The accumulation amount of litter

litter carbon and nitrogen contents

soil available nutrients contents

soil organic carbon content(SOC)

and soil soluble carbon(DOC)content were studied in 1m ×1m (tree 20m×20m)plots of grasslands and plantations in Guizhou karst areas.The results indicate that the litter accumulation amounts under the plantations of E.ulmoides

R.pseudoacaciat

P.salicina

A.cremastogyne

and C.duclouxiana were 5.29

3.32

4.26

9.68

and 1.81t/hm2;respectively

which were 1.12to 5.98times of that of the natural grassland.The C:N ratios of the litters increased from 12.84to 57.68after vegetation restoration.The litter accumulation amount correlated significantly positively with the soil rapidly-available potassium contents

rather than the soil hydrolysis nitrogen and effective phosphorus contents.Compared with natural grassland(SOC 7.28g/kg)

the organic carbon content of the soils under E.ulmoides

R.pseudoacaciat

P.salicina

A.cremastogyne

C.duclouxianaincreased by 5.24

12.14

6.04

8.93

and 6.78times respectively.The soil organic carbon content showed no significant relationship with litter amount.However

the relationship between the accumulation amounts of litter and the soluble carbon contents was significant linear in 0—10cm soil layers

but not in the layers below.