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+Lake
Diatas is one of the larger shallow natural lakes in Indonesia. It has a river
outlet through the River Gunanti. Although the drainage area is used for
extensive agriculture it has seemingly not yet affected the lake. It was weakly
stratified (RTR 16.3 and 27.0). The oxygen conditions are favorable. As the lake
is rather shallow, 44 meters, it may circulate down to the bottom periodically.
Total nitrogen values were from 0.076 to 0.927 mg/l N and total phosphorus
values from undetected to 0.040 mg/l P. The highest carbon dioxide concentration
in the hypolimnion was 5.30 mg/l, and iron concentration of 0.82 mg/l. The lake
is oligotrophic, having chlorophyll concentrations of 1.43-1.71 mg/m3,
biomass 0.05 mg/l and transparency of 5.5-6.5 meters. The dominant phytoplankton
species in March 1992 was similar to Cyanodictyon imperfectum, a
blue-green alga, in addition to green alga Oocystis spp., but in August
1993 Oocystis sp. dominated and the diatom Aulacoseira granulata
was well represented. The state is good non-point loading from agricultural land shall be controlled.
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