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To better understand the effect of dissolved organic carbon (DOC)transported by hydrological processes (rainfall, throughfall, litterleachate, and surface soil water; 0–20 cm) on soil respiration in tropicalrainforests, we detected the DOC flux in rainfall, throughfall, litterleachate, and surface soil water (0–20 cm), compared the seasonality ofδ13CDOC in each hydrological process, andδ13C in leaves, litter, and surface soil, and analysed the throughfall, litter leachate, and surface soil water (0–20 cm) effect on soilrespiration in a tropical rainforest in Xishuangbanna, south-west China.Results showed that the surface soil intercepted 94.4 ± 1.2 % of theannual litter leachate DOC flux and is a sink for DOC. The throughfall andlitter leachate DOC fluxes amounted to 6.81 and 7.23 % of the netecosystem exchange respectively, indicating that the DOC flux throughhydrological processes is an important component of the carbon budget, andmay be an important link between hydrological processes and soil respirationin a tropical rainforest. Even the variability in soil respiration is moredependent on the hydrologically transported water than DOC fluxinsignificantly, soil temperature, and soil-water content (at 0–20 cm). Thedifference in δ13C between the soil, soil water (at 0–20 cm),throughfall, and litter leachate indicated that DOC is transformed in thesurface soil and decreased the sensitivity indices of soil respiration of DOCflux to water flux, which suggests that soil respiration is more sensitive tothe DOC flux in hydrological processes, especially the soil-water DOC flux,than to soil temperature or soil moisture

Hydrologically transported dissolved organic carbon influences soil respiration in a tropical rainforest