Аннотация:To examine the spatial patterns of hydrological variations in the southern and northern East Asia Monsoonal (EAM) region on millennial scales as well as to investigate the relations of hydrological changes on carbon accumulation in the regions with contrasting environmental backgrounds, we performed facies-based hydrological reconstructions at two wetlands, Midiwan wetland (37°39'N, 108°37'E) and Dahu wettland (24°45'N, 115°2'E), respectively, located in a semi-arid loess-desert transitional zone and humid southern China. Our reconstructions show that there is an anti-phase pattern of the precipitation in these two wetlands on a millennial scale. However, with the different responses to the contrasting hydrological conditions, the carbon accumulations at these two sites show in-phase patterns on a millennial scale. These results indicate that the carbon accumulations in the two sites are mainly controlled by the local hydrologic conditions. The wetlands in both southern and northern China were found to be expanding during the interval from 6 to 4 cal. ka BP (ka = kilo annum), as inferred by the higher total organic carbon content. For the Mystery Interval (MI, from 17.5 to 14.5 cal. ka BP), however, both hydrological conditions and carbon accumulations in these two sites showed an in-phase pattern.
