Ehime University Institutional Repository

河合, 眞澄

Japanese

歌舞伎の中の巡礼

Ehime University (愛媛大学)博士(工学)doctoral thesi

HIDAYAT

English

Finite Element Dynamics of Human Auditory System Comprising Middle Ear and Cochlea in Inner Ear

巻頭言「大学図書館における学生協働」 / 平尾智隆第7回大学図書館学生協働交流シンポジウムを開催しました!図書館で働く学生スタッフ学生にすすめるこの1冊河野晶苑文庫についてシリーズ学部資料室紹介(1):法文学部中央図書館からのお知らせ医学部分館からのお知らせ図書館日誌othe

愛媛大学図書館

愛媛大学図書館報「図書館だより」第103号

Ehime University (愛媛大学)博士(農学)thesi

Jidapa, Koomklang

（第３号様式）(Form No. 3) 
学  位  論  文  要  旨  
Dissertation Abstract 
 
 
氏名：  
Name 
Jidapa Koomklang 
 
学位論文題目：  
Title of Dissertation 
Studies on biophilic elements and nutrient regeneration  
in the coastal sediments（沿岸海域における堆積物中の生元
素と栄養塩溶出に関する研究）  
 
学位論文要旨：  
Dissertation Abstract 
 
 The quality of a coastal sediment is influenced by the organic matter loading 
from primary production in water column and from the land. Also, it is influenced by 
the aquaculture activity, where  aquaculture field is located. Particulate organic matters 
in the water column sink and accumulate on the surface sediments. Moreover, organic 
matter is released as inorganic form of nutrients from surface sediment to overlying 
water by biological organic matter decomposition in a biogeochemical process . 
Therefore, the study of  biochemical processes and nutrient  regeneration of the coastal 
sediments were interested.  
 This study was a research in the biogeochemical processes  of biophilic elements 
and nutrient regeneration in a shallow coastal sediments. The main objective is to 
understand the behavior of biophilic elements and their controlling cycles in a coastal 
environment. The surface sediments were collected from a semi -enclosed coastal 
environment  of Shido Bay, an active aquaculture area, the Seto Inland Sea. In this  
study, at first, the horizontal distribution of organic matter and heavy metal content in 
surface sediments were determined, and second, upward nutrient fluxes at 
sediment-water interface were investigated. 
 Horizontal distribution of total organic carbon (TOC), total nitrogen (TN), total 
phosphorus (TP), water content, grain size and heavy metals (Cd, Cu, Pb, Zn, Mn, As, 
Cr, Ni, Co, Al, Fe and Li) in surface sediment were determined at 29 sites in Shido Bay. 
In the horizontal distributions, TOC, TN and heavy metals (except Co and Mn) were 
higher in the inner part of the bay than in the mouth and they were significantly related 
to the mud content as finer sediment . On the other hand, high TP and Ca-bound 
phosphorus content were observed nearby fish cages due to the residue of fish feed, and 
also the increase of organic matter content from 2001 to 2012 was observed in the 
aquaculture area. These results suggested that the aquaculture activities in Shido Bay 
（第３号様式）(Form No. 3) 
affected the amount of organic matter in this area , and TP content was a good indicator 
of effect of fish farming. In Shido Bay, organic matter loading from the land and river 
was not noticeable, because an atomic C/N ratio on surface sediments (6.3–10.5) was 
similar to the C/N ratio in Redfield ratio (6.6) and was lower than that of terrestrial 
matter. Nevertheless, this area was not contaminated by heavy metals based on 
comparing sediment quality guidelines and the results found in other marine 
environments of the Seto Inland Sea. Also, the relative enrichment factor (E F value) 
used to evaluate heavy metal contamination had a value close to 1, which showed that 
the heavy metals in the surface sediment of this area was a background level of 
sediment and did not originate from aquaculture activity or other sources. The results of 
this study showed source of organic matter was mainly the primary production by 
phytoplankton in water column. This study also indicated that aquaculture activity 
influenced organic matter accumulation but did not influence heavy metal contaminatio n 
in the surface sediments, although the horizontal distribution of organic matter and 
heavy metals (except Co and Mn) were quite similar and were significantly related to 
mud content. 
 Surface sediments not only act as sink of organic matter, but also a source of 
nutrients (N, P and Si) regeneration from the sediment to overlying water particularly in 
shallow coastal system. Therefore, the role of the superficial layer (SL), which is the 
top 2-3 mm of the surface sediment, on nutrient regeneration was investigated by 
sediment core incubation method. The results showed that total fluxes were higher than 
SL-less fluxes. In addition, the effect of benthic fauna and bacteria activity on 
measuring nutrient upward fluxes were measured. In coastal environment, the upward 
nutrient flux was fundamentally regulated by temperature and high temperature period 
promoted high nutrient fluxes. Bacterial and microphytobenthos activities were  also 
important on nutrient regeneration on shallow coastal system, because the benth ic fauna 
on nutrient regeneration was negligible. Moreover, it was thought that bacterial activity 
was a major biological factor, because microphytobenthos (benthic diatom) was active 
during only winter period when sufficient light penetrated to the sea bo ttom.  


Studies on biophilic elements and nutrient regeneration in the coastal sediments

愛媛大学Ehime University博士(理学)thesi

田川, 和成

TAGAWA, Kazunari

π電子系オリゴマーの共役経路と電子構造に関する研究

愛媛大学Ehime University博士(理学)doctoral thesi

周, 佑黙

ZHOU, Youmo

High-pressure subsolidus and melting phase relations of Na-rich plagioclase : implications for the shock metamorphism of plagioclase in shocked meteorites

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自動運転車による事故と刑事責任 : 日本の刑法学の視点から

NAKASO, Hisao

United States v.Windsor,Same-Sex Marriage and Constitutional Law

富田, 英司

市本, 早香

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学童保育における学生主体の学習支援プロジェクト : 初年度の進捗報告

山口, 由等

名古屋都市圏の形成と都市社会の近代化

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