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Applied and Environmental Soil Science
Volume 2009, Article ID 464767, 8 pages
Research Article

Magnitude of Annual Soil Loss from a Hilly Cultivated Slope in Northern Vietnam and Evaluation of Factors Controlling Water Erosion

1Institute of Tropical Agriculture, Kyushu University, Fukuoka 812-8581, Japan
2Faculty of Natural Resources and Environment, Hanoi University of Agriculture, Hanoi, Vietnam
3Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan

Received 26 December 2008; Revised 24 June 2009; Accepted 9 September 2009

Academic Editor: Yongchao Liang

Copyright © 2009 Kiyoshi Kurosawa et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A soil erosion experiment was conducted in northern Vietnam over three rainy seasons to clarify the magnitude of soil loss and factors controlling water erosion. The plot had a low (8%) or medium (14.5%) slope with land-cover of cassava or morning glory or being bare. Annual soil loss (177 to 2,361 g/ ) was a tolerable level in all low-slope plots but was not in some medium-slope plots. The effects of slope gradient and seasonal rainfall on the mean daily soil loss of the season were confirmed, but the effect of land-cover was not, owing to the small canopy cover ratio or leaf area index during the season. The very high annual soil loss ( 2,200 g/ ) observed in the first year of some medium-slope plots was the site-specific effect from initial land preparation. Since the site-specific effect was large, the preparation must be done carefully on the slope.