i ABSTRAK
Adi Firmansyah, 2012. Pengaruh Kemiringan Lereng pada Tegalan Terhadap Bahan Organik, Permeabilitas, Fraksi Debu dan Ketebalan Lapisan A di DTA Rawabogo Sub-DAS Ciwidey Kabupaten Bandung. Dibimbing oleh: Marenda Ishak Sonjaya Sule dan Daud Siliwangi Saribun.
Penelitian bertujuan untuk mengetahui pengaruh kemiringan lereng pada lahan tegalan terhadap Bahan Organik, Permeabilitas, Fraksi Debu dan Ketebalan Lapisan di Daerah Tangkapan Air (DTA) Rawabogo Sub-DAS Ciwidey Kabupaten Bandung. Penelitian ini menggunakan metode deskriptif komparatif pada kemiringan lereng yang berbeda dan dicek kebenarannya melalui pendekatan fisiografik (physiography approach) secara bebas berdasarkan penampakan fisiografis lahan. Pengamatan dan pengambilan contoh tanah dilakukan di lahan tegalan pada 3 kelas kemiringan lereng yaitu 8-15%, 15-25% dan 26-40% dengan replikasi 6 kali. Penelitian dilaksanakan dari bulan Juni sampai Juli 2012 di DTA Rawabogo Sub-DAS Ciwidey Kabupaten Bandung. Hasil penelitian menunjukkan bahwa kelas kemiringan lereng 8-15% memiliki pengaruh terbaik terhadap kandungan Bahan Organik, Permeabilitas, Fraksi Debu dan Ketebalan Lapisan A. Kemiringan lereng terhadap bahan organik (r = -0,834) dan ketebalan lapisan A (r = -0,841) memiliki pengaruh yang sangat kuat, kemiringan lereng dengan fraksi debu (r = -0,699) berpengaruh kuat dan kemiringan lereng dengan permeabilitas (r = -0,582) mempunyai pengaruh yang sedang.
ii ABSTRACT
Adi Firmansyah, 2012. The Effect of Slope on Dry Cultivated Land on Organic Materials, Permeability, Silt Fraction and A layer thickness in Rawabogo Catchment Area, Ciwidey Sub-watersheed, Regency of Bandung. Supervised by Marenda Ishak Sonjaya Sule and Daud Siliwangi Saribun.
This research was aimed to find out the effect of slope on dry cultivated land on Organic Materials, Permeability, Silt Fraction and A layer thickness in Rawabogo Catchment Area, Ciwidey Sub-watersheed, Regency of Bandung. This study used descriptive comparative method in different slope and had verified independently by physiographic approach based on land physiographic observation. Survey and soil sampling were conducted in dry cultivated land on 3 slope classes (8-15%, 15-25% and 26-40%) with 6 replications. The study was conducted from June to July 2012 in Rawabogo Catchment Area, Ciwidey Sub-watersheed, Regency of Bandung. This research resulted that the 8-15% slope class has the best influence on Organic Materials, Permeability, Silt Fraction and A layer thickness. The effect slope on organic materials (r = -0,834) and the thickness of A layer (r = -0,841) had a very strong relationship, slope with silt fraction (r = -0,699) correlated strongly and slopes with permeability (r= -0,582) has a moderate relationship.
