Organic matter and organic carbon levels in sediments of Lake Maninjau, West Sumatra

Abstract

The organic matter content of lake sediments provides a variety of indicators, or proxies that can be used to reconstruct paleoenvironments of lakes and their watersheds. Particularly, in this study it will provide information that is important to interpretations of both natural and human-induced changes in lake ecosystems. The abundance of organic matter in sediments is described from the total organic carbon (TOC) because it’s a primary parameter. Moreover, Algae is the main source of organic carbon in the eutrophic lake. Lake Maninjau that located in West Sumatra has been eutrophic due to increasing of lake water utilization for floating fish cages, in recent years Lake Maninjau has faced an algal bloom frequently. Four sediments core were collected in Lake Maninjau from the lowest (near coastal) and deepest part (30 cm long core in average). Total organic matter (TOM) was performed using Lost on Ignition method (LoI) in whole cores, while total organic carbon (TOC) was analyzed using combustion analyzer method in one core that was taken in the deepest part of Lake Maninjau. TOM in Lake Maninjau among the cores varied between 21 to 34% at the surface, then decreased slowly as a depth. The percentage of surface TOM in the near coastal is elevated to the deepest part (21% to 34%). The TOC content in the surface was 9%. According to the Mid-Atlantic Integrated Assessment (MAIA) Estuaries the TOC concentrations in the sediments was in the range of high organic carbon level (>3%). The high value of TOC level in the surface sediment was controlled by algal productivity.

Spatial distribution of heavy metals and Ecological Risk Assessment for the main sub-branches (Rayahs) sediments of Nile River, Egypt

“…OM in sediments is the remains of organic life, fossils in the geological sense (Welte, 1696). Numerous indicators, or proxies, can be derived from the OM composition of sediments and used to reconstruct the paleoenvironments of water bodies and their watersheds (Dianto et al, 2020). Regarding the obtained results, the horizontal distribution of OM is shown in Table 3 and Fig.…”

Epiphytic microalgae community as aquatic bioindicator in Brantas River, East Java, Indonesia

“…This ammonia compound can come from the input of domestic, industrial and agricultural waste. According to Dianto et al (2020), the high TOM is caused by high human activities. Sources of total organic matter in the water can come from household and agricultural waste.…”

Organic Carbon (OC) and Organic Matter (OM) in Sediments Collected from Two Wetlands in Central Bida Basin, Nigeria

“…The OM content of lake sediments provides a variety of indicators or proxies that can be used to reconstruct paleoenvironments of lakes and their watersheds (Dianto et al, 2019). The abundance of OM in sediments is described from the Total Organic Carbon (TOC) because it's a primary parameter (Dianto et al, 2019).…”

“…The OM content of lake sediments provides a variety of indicators or proxies that can be used to reconstruct paleoenvironments of lakes and their watersheds (Dianto et al, 2019). The abundance of OM in sediments is described from the Total Organic Carbon (TOC) because it's a primary parameter (Dianto et al, 2019). The OM content of lake sediments provides information that is important to the interpretations of both natural and human induced changes in local and regional ecosystems (Meyers & Ishiwatari, 1995;Last & Smol, 2001).…”

“…The river Niger wetland at Jebba town have most of the major oxides in the sediments depleted due to intensive weathering and increasing the elemental compositions of the water (Omotoso et al, 2017). OM and OC are very useful for determining organic sources in sediments (Dianto et al, 2019) and are important parameters that can be used to evaluate biogeochemical activities in these wetlands.…”