Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 20, Issue 3, 2018; Page No.(821-827)

THE DISTRIBUTIONS OF N, P NUTRIENTS AND ITS RELATIONS WITH CHLOROPHYLL- A: CASE STUDY IN SERANG AND WISO ESTUARY, JEPARA, INDONESIA

Lilik Maslukah, Sri Yulina Wulandari, Indra Budi Prasetyawan, Muslim

Abstract

The research was conducted in Jepara Waters to know the distribution of N, P nutrient and its relation to chlorophyll-a on two different estuary conditions. Upstream area of Wiso estuary, has a fairly dense population and Serang estuary has a large agricultural area. The watershed area (DAS) of Serang reaches 138.26 km2 and Wiso is only about 38.71 km2. N nutrient was determined as a nitrite ion using the sulphanilamide method after it was reduced using a reduction column (copper-cadmium). Soluble P nutrient was determined as orthophosphate using ascorbic acid method. Chlorophyll-a concentration was measured by the APHA method. The average of N and P nutrient concentrations were found to be higher in Wiso estuary than in Serang estuary. The difference of N, P values at two locations reached 0.1 and 0.08. N nutrient had a wider range of values than P nutrient. The ratio of N/P in the estuary of Serang and Wiso were sequentially 3.24 and 2.83. The high ratio of nutrients in Serang estuary illustrates the more abundant of N nutrient conditions. As a result, the concentration of chlorophyll-a became higher. In general, the patterns of nutrient and chlorophyll-a distribution at both sites show a high value in front of the mouth of the river at a location that has a depth of 2-3 meters and a salinity of 20-25%. The Wiso and Serang estuaries in Jepara waters are not included in the eutrophic category (<40 mg/m3).

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