Fig. 9

Schematic diagram of vegetation buffer zone between Beijing-Hangzhou Grand Canal and coastal cultivated land. In the figure, the orange blocks represent bare land, the green blocks represent arable land, the blue-green blocks represent vegetative buffer zones, and the black arrows indicate pollution inputs. The white dotted circle boxes indicate the purification effect of vegetation buffer zones along the Suzhou section of the Beijing-Hangzhou Grand Canal on pollution inputs from arable land/bare land; the upper right corner is a schematic diagram of the principle of sewage purification by vegetation buffer zones