9Li X R, Xiao H L, Zhang J G, et al. Long-term ecosystem effects of sand-binding vegetation in the Tengger Desert, Northern China [J]. Restoration Ecology, 2004, 12(3): 376- 390.
10Hill M O, Milauer P. TW1NSPAN for Windows Version 2.3.Centre for Ecology and Hydrology & University of South Bohemia [M]. Huntingdon & Ceske Budejovice. 2005, 5- 26.
