[A-OS21] [JJ] 陸域と海洋をつなぐ水循環の物理過程

[AOS21-P02] 地下水を経由したリン酸塩の海域への輸送がサンゴの生息環境に及ぼす影響

*安元 純¹、野崎 真司²、安元 剛³、廣瀬 美奈⁴、飯島 真理子³ (1.琉球大学　農学部　地域農業工学科、2.琉球大学大学院　農学研究科、3.北里大学　海洋生命科学部、4.一般社団法人　トロピカルテクノプラス)

キーワード：リン、31P核磁気共鳴装置、地下水、サンゴ

Phosphorus, the main ingredient of fertilizer, is a limiting factor for sustainable primary production and is recognized as a major source for eutrophication of lakes, estuaries, and watersheds. Phosphorus in the water environment exists in various forms, and its transport form have been remained in many regions. Many sequential extraction methods have been proposed for morphological fractionation of phosphate in soil, but there are problems such as not being usable for morphological classification of polyphosphate and organic phosphorus. However, in recent years, One-dimensional (1D) solution 31P nuclear magnetic resonance spectroscopy (NMR) is currently the tool of choice for molecular-level characterization of organic P in soils 31P nuclear magnetic resonance spectroscopy (31P-NMR) as a morphological separation method of phosphorus in soil in fields such as soil fertilizer has been conducted. In this method, it is possible to classify phosphate in a form which was difficult to classify by the continuous extraction method.
In the present study, 31P-NMR and Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES) are used to understand a characteristic of the transport form of phosphate in soil and groundwater. In addition, we estimated the phosphorus load through groundwater to the coral reefs sea region of Okinawa through field measurement and numerical simulations, and investigated the effect of phosphate on in vivo skeleton formation of primary polyp for hard coral Acropora digitifera.