Though measured stock

natural moisture rate

max water-holding rate

moisture absorbing speed and effective holding-capacity of different litter layers in six communities in Baihua mountainous areas of west Beijing from Jul.to Aug.in 2006.The results showed that

the highest stock was Pinus tabulaeformis's litter about 18.5 t/hm2

the lowest was litter of forbs about 3.9 t/hm2

stock of different litter layers

semi-decomposed litter was higher than un-decomposed litter

natural moisture rate of the different decomposed layers in same communities

semi-decomposed litter was higher than un-decomposed litter layers

the highest one Populus cathayana's difference was 97.1%;Semi-decomposed litter was higher than un-decomposed litter layers of water-holding capacity

it could indicate water-holding ability was relational to the decomposed degree;According to the moisture absorbing speed of litter

it could separate the process to three parts

included fast process(0~1.0 h)

slow process(1.0~5.0 h)

stagnant process(24.0 h);The experiments indicated that effective holding-capacity to rainfall of litter layers

in the declined order of Populus cathayana

Robinia pseudoacacia

Pinus tabulaeformis

Artemisia lavandulaefolia

Vitex negundo

forbs

linear correlation analysis revealed that effective holding-capacity to rainfall of litter layers and stock

max water-holding rate showed positive correlation

especially it with max water-holding rate had significant correlation(n=6

r=0.8396

P<0.002).