このエントリーをはてなブックマークに追加
ID 23479
file
Thumnail 39-0699.pdf 975 KB
title alternative
Phosphorus Cycle and Hydrographic Conditions of Harima-Nada in Summer
creator
Endo, Takuo
Imabayashi, Hiromichi
Matsuda, Osamu
NDC
Fishing industry. Fisheries
abstract
The principal phosphorus cycle and budget in summer of Harima-Nada, which was divided into three sub-waters on the base of hydorographic conditions, were investigated. Phosphorus flux associated with each pathway of the cycle was estimated and schematized (Fig. 5). In the nothern sub-waters, relatively high production of phytoplankton phosphorus was supposed to be caused mainly by phosphorus inflow through rivers, waste water and its release from the sediment. However, the higher phytoplankton production measured in the productive zone of whole region was not able to be maintained only by phosphorus input from land or sediment. Vertical stability of the water column in summer resulted in the serious phosphorus depletion by phytoplankton uptake in the surface water. Therefore, the standing stock of the nutrient was not sufficient in the productive zone, but high turnover rate of phosphorus, approximately one cycle per day as phytoplankton phosphorus, was estimated. Possible pathways of the nutrient supply which enable the high turnover are supposed to be through excretion from phytoplankton cells and by zooplankton. In the bottom water, high concentration of inorganic phosphate was observed where the mineralization of organic phosphorus and/or liberation of phosphate from the sediment prevailed. In those processes, the bioturbation by benthic animals presuinably plays an important role in the nutrient supply especially in the shallow waters.
journal title
Journal of the Faculty of Applied Biological Science, Hiroshima University
volume
Volume 26
issue
Issue 1・2
start page
79
end page
88
date of issued
1987-11
publisher
広島大学生物生産学部
農林水産研究情報センター
issn
0387-7647
ncid
SelfDOI
language
jpn
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
department
Graduate School of Biosphere Science
他の一覧