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Effects of landuse change on surface runoff and sediment yield at different watershed scales on the Loess Plateau
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.
2010 (English)In: INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH, ISSN 1001-6279, Vol. 25, no 3, 283-293 p.Article in journal (Refereed) Published
Abstract [en]

Erosion and sediment yield from large and small watersheds exhibit different laws. Variations in surface runoff and sediment yield because of landuse change in four watersheds of different scales from 1 km(2) to 73 km(2) were analyzed. Due to reforestation and farmland terracing, surface runoff and sediment yield reduced by 20-100% and 10-100% respectively. Reductions in surface runoff were differed significantly under different precipitation regimes. For the large watershed (73 km(2)) landuse change had similar effects on surface runoff regardless of changing of precipitation. For the small watershed (1 km(2)) landuse change had fewer effects on surface runoff under high precipitation. The relative changes of sediment yield in the four watersheds under reforestation and farmland terracing decreased as precipitation increased from 350 mm to 650 mm, then increased as precipitation increased from 650 mm to 870 mm. Where initial forest coverage rate was below 45%, sediment yield decreased dramatically as forest coverage rate increased. Watershed management with aiming at reducing both surface runoff and sediment yield should be conducted both on sloping surfaces and in channels in large watersheds.

Place, publisher, year, edition, pages
2010. Vol. 25, no 3, 283-293 p.
Keyword [en]
Soil erosion, Land use change, Scale effect, Surface runoff and sediment yield, Watershed, Loess Plateau
National Category
Other Environmental Engineering
URN: urn:nbn:se:kth:diva-26218DOI: 10.1016/S1001-6279(10)60045-5ISI: 000283622000007ScopusID: 2-s2.0-77955471269OAI: diva2:399463
QC 20110222Available from: 2011-02-22 Created: 2010-11-21 Last updated: 2011-02-22Bibliographically approved

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Sihong, Wu
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