Characteristic of variations of C:N:P:Chl ratios of seston in eutrophic shallow Lake Kasumigaura.
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Ratios of particulate C, N and chlorophyll-a to particulate P, and ratios of particulate C to N and chlorophyll-a were examined at 10 sites of eutrophic shallow Lake Kasumigaura during 1980 to 1980. The ratios of C/P, N/P and Chl/P abruptly fluctuated at each station throughout the years. The ranges of these ratios were 13129 in C/P, 1.918.9 in N/P, and 0.22.4 in Chl/P. The average ratios increased from the inner part of bays to the central part of the lake. High Chl/P ratios were observed in the range of high N/P ratio and in the range from 40 to 150 μg·l<SUP>-1</SUP> of chlorophyll-a concentration. <BR>The average C/P, N/P and C/N ratios were 3969, 6.510.2 and 6.16.9 at each station, respectively. Only the C/P ratio indicated a moderate P deficiency as an average through the years, especially in the central part of the lake. The C/N ratio frequently exceeded the value of 7.7 in spring and summer seasons. This fact seemed to indicate the presence of a moderate N deficiency in these seasons in this lake.
- 日本陸水学会の論文
日本陸水学会 | 論文
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