In order to understand ecohydrology effect of forest soil in Liuxihe small watershed, soil physical characteristics and water conservation characteristics of evergreen broadleaf forest, bamboo forest and litchi forest in Liuxihe small watershed were measured by cutting ring method. The test results showed that: (1)soil bulk density of three types of forest increased with soil layer depth. Soil bulk densities 0—60 cm depth were ranked in the order of litchi forest (1.45 g/cm3), broadleaf forest(1.22 g/cm3), bamboo forest (1.11 g/cm3). (2)Porosity of three types of forest decreased with the soil depth. In 0—60 cm depth, total porosity and capillary porosity of bamboo forest were the max in three types of forest, and total porosity of litchi forest and evergreen broadleaf forest were almost the same. Noncapillary porosities in 0—60 cm depth were ranked in the order of broadleaf forest (11.51 %), bamboo forest(7.38 %), and litchi forest(5.91 %). (3) Water storage capacity in 0—60 cm depth were ranked in the order of broadleaf forest (63.39 mm), bamboo forest(41.86 mm), and litchi forest(33.96 mm). Water draught capacity of 0—60 cm soil depth were ranked in the order of broadleaf forest (65.44 mm), bamboo forest(43.59 mm), and litchi forest(34.68 mm). Therefore, forest of Liuxihe watershed had good effect on soil physical characteristics, and the water conservation capacity of broadleaf forest was better than that of bamboo and litchi forest.
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