JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 1998, Vol. 41 ›› Issue (01): 71-74.doi: 10.3969/j.jssn.1000-2006.1998.01.017
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Zhao Linsen(Xinjiang Agriculture University Urumqi 830052) Xu Xizeng Cui Peiyi Fan Xinmin(Nanjing Forestry University)