Abstract
The composition of carbon (C), nitrogen (N) and C/N ratio in the sediment lake provided valuable information about the sources of organic matter and depositional basin. In a floodplain lake, sediment deposition is very dynamic related to seasonal changes. The aim of the study is to reveal the composition of C, N and C/N ratio in sediment lake in the permanent zone and non-permanent inundation zones and to predict the sources of organic matter in sediment lake. The study was conducted in March 2017 in Lake Tempe, South Sulawesi, Indonesia. Sediment samples were collected from six zones. C-organic was determined according to modification of the Walkley-Black method. Nitrogen was determined by the Kjeldahl method. The result showed that carbon organic in this sediment lake was about 4.7 – 5.8 %. The lowest was found in the nonpermanent zone. The highest value was found in the permanent zone, indicating that the organic carbon has been accumulated for long period in this permanent zone. Nitrogen organic content in sediment was about 0.30 to 0.50 %, this value was relatively low. It probably nitrogen content has been released to the water column or rapidly up-taken by microbes. C/N ratio in the sediment of Lake Tempe was in the range 13.1 to 18.1, this value indicated that organic matter originated from a mixture of plankton and macrophytes.
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