Hiroshima 739-8528, Japan.
Mar Pollut Bull. 2011;63(5-12):237-42. doi: 10.1016/j.marpolbul.2011.02.028. Epub 2011 Mar 12.
Terrigenous loading into enclosed water bodies has been blamed for eutrophic conditions marked by massive algal growth and subsequent hypoxia due to decomposition of dead algal cells. This study aims to describe the eutrophication and hypoxia processes in a semi-enclosed water body lying near a big metropolis. Phosphorus mass balance in a small inlet, Ohko Inlet, located at the head of Hiroshima Bay, Japan, was quantified using a numerical model. Dissolved inorganic phosphorous inflow from Kaita Bay next to the inlet was five times higher than that from terrigenous load, which may cause an enhancement of primary production. Therefore, it was concluded that not only the reduction of material load from the land and the suppression of benthic flux are needed, but also reducing the inflow of high phosphorus and oxygen depleted water from Kaita Bay will form a collective alternative measure to remediate the environmental condition of the inlet.
陆源物质输入封闭水体被认为是富营养化的原因，其特征是藻类大量繁殖，随后由于死藻细胞的分解而导致缺氧。本研究旨在描述位于大都市附近的半封闭水体的富营养化和缺氧过程。利用数值模型对位于日本广岛湾顶部的小口湾小型入海口——大贺湾的磷物质平衡进行了量化。与入海口相邻的大贺湾的溶解无机磷流入量是陆源负荷的五倍，这可能导致初级生产力的提高。因此，可以得出结论，不仅需要减少来自陆地的物质负荷和抑制底栖通量，而且还需要减少来自大贺湾的高磷和贫氧水的流入，这将形成一种集体替代措施来改善入海口的环境状况。
