Populasi Mikroorganisme pada Lahan di Berbagai Ketebalan Abu Vulkanik dan Vegetasi Berbeda pada Andisol Terdampak Erupsi Sinabung

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Date
2020Author
Qadaryanty, Izma
Advisor(s)
Sembiring, Mariani Br
Hidayat, Benny
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Tanah Andisol yang tererupsi memiliki tingkat ketebalan abu, dimana setiap ketebalan memiliki aktivitas mikroorganisme dan status hara yang berbeda, serta salah satu hal yang mempengaruhi aktivitas mikroorganisme yaitu vegetasi. Penelitian ini bertujuan untuk mengamati pengaruh berbagai ketebalan abu vulkanik dan vegetasi berbeda terhadap populasi mikroorganisme pada Andisol terdampak erupsi gunung Sinabung di kecamatan Naman Teran Kabupaten Karo yang terkena dampak erupsi gunung Sinabung pasca 5 tahun terjadinya erupsi, yang dibedakan berdasarkan beberapa ketebalan abu yaitu : A0 : 0 cm (sudah diolah), A1 : <2 cm (tipis), A2 : 2-5 cm (sedang), A3 : >5 cm (tebal) dengan vegetasi tanaman tahunan dan vegetasi rumput. Pengambilan sampel tanah menggunakan Purposive sampling. Perhitungan total mikroorganisme tanah dilakukan dengan metode Total Plate Count. Hasil penelitian menunjukkan bahwa semakin tinggi pH, C-organik, Kelembapan dan Suhu maka populasi mikroorganisme semakin menurun, juga berbagai ketebalan abu dan vegetasi yang berbeda berpengaruh terhadap jumlah populasi mikroorganisme. Semakin tebal abu vulkanik yang menutupi permukaan tanah maka total populasi semakin menurun yaitu sebesar 1,46 %. Andisol soils erupts has several thickness level of ash, where each thickness has a different microorganism activity and nutrient status, one of the things that affects the activity of microoganisms is vegetation. The aim of this research is to observe the impact of various thicknesses of volcanic ash and different vegetation on microorganism populations in Andisol affected by the eruption of Mountain Sinabung in Naman Teran Sub-District, Karo District, which was affected by the eruption of Mountain Sinabung after 5 years erupted, which is distinguished by several ash thicknesses, namely: A0: 0 cm (already processed), A1:<2 cm (thin), A2:2-5 cm (moderate), A3:>5 cm (thick) with annual plant vegetation and grass. Soil sampling was using the Purposive Sampling. Calculation of total soil microorganisms was done by the Total Plate Count method. The results indicated that the higher the pH C-organic, humidity and temperature, the lower populated of microorganism. Also different thicknesses of ash and vegetation affected the number of microorganism population. The thicker the volcanic ash covered the surface of soil, the lower populated of microorganism which was 1,46%.
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