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- Title
Dissolved Organic Carbon Driven by Rainfall Events from a Semi-arid Catchment during Concentrated Rainfall Season in the Loess Plateau, China.
- Authors
Linhua Wang; Haw Yen; Xinhui E; Liding Chen; Yafeng Wang
- Abstract
Dissolved organic carbon (DOC) transported by surface runoff has been identified as an important role of the global carbon cycle. Despite there being many studies on DOC concentration and flux, but little information is available in semi-arid catchments of the Loess Plateau Region (LPR). The primary goal of this study was to quantify DOC exported from a sequence of runoff events during the concentrated rainfall season. In addition, factors that affect DOC export from a small headwater catchment will be investigated accordingly. Runoff discharge and DOC concentration were monitored at the outlet of the Yangjuangou catchment in Yanan, Shaanxi Province, China. The results showed that DOC concentration was highly variable (1.91-34.70 mg L-1), with event-based DOC concentrations ranging from 4.08 to 15.66 mg L-1. The mean monthly DOC flux loading from the catchment was 94.73-110.17 kg km-2 from June to September, while the event-based DOC flux ranged from 0.08 to 2.81 kg km-2. Intra-events of rainfall amount and runoff discharge led to event-based/monthly differences in DOC concentration and flux. Hysteresis analysis showed a nonlinear relationship between DOC concentration and discharge in the runoff process. Our results highlighted the advantages of high-frequency monitoring for DOC export and indicated that DOC export from a catchment is largely influenced by the interaction of rainfall and antecedent conditions for a rainfall event. Engineering and scientists can take advantage of the derived results to better develop advanced field monitoring work. In addition, release of DOC runoff can take quantified during hydrological and biogeochemical processes within catchments in LPR.
- Subjects
RAINFALL frequencies; CARBON compounds; METEOROLOGICAL precipitation; RUNOFF; HYDROLOGIC cycle
- Publication
Hydrology & Earth System Sciences Discussions, 2019, p1
- ISSN
1812-2108
- Publication type
Article
- DOI
10.5194/hess-2019-8