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urn:nbn:nl:ui:32-419930 2026-03-31 urn:nbn:nl:ui:32-419930/mods Influence of drainage status on soil and water chemistry, litter decomposition and soil respiration in central Amazonian forests on sandy soils Berton Zanchi F. aut Waterloo M.J. aut Dolman A.J. 068735588 0000000110247275 aut Groenendijk M. aut Kruijt B. 072815027 0000-0002-6186-1731 000000039230912X aut text info:eu-repo/semantics/article 2011 10.4136/ambi-agua.170 en Central Amazonian rainforest landscape supports a mosaic of tall terra firme rainforest and ecotone campinarana, riparian and campina forests, reflecting topography-induced variations in soil, nutrient and drainage conditions. Spatial and temporal variations in litter decomposition, soil and groundwater chemistry and soil CO2 respiration were studied in forests on sandy soils, whereas drought sensitivity of poorly-drained valley soils was investigated in an artificial drainage experiment. Slightly changes in litter decomposition or water chemistry were observed as a consequence of artificial drainage. Riparian plots did experience higher litter decomposition rates than campina forest. In response to a permanent lowering of the groundwater level from 0.1 m to 0.3 m depth in the drainage plot, topsoil carbon and nitrogen contents decreased substantially. Soil CO2 respiration decreased from 3.7±0.6 µmol m-2 s-1 before drainage to 2.5±0.2 and 0.8±0.1 µmol m-2 s-1 eight and 11 months after drainage, respectively. Soil respiration in the control plot remained constant at 3.7±0.6 µmol m-2 s-1. The above suggests that more frequent droughts may affect topsoil carbon and nitrogen content and soil respiration rates in the riparian ecosystem, and may induce a transition to less diverse campinarana or short-statured campina forest that covers areas with strongly-leached sandy soil. Wageningen Environmental Research Alterra - Centre for Water and Climate CWC - Earth System Science and Climate Change Earth System Science Wageningen Environmental Research Alterra - Centrum Water en Klimaat CWK - Earth System Science and Climate Change Leerstoelgroep Aardsysteemkunde Revista Ambiente e Agua 6 1 6 29 1980993X urn:nbn:nl:ui:32-419930/obj 2026-03-31 http://purl.org/eprint/accessRights/OpenAccess