Effect of organic matter level on methane emission in acid sulphate soil from belandean, South Kalimantan, Indonesia

摘要

Methane is considered one of the most important greenhouse gases. The studies of methane emission in acid sulphate soil was rarely being a subject of research. Belandean (South Kalimantan) which dominated with potential acid sulphate/sulfaquents group (Soil Survey Staff, 2010) was used to evaluate the level of methane emission. The soil from Balandean with various management of local organ ic matter has been used for a laboratory experiment. This experiment addressed to determine the amount of CH₄ emissions. This experiment used factorial design with two factors. The first factor was a type of organic matter, i.e. without organic matter (control), fresh rice straw, fresh c hinese water chestnut ( Eleocharis dulcis ) , fresh cattle manure, composted rice straw , composted c hinese water chestnut ( Eleocharis dulcis ), and c attle manure . The second factor was the land preparation i.e. no tillage and tillage pudling . The results showed that a pplicat ion of cattle manure was effective in reducing cumulative flux of methane emission either at no or tillage system . The cumulative methane emission was ranged from 1.9 to 14.46 μg CH₄.g^-1 day^-1 after 2 month s incubation at no tillage sy s tem . While at tillage system the cumulative methane emission was ranged between 0.89 to 19.87 μg CH₄.g^-1 day^-1. Correlation analysis showed that the methane emission from both land preparation system has positive ly correlat ed with organic-C, ferrous iron and negative correlation with soil redox potential and sulphate concentration.