Electronic Theses and Dissertation

Erosi merupakan kehilangan tanah akibat pergerakan air dan angin. erosi terjadi dalam tigra proses, yaitu pelepasan, terbawa dan pengendapan. tujuan dari penelitian ini adalah untuk mengetahui besarnya erosi, menganalisis indeks bahaya erosi dan dampak kerusakan lingkungan yang terjadi di sub-das krueng seulimuem das krueng aceh. penelitian ini dilakukan melalui metode survei yaitu observasi langsung ke lokasi penelitian dan analisis tanah di laboratorium fisika dan kimia fakultas pertanian universitas syiah kuala. erosi ini dapat dihitung dengan menggunakan persamaan usle (universal soil loss equation). metode tersebut melihat beberapa parameter penelitian seperti faktor erosivitas, faktor erodibilitas, pengaruh panjang dan kemiringan lereng dan faktor pengelolaan tanaman dan tindakan konservasinya. penelitian ini dilakukan dalam tiga tahap, meliputi: (1) pengumpulan data sekunder dan penyusunan peta lokasi penelitian, (2) tinjauan lokasi penelitian dan (3) analisis tanah dan interpretasi data. hasil peta overlay jenis tanah, kemiringan lereng, dan tata guna lahan menunjukkan bahwa lokasi penelitian memiliki 9 (sembilan) satuan peta lahan (spl) dengan luas total 26.497,07 hektar. erosi aktual terbesar terdapat pada spl 8 yaitu 254,06 ton ha-1 th-1, sedangkan erosi potensial terbesar terdapat pada spl 9 yaitu 2.857,72 ton ha-1 th-1. terdapat tiga indeks bahaya erosi yaitu rendah masing-masing pada spl 1, 2, 4, 5, 6, 7 dan 9 ; indeks bahaya erosi sedang masing-masing terdapat pada 1, 2, 3 dan 6; indeks bahaya erosi sangat tinggi terdapat pada spl 2 dan 8. arahan konservasi tanah yang disarankan adalah reboisasi terhadap kawasan lindung pada spl 4 dan 8 dan kawasan budidaya dapat menerapkan kaedah-kaedah konservasi pada spl 1, 2, 3, 5, 6, 7 dan 9. kata kunci : erosi, sub das seulimeum, usle, indek bahaya erosi, konservasi

Erosion is the loss of soil due to water and wind movement. Release, carried away, and deposition are the three types of erosion. The objective of this study was to determine the magnitude of erosion and analyze the level of erosion hazard that occurred in the Krueng Seulimuem Sub-watershed and Krueng Aceh Watershed and the effects of the damage on the environment. The investigation was carried out through direct observations at the research site as well as the analysis of soil samples. The erosion was calculated using the USLE (Universal Soil Loss Equation). Several research parameters, such as erosivity factors, erodibility factors, the effects of slope length and slope steepness factors, plant management factors, and conservation measures were evaluated. It was conducted in three stages, including (1) secondary data collection and preparation of research site maps, (2) research site review, and (3) soil analysis and data interpretation. The results of the overlay map of soil type, slope, and land use indicated that there were nine of land mapping unit (LMU) in the research site with a total area of 26,497.07 hectares. The biggest actual erosion was at LMU 8, which was 254.06 tons ha-1 yr-1, while the biggest potential erosion was at LMU 9, which was 2,857.72 tons ha-1 yr-1. There were three levels of erosion hazard, including the low level was at LMU 1, 2, 4, 5, 6, 7 and 9; the moderate level was at 1, 2, 3, and 6, respectively; and the very high-level index was found in LMU 2 and 8. The recommended direction for soil conservation was the reforestation of protected areas at LMU 4 and 8, for cultivation areas that could apply conservation methods at LMU 1, 2, 3, 5, 6, 7 and 9. Keywords: Erosion, Seulimeum Sub-watershed, USLE, Erosion Hazard Index, Conservation