夏季の過栄養内湾(洞海湾)における生化学的キャラクターから見た粒子状物質の起源と低次生産過程  [in Japanese] Marine Lower Trophic Processes and Origin of Particulate Organic Matter Inferred from the Biochemical Characteristics in Hypertrophic Bayment (Dokai-bay) at Summer  [in Japanese]

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Abstract

夏季の過栄養内湾(洞海湾)の物質循環過程に及ぼす低次生産過程の影響を明らかにするために,粒子状物質の生化学的特徴を調べた。調査は赤潮が発生している1995年8月と1996年8月にセディメントトラップを湾内の3箇所に設置して沈降粒子の捕集を行った。湾内における沈降粒子束は8.2~307gm^<-2>day^<-1>と瀬戸内海など他の海域で得られている値より全般的に高かった。また沈降粒子束は湾口(Stn.2,20.1~62.5gm^<-2>day<-1>より湾奥(Stn.6,41.8~307gm^<-2>day^<-1>の方が大きく,各定点とも水深3mより7mの方が大きい傾向が見られた。粒子状物質の親生物元素組成比を見ると,湾口から湾央の沈降粒子(1996年Stn.2,3mC:N:P=68:10:1,Stn.4,3mC:N:P=71:10:1)と懸濁粒子(1996年C:N:P=57:12:1)は近似していた。また,沈降粒子の有機態炭素フラックスに占める植物プランクトン由来有機態炭素フラックスやフィーカルペレット態有機態炭素フラックスの割合は湾口に行くに従い大きくなることが確認された。湾奥で得られた粒子状物質の親生物元素組成比を見ると,沈降粒子のC/N(11~21)が懸濁粒子のC/N(4.6)やレッドフィールド比(6.6)に比べ高いため,陸域由来の粒子状物質の影響を受けていると考えられた。これらの結果から,湾内における粒子状物質の出来や物質循環過程は空間的に大きく異なり,湾口から湾央にかけては低次生産過程が寄与しているが湾奥は陸域の影響を受けていることが示唆された。Chemical characteristics of participate organic matter were investigated to elucidate influences of marine lower trophic processes on material cycling in hypertrophic bayment (Dokai-Bay) in summer. Sinking particles were collected twice by setting up a sediment trap at three points in the bay in August of 1995 and 1996 when red tides occurred. Total settling mass flux varied from 8.2 to 307 gm^<-2> d^<-1>, which was greater than that in other inner bays. Apparent increase in total mass flux was observed both from the mouth (Stn. 2, 20.1~62.5 gm^<-2> d^<-1>) to the inner (Stn. 6, 41.8~307 gm^<-2> d^<-1>) part of the bay and from 3 to 7 meters depth. In the inner part and middle part of the bay, biophile elements and biochemical composition ratios of sinking particles (1996; Stn. 2, 3m C: N: P=68: 10: 1, Stn. 4, 3m C: N: P=71: 10: 1) were close to those of suspended particles (1996; C: N: P=57: 12: 1). It was found that the proportion of phytoplankton origin organic carbon flux and fecal carbon flux in total organic carbon flux increased with getting nearer to the mouth of the bay. Since C/N (11~20) of the sinking particles was higher than that of the suspended particles (4.6) and the Redfield ratio (6.6) in the inner part of the bay, it was thought that the origin of the particulate organic matter was the land. From these results, it was confirmed that material cycling and the origin of particulate organic matter in the bay differed in the locations; the origin in the inner part of the bay was the land and that in the mouth and middle part of the bay was produced by marine lower trophic processes.

Journal

  • Oceanography in Japan

    Oceanography in Japan 17(3), 179-191, 2008-05-05

    日本海洋学会

References:  24

Cited by:  1

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    Oceanography in Japan 20(1), 1-17, 2011-01-05

    IR References (29) Cited by (4)

Codes

  • NII Article ID (NAID)
    110006664800
  • NII NACSIS-CAT ID (NCID)
    AN10382760
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    09168362
  • NDL Article ID
    9503611
  • NDL Source Classification
    ZM44(科学技術--地球科学--海洋・陸水・火山)
  • NDL Call No.
    Z15-778
  • Data Source
    CJP  CJPref  NDL  NII-ELS  IR 
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