白濁する溜池のC.I.E.表色法による水色とプランクトン

概要

論文の詳細を見る
The water colors and the plankton in 16 ponds in the neighbourhood of Nijyo village, Nara Prefecture, have been studied in November of 1955. The water color measurement was made by YAMAZAKI and WATANABE's method (1955), to which the principle of "additive color mixture" by using MAXWELL's disc was applied. The dominant wavelength (λD), brightness (Y) and excitation purity (Pe) on the C.I.E. color language of each water color obtained by this method in 16 ponds are shown in Table 2. As the brightness (Y) is considered to be the value representing the degree of white muddiness in the ponds investigated, the correlation between the brightness (Y) and the plankton flora was mainly studied. From Tables 2,3 and 4 which show the number of species constituting the plankton, these white muddy ponds seem belong to argillotrophic phase in the oligotrophic type as designated by YOSHIMURA (1933) in his system of lake types. From Figure 2 it is clear that the existence of colloidal mineral matters made the composition of phytoplankton flora extremely simple. In the density of dispersed phase, when it becomes considerably high, that is to say, the brightness (Y) of water color exceeds 10 per cent, the production of phytoplankton seems to be especially restricted.
日本生態学会の論文
1956-10-31