黄河下游颗粒有机碳的来源，降解与输运特征

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Abstract

Both natural processes and human activities in river basins have important impacts on the transport of riverine particulate organic carbon (POC). Knowledge of the sources, decay status and transport of POC in rivers is therefore critical for a better understanding of global carbon cycling. Suspended particulate matters (SPM) monthly collected from the Lijin Station in the lower Yellow River in 2012 were analyzed for grain size, POC contents and stable carbon isotopic ratios (δ¹³C), and lignin composition. The water discharge, SPM contents and median grain size (MGS) at Lijin Station in 2012 were characterized by strong seasonal variations, which were basically identical. In spring, lower water discharge of the Yellow River (300m³/s) was observed compared with other seasons, possibly due to less precipitation and more downstream irrigation activities, making coarser particles more easily to settle down to the river bed. As a result, the SPM contents and MGS were both very low in this season (avg. 0.44kg/m³ and avg. 7.77μm, respectively). In summer and autumn, sediments on river bed were easily resuspended due to high water discharge (more than 1000m³/s), which resulted in high SPM contents (0.67kg/m³) and high MGS (10.6μm). The results of POC and δ¹³C showed that OC contributions from different sources varied among seasons. In spring, the concentration of POC was relatively high and the ¹³C of POC was depleted. The seasonal variation of lignin contents was similar with that of water discharge. The C/V (0.21~0.34) and S/V (0.83~1.28) ratios of lignin phenols indicated that the vascular plant tissues in SPM of the lower Yellow River were a mixture of woody and non-woody angiosperms. Lignin decay parameters, such as (Ad/Al)_v (0.33~0.52), 3,5-Bd/V(0.03~0.12) and P/(S+V) (0.20~0.36) all showed that there was a certain degree of degradation of lignin in SPM. Relatively high degree of lignin decay was observed in autumn, which is probably connected with the variations of water discharge and OC sources during this period.

Key words： Yellow River suspended particulate matters particulate organic carbon stable carbon isotope lignin

Received: 22 August 2016

PACS:

X143

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	Articles by authors
	QIU Lu
	YAO Peng
	ZHANG Ting-ting
	WANG Jin-peng
	PAN Hui-hui
	GAO Li-meng
	ZHAO Bin

Cite this article:

QIU Lu,YAO Peng,ZHANG Ting-ting等. Sources, decay status and transport of particulate organic carbon in the lower Yellow River[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(4): 1483-1491.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2017/V37/I4/1483

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