Results show that the greenbelt is a man-made phytocommunity, with pinu massoniana and eucalyptus being the dominant species and the coverage rate over 85%.
In the cool seasons, Navicula subminuscula, a eurythermal species, was the major dominant species, while warm water species increased rapidly with increasing air temperature.
For the heredity of the early mature traits, the additive effect took the dominant position, but the effects of the nonadditive gene and reverse cross could not be ignored.
Among them East Asian element predominated over the other elements, making up 51.35 percent of the total species ,then Oriental element occupying 25.51%, Palaearctic 18.45% and Eurytopic only 2.26%.