干旱区生态环境知识资源中心(Arid): Erosion at hillslope and micro-basin scales in the Gilbues desertification region, Northeastern Brazil

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DOI	10.1002/ldr.3809
	Erosion at hillslope and micro-basin scales in the Gilbues desertification region, Northeastern Brazil
	Simplicio, Antonio A. F.; Costa, Carlos A. G.; Navarro-Hevia, Joaquin; de Araujo, Jose Carlos
通讯作者	de Araujo, JC
来源期刊	LAND DEGRADATION & DEVELOPMENT
ISSN	1085-3278
EISSN	1099-145X
英文摘要	With an area of 6,200 km(2), the Gilbues badlands region in the Brazilian drylands is the largest desertification site in the Country. It is located upstream the Boa Esperanca Hydroelectric Power Plant and is contiguous to an important Brazilian agricultural area. However, primary quantitative data on erosive processes are scarce or nonexistent. We analyzed on-site data (2018-2019) concerning small-scale (hillslope and micro basin) processes: inter-rill gross erosion, vegetation coverage factor, sediment yield, and sediment delivery ratio. We measured gross erosion in four hillslopes using metal pins; rainfall erosivity using an automatic meteorological station; soil erodibility; and siltation of five check-dams that control micro basins (10(1)-10(3) m(2)) by means of an unmanned aerial vehicle. Gross erosion (10(2) Mg ha(-1) yr(-1); 7.5 mm yr(-1)) is up to 100-fold the regional mean value and up to 45-times the tolerable soil-loss reference value (0.17 mm yr(-1)), showing that degradation still evolves. Sparse small vegetation directly exposes two thirds of the soil, with a high vegetation factor (0.90). The sediment delivery ratio of the micro basins is 0.88, compatible with low (12%) sediment-deposition pattern at this scale. The Maner delivery-ratio model mimicked field observation, which indicates that relief is the key element influencing sediment deposition there. The check-dam effectiveness considerably decreased after the first decade of operation due to high siltation rates. Although the Gilbues badland occupies only 5% of the basin upstream of the power plant, it contributes 32% of the sediment load to reservoir and dam. This shows the relevance of the badland restoration for the regional sustainability of water and energy supply.
英文关键词	badlands check‐ dams inter‐ rill gross erosion sediment delivery ratio USLE vegetation
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000590610600001
WOS关键词	SOIL LOSS TOLERANCE ; SEDIMENT YIELD ; LAND-USE ; SEMIARID ENVIRONMENT ; SUSPENDED SEDIMENT ; RUNOFF ; WATER ; CATCHMENT ; TRANSPORT ; RESTORATION
WOS类目	Environmental Sciences ; Soil Science
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/328511
作者单位	[Simplicio, Antonio A. F.] IFMA Fed Inst Sci Technol & Educ Maranhao, Codo, Brazil; [Simplicio, Antonio A. F.; Costa, Carlos A. G.; de Araujo, Jose Carlos] Univ Fed Ceara, Dept Agr Engn, Campus Pici,Bloco 804, BR-60356001 Fortaleza, Ceara, Brazil; [Navarro-Hevia, Joaquin] Valladolid Univ, Agr & Forest Engn, Palencia, Spain
推荐引用方式 GB/T 7714	Simplicio, Antonio A. F.,Costa, Carlos A. G.,Navarro-Hevia, Joaquin,et al. Erosion at hillslope and micro-basin scales in the Gilbues desertification region, Northeastern Brazil[J].
APA	Simplicio, Antonio A. F.,Costa, Carlos A. G.,Navarro-Hevia, Joaquin,&de Araujo, Jose Carlos.
MLA	Simplicio, Antonio A. F.,et al."Erosion at hillslope and micro-basin scales in the Gilbues desertification region, Northeastern Brazil".LAND DEGRADATION & DEVELOPMENT