By the experiments of water retention capability for the red-brown purple soils

grey-brown purple soils

and brown purple soils that were disturbed or undisturbed

the effects of gravel on water retent ion capabilities of purple gravelly soils in a hilly area were studied. Results showed that by considering gravel of undisturbed soils

the saturated water contents were reduced by 0.70%~ 10.70% and the field capacities

by 2.07%~ 4.33%. When the gravel content was less than 10%

it did not have an obvious relationship with the saturated water content sand field capacities of undisturbed soils. When the gravel content was more than 10%

the saturated water content sand field capacities increased with the decreased gravel content. At 0~ 30kPa

the water-holding capacities and the avalues of power functions for undisturbed and disturbed soils

the clay contents of undisturbed soils

and the specific water capacities of disturbed soils were all increased with the decreased gravel content. The specific water capacities of undistur bed soils decreased with the decreased gravel content.