Based on 3 year(2007-2009) continuous observations

characteristics of woodland hydrological effects from the three typical models of converting cropland to forest were studied in Lanningxi small water- shed of the Three Gorges Reservoir region.Results are as follows:(1) Compared with sloping farmland

t he total soil porosity and non-capillary porosity increased from 4.2% to 11.5% and 69.1% to 162.6%

respec- tively. The maximum soil water capacity and non-capillary water capacity increased by 42.5% and 221.4%

respectively

after converting cropland to forest. (2)Initial infiltration rate and stable infiltration rate in A layer for each of the three models were between 2.73and 4.74mm / min and 1.30and 2.96mm /m in

respec-tively

which had no great differences from those on sloping farmland; and in B layer

between 0.14～0.87 mm/ min and 0.06～0.47mm/min

respectively

which were 0.85～5.21and 3.33～6.83times of those on sloping farmland. (3)The surface runoff depths for the three models were between 13.21 and 22.38mm

which were reduced by 74.7%～57.3% as compared with those on cropland.The average annual soil erosion modulus for the three models were between 137.1and 331.1t/km2

which were reduced by 92.4%～81.6% in contrast to CK.