벼의 성장기간에 있어서 논의 육수학적 연구 = The Limnological Studies of the Rice Paddy Field During the Growing Season of Rice Plants

다국어 초록 (Multilingual Abstract)

The wok has been done as one of the basic study to develop the inland fishery of Korea at the rice paddy field in Suwon City. This limnological investigaion has been carried out for three months from June 26 to September 30 in 1968. The results obtained are as followings. The range of the water level was 3.5∼32cm, and the maximum water temperatures were showed at 6 : 00p.m., 4 : 00 p.m. 2 ; 00 p.m 12 : 00 a.m. in the late June, late July, late August, and in the late September. resectively, on the other hand, the minimum temperature was always at 4 : 00∼6 : 00 a.m. The maximum water temperature in June was at 6 : 00 p. m. and those of July, August, and September were 4 : 00 p.m. 2 : 00 p.m. and 12 : 00 a.m. respectively. The values of the dissolved oxygen were 6.6∼14.1 p.p.m., and the range of pH was 5.4∼6.2, total alkalinity was 12-39 p.pm., the average values of NH4, P205, and K20 were 1.62, 0.269, 4.83 p.p.m., respectively. Both the specific and individual numbers of the phytoplankters were relativily less, and Volvox globator was dominant species among them. The individual number of this species on July 3 was more than half number of total phytoplankters. The next abundant was Navicula spp., and followed Eudorina elegans, Pandorina morum in that order. The number of species and individual of the Zooplankters was rather larger than that of the phytoplankters. Eudiaptomus Japonicus, Diaphanosoma brachyurum Brachionus rubens and Arcella vulgaris were dominant species among them. And the total individual number of Rotifera was almost equal to the summation of those of Copepoda and Cladocera, especially, the number of Brachionus rubens was 91% of all Rotifera (7446). The individual number of benthos were only 799, and the summation of Dipteran larvae (Pentaneura and Chironomus) and Oligochaeta (Branchiura) were 94% of the total benthos. Aquatic plants and fillamentous green algae were collected and were belonging to 14 Families, 16 Genera, and 20 species. Spirogyra, Spirodela polyhiza, Salvina natans. Monochoria vaginalis, Caulina serristioula and Peritraria blone were abundant species especially, Spirogyra was the most abundant one among them. It was concluded that water level, water temperature, dissolved oxygen, pH nutrition salts, and food organisms were suitable for fishculture, but, Spirogyra should be controled from the rice paddy field as soon as possible.