For developed eluvial horizon (A)

illuvial horizon (B)

transition horizon (BC) and the parent material horizon (C) of granite collapsing gullies region in Tongcheng

Hubei province

the impact of slope and flow on soil anti–scouribility and related soil physical properties were explored. Specifically

the slope were 8.8％

17.6％

26.8％

36.4％

and 46.6％

and the flow were 0.2 L/s

and 1.0 L/s

respectively. The results showed that physical and chemical properties were ⑴ significant different among layer A

layer B

layer BC

and layer C of granite collapsing gully soil. ⑵ When the flow was constant

index of soil anti-scourability showed a decreasing trend

with the increase of the slope; when the slope was constant

the index under high flow conditions was low; at the same slope and flow conditions

the index decreased from layer A to layer C

indicating that layer A has the best anti-scourability

while layer C has the worst. ⑶ The soil anti-scourability index of all layer decreased linearly with the increase of the slope (p<0.05)

and the erosion resistance of soil decreased with the increase of the slope. The absolute values of the coefficients of regression equation in layer A were the largest and the constant was also the largest. This shows that theanti-scourability of layer Achanges sharply with the slope

the erosion resistance of layer A is the strongest and the soil loss is the least. ⑷ There was a positive correlation between soil anti-scourability index and the content of silt

clay content

water stability index and permeability coefficient

and negative correlation with soil dry density and sand content. The correlation between dry density and water stability index was very high

which showed extremely significant correlation. The soil anti-scourability was positively correlated with organic matter content

CEC and free iron Oxide

while negatively correlated with soil pH

specifically

the correlation coefficient with the organic matter content was greater than 0.9

which was extremely significant.