KESUBURAN PERAIRAN WADUK NAGEDANG DITINJAU DARI KOSENTRASI KLOROFIL-a FITOPLANKTON DESA GIRI SAKO KECAMATAN LOGAS TANAH DARAT KABUPATEN KUANTAN SINGINGI PROVINSI RIAU
Abstract: This research was
conducted from Mei to June 2009 in the NagedangLakes Giri Sako Villages Logas
Tanah Darat Sub-District Kuantan SingingiDistrict, Riau Province. The objective
of this research was to predict waterproductivity as water fertilizing level from
phytoplankton chlorophyll – α. Surveymethods were used for analysis this
research were carried out by combining thephysic and chemical water parameters
and also biological parameter(phytoplankton organism) observations.The predict
results of this research that taken from 4 stations. It has beenfound average
of chlorophyll- α as secchi depth were 37,783 – 43,766 (μg/l); 3class of
phytoplankton such as Cyanophyta (15 species), Chlorophyta (11species), and
Bacillariophyta (7 species) with average of phytoplanktonpopulation value were
29.873 – 48.237 ind/l; average of physical waterparameters that consist of
depth : 235 – 792,3 m, thermo : 28,8 – 29 oC, secchi :74 – 80,3 cm, turbidy :
18,47 – 19,38 NTU, pH : 5,16 – 5,43: Oxygen : 5,26 –5,86 mg/l: carbon dioxide :
5,86 – 8,46 mg/l: Nitrate : 0,0606 – 0,0776 mg/l andphosphate : 0,0237 – 0,0253
mg/l. That value was mean that chlorophyll – α ofphytoplankton in Nagedang
Lakes were very productive caused chlorophyllconcentration more than 20 μg/l
and based on average of phytoplanktonpopulation shown that Nagedang Lakes were
eutrophic (very fertilize) withpopulation more than 104 ind/l. Phytoplankton
population had positive correlationwith chlorophyll concentration. The physical
and chemical water parameter stillgood for aquatic organism such as
phytoplankton and fishes.
Keywords: Water
Fertilizing, chlorophyll – α concentration, phytoplankton, manmade lakes
Penulis: Adnan Kasry, Eni
Sumiarsih, Heriyanto
Kode Jurnal: jpperikanandd090092