气候变化领域集成服务门户(CCPortal): Runoff-driven export of terrigenous particulate organic matter from a small mountainous river: sources, fluxes and comparisons among different rivers

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DOI	10.1007/s10533-019-00629-7
	Runoff-driven export of terrigenous particulate organic matter from a small mountainous river: sources, fluxes and comparisons among different rivers
	Qiao J.; Bao H.; Huang D.; Li D.-W.; Lee T.-Y.; Huang J.-C.; Kao S.-J.
发表日期	2020
ISSN	1682563
卷号	147 期号:1
英文摘要	The land-to-ocean export and subsequent preservation of terrestrial particulate organic carbon (POC) in oceans represents a major carbon sink in the global carbon cycle. Small mountainous rivers (SMRs) are hotspots of this process; however, how the sources and fluxes of POC change during rain events in low-gradient SMRs and how they compare with those in steep SMRs are unknown. Here, we combined the bulk properties and lignin phenols to trace changes in POC sources and fluxes in a low-gradient SMR (stream gradient: 0.6%) in southeastern China. Our results were further compared with other SMRs to understand the geomorphological influences on the POC export from SMRs. The results indicated that POC sources changed from aquatic organisms and deep soils during low-flow periods to surface soils and plant debris during high-flow periods. The lignin concentration showed a significant positive relationship with the runoff, suggesting that hydrology played an important role in exporting terrigenous POC in low-gradient SMRs. We further estimated that approximately 22%, 56% and 79% of annual water, POC and particulate lignin were exported during high-flow periods, respectively. Furthermore, we found that with increasing water discharge, the magnitude of the lignin increase was greater in SMRs with smaller stream gradients. Our results suggest that the export of terrigenous POC from low-gradient SMRs is driven by hydrology and is more sensitive to rain events than that in steep SMRs. © 2019, Springer Nature Switzerland AG.
英文关键词	Lignin phenols; Particulate organic carbon; Rain event; Stable carbon isotope; Stream gradient
学科领域	biogeochemistry; carbon sink; comparative study; lignin; mountain stream; nutrient cycling; particulate organic carbon; phenolic compound; rainfall-runoff modeling; runoff; terrigenous deposit; China
语种	英语
scopus关键词	biogeochemistry; carbon sink; comparative study; lignin; mountain stream; nutrient cycling; particulate organic carbon; phenolic compound; rainfall-runoff modeling; runoff; terrigenous deposit; China
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120397
作者单位	State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, 361102, China; Laboratory of Marine Isotopic Technology and Environmental Risk Assessment, Third Institute of Oceanography, Ministry of Natural Resource, Xiamen, 361005, China; Key Laboratory of Marine Chemistry Theory and Technology, Ocean University of China, Ministry of Education, Qingdao, 266100, China; Department of Geography, National Taiwan Normal University, Taipei, Taiwan; Department of Geography, National Taiwan University, Taipei, Taiwan
推荐引用方式 GB/T 7714	Qiao J.,Bao H.,Huang D.,et al. Runoff-driven export of terrigenous particulate organic matter from a small mountainous river: sources, fluxes and comparisons among different rivers[J],2020,147(1).
APA	Qiao J..,Bao H..,Huang D..,Li D.-W..,Lee T.-Y..,...&Kao S.-J..(2020).Runoff-driven export of terrigenous particulate organic matter from a small mountainous river: sources, fluxes and comparisons among different rivers.Biogeochemistry,147(1).
MLA	Qiao J.,et al."Runoff-driven export of terrigenous particulate organic matter from a small mountainous river: sources, fluxes and comparisons among different rivers".Biogeochemistry 147.1(2020).