Zonal characteristics of sediment-bound organic carbon loss during water erosion: A case study of four typical loess soils in Shaanxi Province

doi:10.1016/j.catena.2017.05.001

	Zonal characteristics of sediment-bound organic carbon loss during water erosion: A case study of four typical loess soils in Shaanxi Province
	Li, Zhongwu 1,2,3,4; Nie, Xiaodong 3,4; He, Jijun 5; Chang, Xiaofeng 1,2; Liu, Chun 1,2,3,4; Liu, Lin 1,2; Sun, Liying 6
刊名	CATENA
	2017-09-01
卷号	156 页码:393-400
关键词	Soil organic carbon Chinese Loess Plateau Zonal soils Simulated rainfall events
ISSN号	0341-8162
DOI	10.1016/j.catena.2017.05.001
通讯作者	Li, Zhongwu(lizw@hnu.edu.cn)
英文摘要	The soils of the Loess Plateau of China exhibit zonal characteristics, with declining clay percentages from the southern to northern regions. However, these differences have been largely ignored in studies of soil erosion and the related organic carbon (OC) loss. The goal of this study was to investigate the effect of gradual changes in soil texture on the loss and selective transport of soil and soil organic carbon (SOC) on the Loess Plateau of China. Four typical soils with decreasing clay contents (26.3%, 21.2%, 15.6% and 12.1%) in Shaanxi Province were selected and studied. Rainfall-simulated experiments were performed in 1 m (width) x 5 m (length) plots with a rainfall intensity of 120 mm h(-1) on three slope gradients (15, 20 and 25). The runoff and sediment yields, particle size distributions of the sediments, OC concentrations and enrichment ratios of OC in sediment (ERoc) during rainfall processes were measured and calculated. A comparison of the rainfall characteristics between rainfall events in different soils indicated that a decrease in the clay percentage increased the intensity of rill erosion. The runoff rates of different events decreased with the clay percentage, whereas no general pattern was observed in the sediment yield rate due to differences in the initial timing and intensity of rill erosion. Furthermore, the ERoc values in the sediments of all the events were between 0.64 and 1.44, with 90% of values between 0.80 and 1.20. Similarly, the effective particle size distribution of the sediments exhibited relatively constant values with rainfall duration. Non-significant correlations (P > 0.05) between ERoc and dispersed and non-dispersed sediment particles suggested that the transport of sediment and OC was non-selective. Moreover, significant linear correlations were observed between the amount of SOC loss and sediments in all the events. However, there was no significant difference in total SOC loss between the rainfall events, except for in events with a soil clay percentage of 15.6%. SOC losses in soils with 26.3% and 21.2% clay percentages were mainly due to the high SOC concentrations of the original soils, whereas those in other soils were due to the large amount of lost sediment. However, the variations in soil loss and SOC loss were not associated with changes in the clay content of the soil. These results suggest that zonal soils with decreasing clay contents do not influence the selective transport of OC, but soil textures affect the sediment and SOC loss through complicated mechanisms.
资助项目	'Hundred-talent Project' of the Chinese Academy of Sciences[A315021407] ; National Natural Science Foundation of China[41271294] ; National Natural Science Foundation of China[41471229]
WOS关键词	SIMULATED RAINFALL CONDITIONS ; PHYSICAL-PROPERTIES ; SIZE-SELECTIVITY ; ERODED SEDIMENT ; CLIMATE-CHANGE ; OVERLAND-FLOW ; STEEP SLOPES ; LOAM SOIL ; LAND-USE ; RUNOFF
WOS研究方向	Geology ; Agriculture ; Water Resources
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000404305700039
资助机构	'Hundred-talent Project' of the Chinese Academy of Sciences ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/63355]
专题	中国科学院地理科学与资源研究所
通讯作者	Li, Zhongwu
作者单位	1.Chinese Acad Sci, State Key Lab Soil Eros & Dryland Farming Loess P, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 2.MWR, Yangling 712100, Shaanxi, Peoples R China 3.Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China 4.Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha, Hunan, Peoples R China 5.Capital Normal Univ, Base State Lab Urban Environm Proc & Digital Mode, Key Lab Informat Acquisit & Applicat 3D, Minist Educ, Beijing 100048, Peoples R China 6.Chinese Acad Sci, Key Lab Water Cycle & Related Land Surface Proc, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Li, Zhongwu,Nie, Xiaodong,He, Jijun,et al. Zonal characteristics of sediment-bound organic carbon loss during water erosion: A case study of four typical loess soils in Shaanxi Province[J]. CATENA,2017,156:393-400.
APA	Li, Zhongwu.,Nie, Xiaodong.,He, Jijun.,Chang, Xiaofeng.,Liu, Chun.,...&Sun, Liying.(2017).Zonal characteristics of sediment-bound organic carbon loss during water erosion: A case study of four typical loess soils in Shaanxi Province.CATENA,156,393-400.
MLA	Li, Zhongwu,et al."Zonal characteristics of sediment-bound organic carbon loss during water erosion: A case study of four typical loess soils in Shaanxi Province".CATENA 156(2017):393-400.