Soil erosion control effectiveness of Vetiveria zizanioides root system in the purple soil cropland

The direct cutting natural grass and vetiver grass (Vetiveria zizanioides) and the washing undisturbed soil experiments were used to analyze the soil erosion effect of their root system at the slope of 3° and 25° of purple soil. Results showed that: 1) The vetiver root system altered the soil structure, indicating that the soil bulk density was significantly negative correlated with root length density and surface area density (Pvetiver grass 25°>natural grass grass 3°>natural grass 25°; On different experimental plot, soil antiscouribility index showed as vetiver grass 3° >vetiver grass 25° >natural grass 3°>natural grass 25°; 4) Compared with the natural grass, soil structure with vetiver was more stable, and had stronger ability of shear strength and soil antiscouribility; And the vetiver showed the soil erosion effect in sloping cropland of 3° and 25°.