气候变化领域集成服务门户(CCPortal): Deposition- and transport-dominated erosion regime effects on the loss of dissolved and sediment-bound organic carbon: Evaluation in a cultivated soil with laboratory rainfall simulations

CCPortal

DOI	10.1016/j.scitotenv.2020.141717
	Deposition- and transport-dominated erosion regime effects on the loss of dissolved and sediment-bound organic carbon: Evaluation in a cultivated soil with laboratory rainfall simulations
	Wang, Linhua; Yen, Haw; Wang, Xiang; Huang, Chi-hua; Sun, Jiamei; Hammac, Ashley; Wang, Yafeng
通讯作者	Wang, YF (通讯作者)
发表日期	2021
ISSN	0048-9697
EISSN	1879-1026
卷号	750
英文摘要	Erosion-induced soil carbon loss has been identified as a critical process in the global carbon (C) cycle. Surface coverage substantially alters the soil erosion process and the effects of net loss or deposition on soil organic C (SOC). However, information on SOC loss induced by soil erosion at the process level is limited. The aim of this study was to investigate how runoff and erosion regimes affect dissolved and sediment-bound organic C (DOC and SBOC) loss. Thus, six simulated rainfall events were conducted on two laboratory plots (9.75 m x 1.83 m) with different surface coverages (17-83%) and coverage distributions (upslope vs. downslope) using polypropylene geotextiles. The results showed that the variability in the process of runoff and sediment yield existed as a result of altered surface coverage over the erosion zone (SSerosion zone) and covered zone (SScovered zone) on the slope. Thus, the erosion regimes can be identified as deposition- and transport-dominated processes, which were the main soil erosion subprocesses. The surface coverage located downslope (SCtop-bottom slope) can more efficiently reduce runoff (21.9-85.7%) and sediment (67.6-98.3%) than the SCbottom-top slope (runoff: 20.1-83.0%; sediment: 35.0-93.3%), which has the surface coverage located upslope. DOC (8.0-11.3 mg L-1) and SBOC (0.3-0.5 mg g(-1)) in the deposition-dominated process on the SCtop-bottom slope were higher than in the transport-dominated process on the SCbottom-top slope (DOC: 6.8-10.2 mg L-1; SBOC: 0.2-0.3 mg g(-1)). The loading of DOC and SBOC was largely dependent on runoff and sediment yield, and DOC load contributed 83.9-89.7% of the SOC loss. Overall, laboratory results highlighted the soil C loss at different hydrological and erosion regimes (deposition- vs. transport-dominated process). This study provides important information that can be used to facilitate further implementations such as watershed modeling of soil C dynamics and the corresponding decision-making processes. (C) 2020 Elsevier B.V. All rights reserved.
关键词	SIZE-SELECTIVITY AGRICULTURAL MANAGEMENT ERODED SEDIMENT WATER EROSION RUNOFF NITROGEN MATTER MULCH FLOW REDISTRIBUTION
英文关键词	Surface coverage; Spatial distribution; Particle size distribution; Erosion regimes; SOC loss
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000585694600102
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260432
推荐引用方式 GB/T 7714	Wang, Linhua,Yen, Haw,Wang, Xiang,et al. Deposition- and transport-dominated erosion regime effects on the loss of dissolved and sediment-bound organic carbon: Evaluation in a cultivated soil with laboratory rainfall simulations[J]. 中国科学院青藏高原研究所,2021,750.
APA	Wang, Linhua.,Yen, Haw.,Wang, Xiang.,Huang, Chi-hua.,Sun, Jiamei.,...&Wang, Yafeng.(2021).Deposition- and transport-dominated erosion regime effects on the loss of dissolved and sediment-bound organic carbon: Evaluation in a cultivated soil with laboratory rainfall simulations.SCIENCE OF THE TOTAL ENVIRONMENT,750.
MLA	Wang, Linhua,et al."Deposition- and transport-dominated erosion regime effects on the loss of dissolved and sediment-bound organic carbon: Evaluation in a cultivated soil with laboratory rainfall simulations".SCIENCE OF THE TOTAL ENVIRONMENT 750(2021).