KARAKTER LIMNOLOGIS PERAIRAN EMBUNG DI LOMBOK TENGAH NUSA TENGGARA BARAT, APRIL 2012

Abstract

Embung (shallow lake) has primary role in
supporting various activities in Nusa Tenggara Barat Province mainly in agriculture, live
stock and as reserved raw water. Wet season duration is shorter than dry season in this
province, therefore embung basically functioned as rain water reservoir in both wet season
and as reserved raw water in dry season. The aim of this research was to gain basic
limnological characteristics of embung specifically in Lombok Tengah Regency, Nusa
Tenggara Barat (NTB) Province. Samples were taken in April 2012 at six sampling
stasions at five embung embung, in 1) Batujai (reservoir), 2) Batujai (nearby floating fish
cage/KJA), 3) Dabak (Sengkol), 4) Pengkemit, 5) Cerigi, and 6) Pejanggi. Observed
parameter were N-nitrate, N-ammonia, N-nitrite, total nitrogen (TN), ortho-phosphate,
total Phosphorous (TP), chlorophyll-a, Total Organic Matter (TOM), water temperature,
pH, water conductivity, Total dissolved Solid (TDS), Dissolved Oxygen (DO), DO
saturation, turbidity, and Secchi depth. Results shows that embungs were prone to have
high aquatics productivity based on its nitrogenous and phosphorous contents as well as
chlorophyll-a. The concentrations of total organic matter and TDS were high while
turbidity in embung Pejanggi was very high. Abundance, number of species and diversity
indices of phytoplankton were low, while the abundance of zoobenthos was high.
Keywords: embung, limnological characteristics, Nusa Tenggara Barat