溶解有机碳
富营养化
环境科学
水质
水文学(农业)
碳纤维
碳循环
生态系统
地表水
环境化学
化学
生态学
环境工程
地质学
营养物
材料科学
复合数
生物
复合材料
有机化学
岩土工程
作者
Xiang Li,J. Wang,Junjie Lin,W. Yin,Yuning Shi,L. Wang,H. Xiao,Z.M. Zhong,Huawei Jiang,Zhihua Shi
出处
期刊:Water Research
[Elsevier]
日期:2022-11-01
卷期号:226: 119220-119220
被引量:1
标识
DOI:10.1016/j.watres.2022.119220
摘要
The dissolved carbon concentration, which is responsible for aquatic ecosystem productivity and water quality, is tightly coupled with hydrological processes. Excess dissolved carbon may exacerbate eutrophication and hypoxia in aquatic ecosystems and lead to deterioration of water quality. Storm events dominate the dynamics of dissolved carbon concentrations, and this nonlinear behavior exhibits significant time scale dependence. Here, we identified inter- and intra-event variability in the dissolved carbon concentration-discharge (C-Q) relationship in an agriculture-intensive catchment. The driving factors of C-Q hysteresis patterns for dissolved inorganic carbon (DIC) and organic carbon (DOC) were quantified by redundancy analysis combined with hierarchical partitioning. At the inter-event scale, DIC exhibited mainly clockwise hysteresis, indicating an exhaustible, proximal source (e.g., groundwater). However, DOC hysteresis was generally counter-clockwise, indicating distal and plentiful sources (e.g., soil water) in the agricultural catchment. Hierarchical partitioning showed that total rainfall, peak discharge and flood intensity explained 28.38% of the total variation in C-Q hysteresis for DIC and 39.87% for DOC at the inter-event scale. At the intra-event scale, time series analysis of dissolved carbon concentration and discharge indicated the interconversion of supply limitation to transport limitation, which depends on the activation of the specific DIC or DOC source zones. These findings provide significant insights into understanding the dynamics of dissolved carbon during storm periods and are important for targeted watershed management practices aimed at reducing carbon loading to surface waters.
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