Chin J Plant Ecol     1999 23 (5):  458-465    ISSN: 1005-264X:  CN: 11-3397/Q Preliminary Study of Tractive Effect of Lateral Roots of Pinus yunnanensis on Shallow Soil Mass ZHOU Yue, CHEN Xiao-Ping, LI Yu-Hui, LUO Hua-Song and XU Qiang Received null  Revised null  Online null Reference   Corresponding author: LIN Peng