Abstract
Batur Lake is one of the natural lakes in the province of Bali where the activity of fishing, agriculture, tourism and housing available. This study aims to determine the effect of nitrate relation to the natural growth of the water hyacinth (Eichornia crassipes). Increased water hyacinth biomass in Songan station is the highest among the three other stations (Batur, Buahan, and Trunyan). At the end of the study (day 42 ), water hyacinth biomass of Songan station increased by 338.2 % from the initial weight, while at another station the increase weight ranges from 75 % -158 %. The highest daily growth rate in Trunyan station 3.68% / day, and the lowest in station Buahan which only reached 0.88% / day. At the Songan station where are many floating net which contribute to increase nitrate. There is a tendency of growth of water hyacinth faster at higher nitrate conditions. Nitrate conditions ranged from 0,35 to 0,62 m /l which shows that the waters of Batur Lake classified into waters that have a high fertility rate (eutrophic).
Highlights
Batur Lake is one of the natural lakes in the province of Bali where the activity of fishing, agriculture, tourism and housing available
This study aims to determine the effect of nitrate relation to the natural growth of the water hyacinth (Eichornia crassipes)
Ecological and socio ‐ economic impacts of invasive water hyacinth (Eichhornia crassipes): a review
Summary
Danau Batur merupakan salah satu danau alam yang ada di Provinsi Bali. Sama dengan danaudanau di Indonesia pada umumnya, Danau Batur juga mengalami penurunan kualitas air Radiarta dan Sagala (2012). Sistem KJA banyak menyumbangkan nutrien terutama unsur nitrogen, serta adanya aktivitas pariwisata, penggunaan bahan bakar untuk perahu motor yang kemungkinan mengalami kebocoran sehingga mencemari perairan danau dan masih banyak lainnya (León-Muñoz et al, 2013; Raini, 2009). Unsur nitrogen merupakan unsur hara (nutrien) yang diperlukan oleh tumbuhan air untuk pertumbuhan dan perkembangan hidupnya (Bornette and Puijalon, 2011). Tumbuhan air yang sering ditemukan diperairan danau akibat adanya kelebihan unsur N dan P adalah eceng gondok, karena eceng gondok mempunyai kemampuan berkembang biak dengan cepat dan mempunyai kemampuan menyerap unsur hara, senyawa organik dan unsur kimia lain dari air limbah dalam jumlah yang besar (Villamagna and Murphy, 2010). Tujuan penelitian ini adalah mengetahui pengaruh kandungan nitrat terhadap pertumbuhan biomassa basah eceng gondok dan perbandingan peningkatan pertumbuhan eceng gondok pada tiap-tiap lokasi (stasiun) yang mewakili daerah permukiman, perkebunan atau pertanian, perikanan dan pariwisata. Sehingga penelitian ini dapat dilakukan untuk mendukung pemanfaatan dan pengelolaan sumberdaya perairan di Danau Batur
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