海南岛岩石风化及碳循环.pdf

Environ Earth Sci (2016) 75:436 DOI 10.1007/s12665-016-5250-0 ORIGINAL ARTICLE Riverine hydrochemistry and CO2 consumption in the tropic monsoon region: a case study in a granite-hosted basin, Hainan Island, China Qianzhu Zhang1 • Zhen Tao1 • Zanwen Ma1 • Wenkui Tang1 • Quanzhou Gao1,2 • 1 3 Peng Xu • Youwen Lin Received: 19 September 2015 / Accepted: 1 November 2015 Springer-Verlag Berlin Heidelberg 2016 Abstract To evaluate the carbon sink capacity caused by 0.62 t km-2 year-1, respectively. Chemical weathering rock chemical weathering processes and its controlling rates in global granite-hosted basins significantly correlate factors in the tropical monsoon region, the hydrochemistry with temperatures (P \0.01) and rapidly increase when of the granite-hosted Changhuajiang River (CHJR) basin in temperatures are up to 24 C. There are two kinds of Hainan Island, China, were systematically investigated by relationship between chemical weathering rates and runoff collecting water samples from the river mouth to headwater depths: logarithmic pattern (temperatures \10 C) and in the dry season and the wet season, respectively. The linear pattern (temperatures [10 C). On a regional scale, results show that Na?, Ca2? and HCO3- are dominant in we find that the chemical weathering rates in the southern the chemical runoff of the CHJR. The spatial and temporal China appear a weak positive correlation with normalized variations of major ions imply the influence of the multi- differential vegetation indexes (NDVI), which need to be sources. The concentrations of Ca2?, Mg2?, HCO3- and confirmed by enough data. The flux of atmospheric CO2 DSi, mainly sourcing from rock (silicates and carbona