In order to investigate the beneficial regulations of soil and water conservation in different vegetation types of reclamation areas of open-cut coal mine dump

the research about the vegetation litter was carried out in the 5 typical vegetations of the reclaimed land

including Robinia pseudoacacia， Ulmus pumila， mixed forests (Robinia pseudoacacia and Ulmus pumila)

shrub and weeds

by means of cutting ring method. The results showed that the litter thickness and cumulated amount in 5 sample areas were in the order of forest>shrub>weeds land. The litter thickness was ranged from 0.8 cm to 1.64 cm

the cumulated litter amount was ranged from 0.72 t/hm2to 7.51 t/hm2; the maximum water holding capacity and water conservation ability of litter showed Robinia pseudoacacia maximum

the maximum water-holding rate of litter was 145.58%~206.58%

the maximum water-holding capacity was 13.11 t/hm2~123.98 t/hm2

the effective interception rate was 119.74%~166.05%

the effective interception was 10.09 t/hm2~98.76 t/hm2. The relationship of forest land between litter water-holding capacity and the immersion time was logarithmic function (Q=aln t+b). The litter water absorption rate reached the maximum value at first 0 h ~1 h

then the water absorption rate rapidly decreased in 1 h ~4 h

and finally decreased gradually. The relationship between litter absorption rate and immersion time was power function (V=atb). The study would provide reference for evaluating the water conservation efficiency of litter layer in different reclamation areas of open-cut coal mine dump

and provided scientific basis for the vegetation restoration and reconstruction of the dump.