Study on Ecological Risk Evaluation and Optimum Selection of Desert Expressway Schemes Based on the Two-Dimensional Cloud Model

Figure 5

First-level indexes’ risk cloud. (a) Disturbance of the living environment of wild animals and plants. (b) Destruction of natural ecological landscape. (c) Pollution of water and soil resources. (d) Development and utilization of natural resources.

(a)

(b)

(c)

(d)