To study the effects of different vegetation types on runoff generation on slope land in the Three Gorges reservoir area of the Yangtze River

4 standard runoff plots with different vegetation types were laid out in the J inyun Mountains

Chongqing City. The different vegetation types included mixed broadleaf-conifer forest

broadleaved forest

Phy l lostachys pubescens forest

and shrub. Rainfall and surface runoff from the plots were measured. Results show that vegetation types

in terms of the averaged value of surface runoff depth

were ranged in the order of Phy l lost achys pubescens forest > broadleaved forest > mixed broadleaf -conifer forest > shrub. Surface runoff depths for the vegetation types are found to be 3.094

1.972

1.751

and 1.170 mm. The amount of surface runoff in selected arbor forestlands is smaller than that in Phy l lost achys pubescens forest and significant difference in the amount of surface runoff does not exist in mixed broadleaf-conifer forest

broad2leaved forest

and shrub. The correlation between rainfall amount and surface runoff in forestlands is significant and the correlation between rainfall intensity and surface runoff in forestlands are not notable. Under the same rainfall condition

the variation tendencies of surface runoff in these types of forestlands are different and the amount of surface runoff in Phyllostachys pubescens forest is always the largest.