Temporal and Spatial Variability of Dissolved Organic Carbon Concentration in the Xijiang River, South China

作     者：TAO Zhen GAO Quanzhou GUO Wenping WANG Zhengang ZHANG Yongling XIE Chenji HUANG Xiakun ZHONG Hongwei TAO Zhen 1, GAO Quanzhou 1, GUO Wenping 1, WANG Zhengang 1, ZHANG Yongling 1, XIE Chenji 1, HUANG Xiakun 2, ZHONG Hongwei 3 1 School of Geography and Planning, and Guangdong Key Laboratory for Urbanization and Geo-simulation, Sun Yat-sen University, Guangzhou 510275, China 2 Wuzhou Branch, Guangxi Regional Hydrological and Water Resources Bureau, Wuzhou 543002, China 3 Makou Hydrological Gauge Station, Guangdong Province Hydrological Bureau, Foshan 528100, China

作者机构：School of Geography and Planning and Guangdong Key Laboratory for Urbanization and Geo-simulation Sun Yat-sen University Guangzhou 510275 China Wuzhou Branch Guangxi Regional Hydrological and Water Resources Bureau Wuzhou 543002 China Makou Hydrological Gauge Station Guangdong Province Hydrological Bureau Foshan 528100 China 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2011年第8卷第5期

页      面：694-703页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 070702[理学-海洋化学] 0709[理学-地质学] 07[理学] 0707[理学-海洋科学] 

基　　金：supported by the Natural Science Foundation of China (Grant Nos. 40871143 and 41071054) funds of China Geological Survey (karst Geo-surveying 01-01-23) the Fundamental Research Funds for the Central Universities the Guangdong Provincial Natural Science Foundation of China (Grant No. 7003669) 

主　　题：Export flux Hydrological processes Massive flood Riverine dissolved organic carbon The Xijiang River 

摘      要：A whole year analysis of riverine dissolved organic carbon (DOC) concentrations in the Xijiang River (XJR), South China, showed that the mean riverine DOC concentration (1.24 mg L-1) in the XJR was notably lower than the averaged value (5.75 mg L-1) of the global riverine DOC concentration in several major rivers. There is an inconspicuous monthly fluctuation of the DOC signal in the XJR, but on a semi-yearly time scale, however, the riverine DOC concentration had significant difference between hydrological seasons. The DOC level during the flood season (1.18 mg L-1) was less than that during the non-flood season (1.40 mg L-1). Owing to the concomitance of the flushing and dilution effects of the runoff during the high-water period, the variation of riverine DOC concentration with discharge in the XJR differed from that reported in many other major rivers. The DOC export flux above the city of Wuzhou was about 0.62× 106 g C km-2 yr-1. The DOC transported during the 056 Massive Flood period comprised 30.35% of the annual total, while the discharge accounted for 36.32% of the total annual flow. The characteristics in riverine DOC concentration in the XJR were attributed to the combined effect of the geomorphologic, monsoon climatic and hydrological processes as well as land-use within the drainage basin.