Permana, Ryan Candra (2017) Pengaruh Ketebalan Abu Vulkanik, Bahan Organik Dan Tanaman Paitan (Tithonia diversifolia), Terhadap Infiltrasi Tanah Terdampak Letusan Gunung Kelud. Sarjana thesis, Universitas Brawijaya.
Abstract
Bahan material vulkanik Gunung Kelud hasil letusan Februari 2014 berbutir kasar dan mengandung silika yang tinggi sehingga dapat menyebabkan pemadatan, dan menurunkan kapasitas infiltrasi. Pemanfaatan bahan organik dengan tanaman liar yang banyak terdapat di lokasi terdampak letusan dapat dimanfaatkan untuk memperbaiki penurunan infiltrasi. Penelitian dilakukan pada bulan Februari 2016 - Januari 2017 di Desa Pandansari, Kecamatan Ngantang, Malang. Plot percobaan dibuat dengan ukuran 0,5 cm x 0,5 cm, yang diisi dengan ketebalan lapisan material vulkanik yang berbeda (5, 10 dan 15 cm). Bahan organik (pupuk kandang dan daun ubi jalar) kemudian diaplikasikan dengan dosis setara 20 Mg Ha-1. Setelah 2 minggu inkubasi, Tithonia diversifolia ditanam. Pengukuran laju infiltrasi dilakukan setelah Tithonia diversifolia berumur 5 bulan, menggunakan single ring infiltrometer, dan dihitung dengan Metode Kostiakov. Pada saat yang sama, contoh tanah diambil untuk analisa sifat fisik (kapasitas menahan air, permeabilitas, berat isi dan ruang pori). Dari hasil penelitian menunjukkan bahwa adanya timbunan material vulkanik menurunkan laju infiltrasi tanah yaitu 0,58; 0,4; 0,38 cm min-1 pada masing masing ketebalan material vulkanik 5, 10 dan 15 cm. Aplikasi bahan organik dan Tithonia diversifolia meningkatkan laju infiltrasi tanah tertimbun material vulkanik dengan rata-rata kenaikan 0,07 cm min-1. Kombinasi bahan organik dan Tithonia diversifolia paling efektif pada ketebalan material vulkanik 15 cm, laju infiltrasi meningkat 0,12 – 0,2 cm min-1 dibandingkan dengan material tanpa perlakuan. Di antara sifat fisik yang diamati, persen ruang pori makro tanah tertimbun memiliki pengaruh paling besar terhadap laju infiltrasi.
English Abstract
Pyroclastic materials from the late eruption of Mt. Kelud (February 2014) are dominated by coarse particles and contain high content of silica, hence may result in soil compaction and reducing infiltration rate. Locally available organic matter and wild plants could be utilized to increase infiltration rate in the impacted area. An experimental research was then conducted in Pandansari, Ngantang, Malang. The experimental plots (0,5 cm x 0,5 cm sized), were filled with pyroclastic materilas with different thickness (5, 10 and 15 cm). Organic matter from different sources (cow dung and sweet potatoe leaves) were incorporated to the pyroclastic materials at the rate of 20 Mg Ha-1. Tithonia diversifolia planted after 2 week incubation with organic matter. Infiltration rate was measured 5 months later, using single ring infiltrometer, and calculated based on Kostiakov method. At the same time, materials were sampled for laboratory physical analysis. Water holding capacity, permeability, bulk density and porosity were measured. The results showed that the presence of pyroclastic materials lowered infiltration rate, i.e. 0,58; 0,4; 0,38 cm min-1 respectively in 5, 10 and 15 cm thick pyroclastic materials. Application of organic matter and Tithonia diversifolia increased infiltration rate at about 0,07 cm min-1. Combination of organic matter and Tithonia diversifolia was the most effective in 15 cm thick pyroclastic materials, as infiltration rate increased 0,12 – 0,2 cm min-1 compared to untreated materials. Among the physical properties studied, the percentage of macropores in the buried soil largelly affect infiltration rate.
| Item Type: | Thesis (Sarjana) |
|---|---|
| Identification Number: | SKR/FP/2017/846/051711063 |
| Subjects: | 600 Technology (Applied sciences) > 631 Specific techniques; apparatus, equipment materials > 631.4 Soil science |
| Divisions: | Fakultas Pertanian > Ilmu Tanah |
| Depositing User: | Yusuf Dwi N. |
| Date Deposited: | 15 Dec 2017 06:58 |
| Last Modified: | 06 Jan 2022 03:51 |
| URI: | http://repository.ub.ac.id/id/eprint/7107 |
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