IDENTIFIKASI KARBON ORGANIK TANAH DAN SUHU PERMUKAAN TERHADAP BEBERAPA CIRI FISIKA DAN KIMIA TANAH PADA BEBERAPA PENGGUNAAN LAHAN DI NAGARI PADANG LAWEH KABUPATEN SIJUNJUNG

Gunadi, Gunadi (2020) IDENTIFIKASI KARBON ORGANIK TANAH DAN SUHU PERMUKAAN TERHADAP BEBERAPA CIRI FISIKA DAN KIMIA TANAH PADA BEBERAPA PENGGUNAAN LAHAN DI NAGARI PADANG LAWEH KABUPATEN SIJUNJUNG. Masters thesis, Universitas Andalas.

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Abstract

Nagari Padang Laweh located in Koto VII District, Sijunjung Regency, West Sumatra has 1,569.92 ha of the total area which was dominated by mixed farming, rubber plantation, and rice fields types of land use. The purpose of this study was to identify soil organic carbon content and surface temperature on some physical and chemical characteristics of soil under several types of land uses in Nagari Padang Laweh, Koto VII District, Sijunjung Regency. The study was conducted using survei method consisting of 5 stages, namely preparation, pre-survey, main survey, soil analysis in the laboratory, and data processing. Soil sampling and land surface temperature were identified based on land unit (LU). Based on the land unit map, there are 14 land units. Soil samples were randomly taken from each LU. The parameters observed included soil surface temperature, soil physical and chemical properties. The physical and chemical properties of the soil tested consisted of BD, texture, pH, organic C, particulate organic C, total N, CEC, available-P, K-exch, Ca-exch, Mg-exch, and Na-exch. The results showed that the highest soil organic carbon (SOC) content (2.49%) was found under rubber plantation on Inceptisols with a slope of 8-15%, land surface temperature of 31° C, particulate organic carbon (POC) 1.75%, texture clay, pH 5.03, total N 0.04%, P-available 6.32 ppm, CEC 15.96 cmol/kg, and base saturation 49.76%. The lowest SOC content (1.71%) was also in rubber plantation on Ultisols with slopes >40%, land surface temperature 28° C, POC 0.30%, texture clay, pH 5.71, total N 0.03%, P-available 5.62 ppm, CEC 11.31 cmol/kg, base saturation 32.66%. Soil organic carbon content decreases with increasing slope. Keyword: Land uses, Padang Laweh, Soil organic carbon, Surface temperature

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