It analyses the relationship of various types of plant vegetation

the plant cover

withered matter in forest land with the benefits of water reservation and sediment reduction

The research method is to observe runoff and sediment from the typed plots of vegetation

the comparison between harnessed and contrasted gullies

to determine the amounts of withered matter on the forest land and water reserved

The results shows that the bene-fit of sediment reduction and water reservation is different from differ-ent vegetation type

It is observed that the benefits in water reservationand sediment reduction of grown-up Caragana korshinskii

six to fifteen-years-growing Roinia pseudoacacia

two to eight-years-growing Astragalus adsurgens

the secondary is the one to six-years-rowing Robinia pseudoaccia and one to five-years一growing alfalfa，the runoff from wasted natural grassland is more than from farmland

reducing the soil loss amount significantly

To the same tree species

the greater the forest cover

the more significant the benefit of sediment reduction

The layer of the withe red matter on forest land has an important effect on the water reserva-tion and sediment reduction-