Tingkat Kesuburan Perairan Danau Kelapa Gading di Kisaran Naga Kecamatan Kisaran Timur Kabupaten Asahan ProvinsiaSumatera Utara

Abstract

Chlorophyll-a is one of the parameters indicators of fertility levels in a body of water. Kelapa Gading Lake is an artificial lake located in Asahan used by surrounding communities for fishing activities as well as tourist attraction. This study aimed to determine the abundance of phytoplankton,analyze the concentration of chlorophyll-a and water fertility in the Kelapa Gading lake. The experiment was conducted in February - April 2016 in the waters of Kelapa Gading Lake in Kisaran Naga Kisaran Timur District Asahan Regency of North Sumatra province. The method used in determining the location is purposive sampling. The measured parameters namely chemical-physical factors such as temperature, pH, brightness, light intensity, DO, nitrate, phosphate, and chlorophyll-a. analysis of correlation used to see the relationship between the parameters of the water with the content of chlorophyll-a. Results of research conducted in Kelapa Gading Lake in KIsaran Naga Asahan gained as much as 19 genus of phytoplankton which consists of four classes of phytoplankton that is Bacillariophyceae, Chlorophyceae, Cyanophyceae, Coscinodiscophyceace. The average value of chlorophyll-a in the waters of Kelapa Gading Lake amounted to 0.630 mg / m3. Lake fertility rates value have been classified as oligotrophic that is 29.362.