Based on RS and GIS technology,spatial and temporal dynamics of soil erosion were explored by analyzing the change of gully density in 1954 and 2000,taking Keshan County,Heilongjiang Province,as an example.Furthermore,correlation analyses were conducted for related factors in different sub-regions according to change values of gully density.Results showed that,in the past 46 years,gully density in southeastern part declined and that in northwestern part increased.In sub-regions with lessened erosion,changes in gully density negatively correlated to elevation and slope.However,in sub-regions with enhanced erosion,the correlation is positive.Changes in gully density increased when slope length increased.The decision coefficient(R2) between gully density change and slope length,elevation and slope degree was 0.9743,0.6893 and 0.3437 respectively.Slope length plays an important role in affecting soil erosion in upland region of Northeast China.The change of land use has impact on soil erosion degree.In the study area,obvious increase in cultivated land and decrease in grassland accelerated formation of gully.
LI Xiao-Yan, WANG Zong-Ming, ZHANG Shu-Wen, YAN Ye-Chao
. Dynamics and Spatial Distribution of Gully in the Typical Upland Region of Northeast China[J]. SCIENTIA GEOGRAPHICA SINICA, 2007
, 27(4)
: 531
-536
.
DOI: 10.13249/j.cnki.sgs.2007.04.531
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