5Dvidlc. Principles of planning and establishment of buffer zones [ J ]. Ecological Engineering, 2005,24 : 433-439.
6Dale A., Devitt, Stanley D., et al. Root channel macropores enhance downward movement of water in a Mojave Desert ecosystem [ J 1. Journal of Arid Environments, 2002 ( 50 ) : 99- 108.
7Wild A. Nitrate leaching under bare faUow at a site in northern Nigeria[J ]. J. Soil Sci., 1972(23):315-324.
8White R. E., Whillings S. R, Bell J. P. Seasonal variations in nitrate leaching in structured clay soil under mixed land use [ J ]. Agric. Cult. Water Manage, 1983 (7) : 391-410.
