The Types and The Amounts of Organic Matter Influence Carbon Dioxide Production in The Reclaimed-Mine Tropical Soils

Abstract

The rate of carbon (C) mineralization plays an important role in environmental system as it determines the amount of carbon dioxide emit to the atmosphere and the amount of organic carbon stabilized by soil minerals. Therefore, assessing the influence of organic matter (OM) types on the C mineralization is essential to understanding mechanisms to reduce carbon dioxide production and to improve SOC contents in the reclaimed-mine tropical soils. In this study, four different types of OM (albizia, acacia, calopo and mixed-albizia-acacia-calopo) with 4 different rates: 0, 0.5, 1.0 and 1.5 of maximum capacity of soils to adsorb OM (Qmax) were added to a 3-years reclaimed-mine soil, and the C mineralization of added OM was quantified over a 90-day of incubation period. Results of the study revealed that the addition of albizia resulted in the C mineralization of 45.2% added OM, while the C mineralization of 58.1% added OM was observed when calopo was applied to the soil. Differences in the C mineralization with different types of OM was related to differences in the chemical composition of added OM. Addition of albizia at the rate of 0.5 Qmax produced the C mineralization of 38.7% added OM, while only 50.2% and 46.6% of added OM was mineralized when albizia was added to soils at rates of 1.0 and 1.5 Qmax, respectively. This study showed that the chemical composition of OM originated from vegetation may also be considered in the selection of vegetation types for mined-land reclamation in order to reduce carbon dioxide production and to increase the OC contents of the reclaimed-mine tropical soils.