The soil reinforcement of plant is closely related to their rootsystems

and root features decide a- bout the function of soil reinforcement.Based on the same soil material but different features of rootsystems of Broussonetia papyrifera and Zanthoxylum bungeanum var.dintanensis

studied on the relationships be- tween rootsystem features and soil anti-scourability

soil anti-erosibility

soil anti-tensile strength or soil compactibility.Research shows that soil anti-scourability could be intensified by seedling rootsystem

the in- tense values are 78.01>77.71;And the rootsystems could improve soil anti-scourability

the order is Broussonetia papyrifera>Zanthoxylum bungeanum var.dintanensis>control

and the waterstable index is 4.36

3.16

1.67

respectively;Different rootsystems show different abilities on soil reinforcement

the soil anti-tensile strength with Broussonetia papyrifera is 214.92 N which is higher obviously than that of Zanthoxylum bungeanurn var.dintanensis which is 154.87 N;The sizes of soil compactibility are Broussonetia papyrifera>Zanthoxylum bungeanum var.dintanensis.And applying weighted composite index method to evaluate the soil reinforcement ability of rootsystems of different features at seedling stage

which shows that the ability of soil reinforcement of Broussonetia papyrifera is more powerful compared with Zanthoxylum bungeanum var.dintanensis

and the comprehensive index is 1.058 and 0.9125

separately.Looking forward to provide some theoretic basises for soil and water conservation work.