The roots can significantly increase the soil reinforcement of vegetation, and the fractal theory provides a new perspective for vegetation roots studies. This article applied the Fractal Fox software to calculate the fractal dimension of medicago sativa and cynodon dactylon roots in different growth periods and proved that the two species show fractal characteristics. The conclusions from the analysis are as follows: ①The fractal dimensions of the two plant roots tend to be stable with the increase of growth period; ②The fractal characteristic value of cynodon dactylon root is more significant than medicago sativa root; ③Compared with medicago sativa root, cynodon dactylon root is more effective in increasing the shear strength of soil.

This paper investigates the potential of 3D laser scan technology in landscape ecology from the perspective of basic theory and research method of landscape ecology. Compared with traditional research means, the 3D laser scan technology has more advantages and shown a good prospect in creating digital elevation model and landscape spatial pattern change monitoring.