Dampak Pengerukan Pasir terhadap Kelimpahan Plankton dengan Parameter Fisik Kimia di Hulu Sungai Belawan, Kecamatan Pancur Batu, Kabupaten Deli Serdang.

Abstract

River water environment consists of abiotic and biotic components that interact with each other. When interactions are both disrupted, there will be changes that led to the aquatic ecosystem becomes unbalanced. This research has been conducted in May to July 2013 in Belawan Headwaters River. This research used Purpossive Random Sampling method. There are 2 locations station, Station 1: Pertampilen village, District Pancur Batu as an active area of sand dredging activities, Station 2: Greetings Tani village, Batu district Pancur as areas that are not contained sand dredging activities. Sampling activities were conducted 4 times once/week. The research aim to know determined the abundance of plankton in Belawan Headwaters River. The results showed 20 species of phytoplankton and 1 species of zooplankton, there were consists of 11 classes: Bacillariophyceae (7 species), Coscinodiscophyceae (1 species), Conjugatophyceae (1 species), Zygnematophyceae (4 species), Chlorophyceae (5 species), Ulvophyceae (1 species), Trebouxiophyceae (1 species), Eurotatoria (1 species). The average abundance of plankton ranged from 4.11-5.19 ind / L. Diversity index ranged from 1.03-2.95 and dominance index ranged from 0.57-0.046. Water quality parameters, such as temperatur 24-26oC , phosphate 0.045-0.064,nitrate 0.924 - 1.314, nitrite 0.011-0.021, ammonia 0.318-0.491, turbidity 5.34-17.22. Based on abudance of phytoplankton, concluded that the activities that occur in the upper reaches of the Belawan affect the productivity of plankton in the river.