wAbstract
@Due to the existence of fragile karst geo-ecological environments,
such as environments with extremely poor soil cover, low soil-forming
velocity, and fragmentized terrain and physiognomy, as well as
inappropriate and intensive land use, soil erosion is a serious
problem in Guizhou Province, which is located in the centre of
the karst areas of southwestern China; evaluation of soil loss
and spatial distribution for conservation planning is urgently
needed. This study integrated the revised universal soil loss
equation (RUSLE) with a GIS to assess soil loss and identify risk
erosion areas in the Maotiao River watershed of Guizhou. Current
land use/cover and management practices were evaluated to determine
their effects on average annual soil loss and future soil conservation
practices were discussed. Data used to generate the RUSLE factors
included a Landsat Thematic Mapper image (land cover), digitized
topographic and soil maps, and precipitation data. The results
of the study compare well with the other studies and local data,
and provide useful information for decision makers and planners
to take appropriate land management measures in the area. It thus
indicates the RUSLE-GIS model is a useful tool for evaluating
and mapping soil erosion quantitatively and spatially at a larger
watershed scale in Guizhou.
Keywords: Soil erosion; RUSLE; GIS; Guizhou Province; Chinax
Introduction
@Study area
Materials and methods
@Rainfall erosivity factor (R)
@Soil erodibility factor (K)
@Topographic factor (LS)
@Cover and management practices factor (C)
@Support practice factor (P)
Results and discussion
@Actual annual soil loss
@Potential annual soil loss
@Capability of preventing soil erosion
@Conservation practices for soil erosion
Conclusions
Acknowledgments
References