In order to investigate the effect of changes of forest type converted from chinese hickory(Carya cathayensis Sarg.)-evergreen broad-leaved mixed forest to pure C. cathayensis forest on litter and soil hydrological characteristics

we studied the difference of the water conservation abilities between C. cathayensis broad-leaved mixed forest and pure C. cathayensis forest in 0

5

10 and 20 a by using comparative sampling adjacent plots method. Results showed that woodland litter water-holding capacity

absorption rate and soaking time relations were in line logarithmic and exponential functions. The 0 a woodland litter accumulation

maximum water-holding capacity and effective interception amount were significantly higher than 5

10

20 a C. cathayensis woodlands. As the extension of managing time

the woodland litter accumulation

maximum water-holding capacity and effective interception amount showed a downward trend. Compared with 0 a woodland

others decreased by 38.2%~54.6%

58.1%~69.7% and 21.0%~33.2%. The differences of the soil bulk density

non-capillary porosity

capillary porosity

total capillary porosity and water holding capacity and other indicators in different managing histories of C. cathayensis forest were not significant. Compared with the water-holding capacity (21 450.0 t/hm2) of 0 a woodland soil

through different years of management

the water-holding capacity decreased from 10.6% to 20.4%. All of these indicate that the forest litter and soil hydrological effects were reduced after the C. cathayensis evergreen broad-leaved mixed forest was converted to pure C. cathayensis forest.