1993 1 2 10 80.3km 2 45km 3.66 m 3 4.5m + 0.3m 7.3 7.5 2 2 Fig. 1990 17 80 1 310 m 3 423 m 3 70 620 m 3 16 6 30
Isitobi et al. 1989 1990 3m 4.5 5.5m 3 1990 0.5 1 Notomastus sp. 4m 1983 6 4 7 11 5 2.5 1.0 4 7.5 3 5 1968 1991 1987 1990 Seike et al. 1990 1977a 1977b 1978 1986 1962 1977 1984 1990
10 1996 10 T-N, T-P, a Chl.-a 30 ph TOYO TD21R DO COD - T N TN-05 T P Chl.-a Mohr Knudsen 6 DO YSI 3800 20 50 25 0.5mm xx13 0.25m 0.8m 0.5m/s 10 1,000m 1.0m 10 1986 1996 Fig. Table 10 Figs. Table 1994 1996 Fig 1996 8 Figs
Figs.1-2-1 Tables 1-2-1 1-2-2 10 30.6 1996.8 1.7 1986.1 8 27.7 9 25.3 7 23.8 2 5.1 1 5.8 3 6.7 22 Fig. 1-2-3 4m 2 Figs Figs.1-2-1 Tables 1-2-1 1-2-2 10 19.5psu 1994.9 0.93psu 1991.4 10.1 1990.9 0.30 1993.10 Fig. 1-2-3 4 5m Figs Figs.1-2-1 Tables 1-2-1 1-2-2 DO 160 60.3 100 105 0 141 70 6 9 DO 8 9 0 Fig. 1-2-3 DO DO 4m DO 4m DO Figs St 3 St 1 St 2 2 DO DO DO 8 9 10 0 8 2 4m 1 3m 12 1 6 1 1 5m 6 10 1 2m Figs.1-2-1 Tables 1-2-1 1-2-2 10 10 8 04 7 77
9 8 30 8 01 2 7 75 7 67 Figs.1-2-1 Tables 1-2-1 1-2-2 10 0 30 7 40ppm 10 3.31ppm 3.48ppm 10 3 84ppm 3.93ppm Figs.1-2-1 Tables 1-2-1 1-2-2 10 T P 10 233ppb 44 8 51.6 9 59 2 89 0 Figs.1-2-1 Tables 1-2-1 1-2-2 T N 13 0 820ppb 10 376 9ppb 55 1ppb T N Figs.1-2-1 Tables 1-2-1 1-2-2 2 6 60 1ppb 16 4ppb 14 6ppb Figs.1-2-1 Tables 1-2-1 1-2-2 10 1986 1995 Cyclotella sp. Dictyoshaerium sp. Coelosphaerium sp. Aphanocapsa sp. Merismopedia sp. Microcystis incerta Microcystis incerta 10 1986 1995 10 Sinocalanus tenellus Copepoda nauplius Keratella cruaciformis 10 1994 8 38 5 48 20 30 4 9 9psu 19 5psu DO
7 10 1990 DO 8 9 100 4 5m
Table 1-2-1. Mean, maximum and minimum data of various environment factors for decade (Jan.,1986-Aug.,1996) at the central part in Lake Shinji Layer WT ( ) DO (%) Sa (psu) Chl.-a (ppb) COD (ppm) T-P (ppb) T-N (ppb Min 2.0 60 0.3 4 0.30 10 2 Surface Max 32.2 160 10.1 59 6.90 233 82 Mean 16.1 104 3.6 16 3.31 45 37 Min 1.7 0 0.9 3 0.80 13 1 Bottom Max 30.6 141 19.5 60 7.40 209 46 Mean 16.0 70 6.1 15 3.48 52 5 Note: WT: Water Temperatuer; DO: Dissolved Oxygen; Sa: Salinity; Chl.a: Chlorophyll-a; COD: Chemical Oxygen Demand; T-P: Total Phosphorus; T-N: Total Nitrogen; Tra: Transparency
Fig.1-1-1.AnaerialphotographshowingLakesShinjiandNakaumi
Table 1-2-1. Mean, maximum and minimum data of various environment factors for decade (Jan.,1986-Aug.,1996) at the central part in Lake Shinji Layer WT ( ) DO (%) Sa (psu) Chl.-a COD T-P (ppb) T-N (ppb) ph Tra (m) (ppb) (ppm) Min 2.0 60 0.3 4 0.30 10 24 6.92 0.7 Surface Max 32.2 160 10.1 59 6.90 233 820 9.81 2.4 Mean 16.1 104 3.6 16 3.31 45 377 8.04 1.3 Min 1.7 0 0.9 3 0.80 13 13 6.92 Bottom Max 30.6 141 19.5 60 7.40 209 464 9.46 Mean 16.0 70 6.1 15 3.48 52 55 7.77 Note: WT: Water Temperatuer; DO: Dissolved Oxygen; Sa: Salinity; Chl.a: Chlorophyll-a; COD: Chemical Oxygen Demand; T-P: Total Phosphorus; T-N: Total Nitrogen; Tra: Transparency
The east in Lake Shinji Species composition of phytoplankton (%) 0 20 40 60 80 100 The center in River Ohashi The east in River Ohashi The center in Lake Nakaumi Yonago Bay Sakai Channel Flagellata Cyanophyta Chlorophyta Bacillariophyceae Fig. 1-2-6. Species composition of phytoplankton at sites between Lake Shinji and Sakai Channel. This graph was quoted from Date, 1990.