Assessment of impacts of management practices on GHG emissions from Singapore soils

München

2019

Sonderdruck

204853

Studies on soil greenhouse gas (GHG) fluxes from tropical grassland soils are limited compared to temperate
climates. While multiple studies evaluate GHG emissions from tropical forest soils, studies from grassland soils
are very rare. In this study, we measured soil greenhouse gas fluxes (CO2, CH4 and N2O) from two experimental
sites in Singapore over one year. The sites were located at Bishan-Ang Mo Kio Park (urban grassland) and
MacRitchie Reservoir Park (natural forest). GHG emissions from different management practices in urban
grassland were evaluated by comparing untreated grassland soil (T1), compost amended soil (T2) and soil with
N2-fixing plants as ground cover (T3). Furthermore, mineral N, microbial biomass C and N, TOC and TN content
of soil, litter and grass biomass were analyzed. Preliminary results indicated that untreated urban grassland and compost amended soils acted as sources for CO2, CH4 and N2O with T2 having the highest global warming potential. Parkland soils covered with N2-fixing plants acted as both source and sink for CH4 and N2O. Forest soils were also found to emit more N2O but less CO2 compared to urban grasslands soils. Furthermore, it was found to be a sink for CH4. Detailed results and GHG budgets will be presented.