Abstract：A study was conducted on the distribution characteristics of common plants on Jingcheng freeway (The third period), by using the methods of digging out whole root system. Results showed that:1) the total root length and biomass of woody-plants were larger than that of herbaceous-plants. 2)The ratio of root length to biomass of woody-plants reduced gradually with the soil depth, vice verse in herbaceous-plants. Roots of Festuca arundinacea distributed within the scope of 10 cm topsoil. 3) Total length of these plants was Lespedeza bicolor Turcz. > Robinia pseudoacacia L. > Amorpha fruticosa L.and Festuca arundinacea > Astragalus adsurgens Pall. > Medicago sativa L. . For woody-plants, Robinia pseudoacacia L. and Amorpha fruticosa L. had the largest proportion of thick roots and Lespedeza bicolor Turcz. had the largest proportion of thin roots. For herbaceous-plants, Astragalus adsurgens Pall. and Medicago sativa L. had the largest proportion of thick roots, and Festuca arundinacea had the largest proportion of thin roots. 4) The angle of slope and taproots of Robinia pseudoacacia L. , Amorpha fruticosa L. , Medicago sativa L. and Astragalus adsurgens Pall. became smaller gradually as soil depth,and grew down along rock surface finally, or change growth direction when the taproots meeting hard stone, or enter intocrack. 5) The fibres-roots of Festuca arundinacea grew down along sticked stone, and the angle with slope was about 10 degree. Lespedeza bicolor Turcz. had no obvious taproots, therefore, its roots distributed shallow and grew along slope taken trunk as center.
2013, Vol. 11 
