caa a22 4500 445300663 CHVBK 20180317142556.0 cr unu---uuuuu 170323e20100801xx s 000 0 eng 10.1007/s11430-010-4007-y doi (NATIONALLICENCE)springer-10.1007/s11430-010-4007-y Chemical weathering and chemical runoffs in the seashore granite hills in South China [Elektronische Daten] [QuanZhou Gao, Zhen Tao] Surface runoffs and the contents of major ions and dissolved silicon were surveyed and analyzed based on weekly sampling for one year in a granite watershed of Zhuhai City, Guangdong Province. The results demonstrated that the slope runoff played an essential role in feeding the rivulet during precipitation, whereas the groundwater was more important for the rivulet in the non-raining stages. Dissolved silicon, Na+, HCO3 −, and Cl− ions constituted the major chemical components of the rivulet water. Atmospheric CO2 and H2SO4 sourced from the oxidation of pyrite were the main erosive mediums in the natural chemical weathering. Natural chemical weathering, the wet and dry deposition of sea-salt, and acids precipitation contributed approximately equal shares of anions to the rivulet water. The ratio of NO3 − to SO4 2− was more than 1.0 in the runoff of the studied seashore watershed, whereas it is less than 1.0 in the Xijiang River that is adjacent to the study area. This implied that the chemical composition of runoff is controlled mainly by the differences in atmospheric acid precipitation caused by human activities and lithology within the catchments under the same bio-climate zone. The CO2 flux consumed by the rock chemical weathering processes within the seashore granite watershed in South China was (0.35-1.37)×105 mol km−2 a−1. Science China Press and Springer-Verlag Berlin Heidelberg, 2010 chemical weathering nationallicence granite nationallicence ion nationallicence sea-salt nationallicence acid deposition nationallicence CO2 nationallicence Gao QuanZhou School of Geography and Planning, Sun Yat-sen University, 510275, Guangzhou, China aut Tao Zhen School of Geography and Planning, Sun Yat-sen University, 510275, Guangzhou, China aut Science China Earth Sciences SP Science China Press 53/8(2010-08-01), 1195-1204 1674-7313 53:8<1195 2010 53 11430 https://doi.org/10.1007/s11430-010-4007-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11430-010-4007-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gao QuanZhou School of Geography and Planning, Sun Yat-sen University, 510275, Guangzhou, China aut NATIONALLICENCE 700 1- Tao Zhen School of Geography and Planning, Sun Yat-sen University, 510275, Guangzhou, China aut NATIONALLICENCE 773 0- Science China Earth Sciences SP Science China Press 53/8(2010-08-01), 1195-1204 1674-7313 53:8<1195 2010 53 11430 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer