有明海奥部干潟域における脱窒菌群の生息分布と脱窒活性  [in Japanese] Habitat Distribution of Denitrifier and Denitrification Activity in the Tidal Flat of the Interior Parts of the Ariake Sea  [in Japanese]

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Abstract

有明海奥部干潟域における底質(深さ0~4cm)の脱窒菌数の場所的分布は,干潟の特性や季節によって大きく異なった.夏季の底質の脱窒菌数は,最奥部の泥質干潟で平均約18,000MPN/g-dryと多く,逆に東岸域や西岸域の砂質及び砂泥質干潟では平均約1,700MPN/g-dryと少なかった.また,底質の脱窒菌数と含泥率との間に高い相関性が見られ,脱窒菌数は含泥率の増加に伴って増大した.一方,泥質干潟における脱窒菌数の鉛直分布は,特に夏季にEhが0mV前後となる底質表層(深さ0~2cm)を中心に多かった.しかし,夏季以外の季節では、脱窒菌数は減少した.さらに,泥質干潟における脱窒速度は経時的に大きく変化した(0.35~13.86mg-N・m<SUP>-2</SUP>・d<SUP>-1</SUP>).また,泥質干潟の脱窒活性は,脱窒菌数の他に生息環境要素や基質濃度によって大きく左右されると推察された.

The spatial distributions of denitrifier numbers in the tidal sediment (0∼4cm depth) in the interior parts of the Ariake Sea changed largely with the properties of tidal flat and seasons. The denitrifier numbers in summer were many in the muddy tidal flat in the interior parts of this bay and about 18,000MPNs/g-dry on the average. But, its numbers were few in the sandy and mud-sandy tidal flats in the east and west coast areas and about 1,700MPN/g-dry on the average. A close relation between the denitrifier numbers in the tidal sediment (0∼4cm depth) and its mud (clay and silt) content was found and its numbers rose with the increase of mud content. The vertical distribution of denitrifier numbers in the muddy tidal flat was high near the surface layer (0∼2cm depth) where Eh was almost zero in summer, but its distribution decreased in other season. The denitrification rate in the muddy tidal flat changed largely with time (0.35-13.86mg-N·m<SUP>-2</SUP>·d<SUP>-1</SUP>). The denitrification activity in the muddy tidal flat was assumed to be affected by the environmental factors and substrate concentration other than the denitrifier numbers.

Journal

  • Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering

    Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 77(2), 121-128, 2009-04-25

    The Japanese Society of Irrigation, Drainage and Rural Engineering

References:  14

Cited by:  1

Codes

  • NII Article ID (NAID)
    10025641028
  • NII NACSIS-CAT ID (NCID)
    AA12240517
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    18822789
  • NDL Article ID
    10288774
  • NDL Source Classification
    ZR7(科学技術--農林水産--農産)
  • NDL Call No.
    Z18-365
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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