UNSRAT Repository

DISTRIBUSI SPASIO -TEMPORAL NITROGEN DI DAERAH TANGKAPAN AIR DANAU TONDANO PROVINSI SULAWESI UTARA

Wantasen, Sofia and Luntungan, Joudie N. DISTRIBUSI SPASIO -TEMPORAL NITROGEN DI DAERAH TANGKAPAN AIR DANAU TONDANO PROVINSI SULAWESI UTARA. Jurnal Bumi Lestari, 16 (1). pp. 16-22. ISSN 1411-9668

[img]
Preview
PDF
Download (4Mb) | Preview
    [img]
    Preview
    PDF
    Download (292Kb) | Preview
      [img]
      Preview
      PDF
      Download (427Kb) | Preview

        Abstract

        The spatio temporal distribution of nitrogen in catchment area of Lake Tondano was important to investigate because agricultural residue comes from the catchment potentially decreased water quality in Lake Tondano. The purpose of this study was to examine the distribution of nitrogen spatially and temporally in the catchment area of Lake Tondano. The study was conducted in the field and laboratory. Water quality sampling conducted by using composite sampling on the rivers, lake Tondano and outlet of irrigation channels. The data collected was the total nitrogen, nitrate, ammonia in 2001, 2008 and 2014. Data were analyzed using Graph Method and Spatial Analysis. The results showed that the distribution of total nitrogen that has a high concentration found in the outlet streams and irrigation canals outlet. High nitrate accumulates in the outlet of Lake Tondano. Nitrate concentration can be divided into 9 (nine) classes, namely concentration of 0.100 to 0.211 mg / l; 0.211 to 0.322 mg / l; 0.322 to 0.433 mg / l; 0.433 to 0.544 mg / l; From 0.544 to 0.655 mg / l; From 0.655 to 0.766 mg / l; 0.766 to 0.877 mg / l; 0.877 to 0.988 mg / l; and 0,988- 1,100 mg / l. Ammonia, spatially spread evenly on the surface of Lake Tondano. Ammonia concentration can be divided into 9 (nine) class is a class that has a concentration of 0.000 to 0.064 mg / l; From 0.064 to 0.129 mg / l; 0.129 to 0.193 mg / l; From 0.193 to 0.258 mg / l; 0.258 to 0.322 mg / l; 0.322 to 0.387 mg / l; From 0.387 to 0.451 mg / l; 0.451 to 0.516 mg / l; and from 0.516 to 0.580 mg / l. Concentrations of nitrate and ammonia fluctuated from year to year of observation. This was influenced by fertilization in rice fields. Keywords; Spatio temporal distribution, nitrogen, Catchment area of Lake Tondano Abstrak Daerah tangkapan air Danau Tondano menjadi penting untuk diteliti dalam aspek distribusi spasio temporal nitrogen karena residu limbah pertanian dari daerah ini berpotensi terhadap penurunan kualitas air di Danau Tondano. Tujuan penelitian ini adalah untuk mengkaji distribusi nitrogen secara spasial dan temporal di Daerah Tangkapan Air Danau Tondano. Penelitian dilakukan di lapang dan laboratorium. Pengambilan sampel kualitas air dilakukan dengan menggunakan metode composite sampling di Sungai, Danau Tondano dan outlet saluran irigasi. Data yang dikumpulkan adalah nitrogen total, nitrat, ammonia pada tahun 2001, 2008, dan 2014. Analisis data menggunakan Metode Grafik dan Analisis Spasial. Hasil penelitian menunjukkan bahwa distribusi nitrogen total yang memiliki konsentrasi tinggi terdapat di outlet sungai dan outlet saluran irigasi. Nitrat terakumulasi tinggi di outlet Danau Tondano. Konsentrasi Nitrat dapat dibedakan dalam 9 (Sembilan) kelas yaitu konsentrasi 0,100-0,211 mg/l ; 0,211-0,322 mg/l ; 0,322-0,433 mg/l ; 0,433-0,544 mg/l ; 0,544-0,655 mg/l ; 0,655-0,766 mg/l ; 0,766-0,877 mg/l ; 0,877-0,988 mg/l ; dan 0,988- 1,100 mg/l. Ammonia, secara spasial tersebar merata di permukaan Danau Tondano. Konsentrasi Ammonia dapat dibedakan dalam 9 (sembilan) kelas yaitu kelas yang memiliki konsentrasi 0,000-0,064 mg/l ; 0,064-0,129 mg/l ; 0,129-0,193 mg/l ; 0,193-0,258 mg/l ; 0,258-0,322 mg/l ; 0,322-0,387 mg/l ; 0,387-0,451 mg/l ; 0,451-0,516 mg/l ; dan 0,516-0,580 mg/l. Secara temporal konsentrasi nitrat dan ammonia berfluktuasi dari tahun ke tahun pengamatan. Hal ini dipengaruhi oleh kegiatan pemupukan pada areal persawahan.

        Item Type: Article
        Subjects: S Agriculture > S Agriculture (General)
        Divisions: Fakultas Pertanian > Ilmu dan Teknologi Pangan
        Depositing User: Mr. Benhard W. Tampangela, ST
        Date Deposited: 09 Aug 2016 11:30
        Last Modified: 09 Aug 2016 16:56
        URI: http://repo.unsrat.ac.id/id/eprint/1216

        Actions (login required)

        View Item