5Lal R. Forest Soils and Carbon Sequestration[ J]. Forest Ecology and Management,2005 ( 220 ) : 242.
6Jonhson C E, Jonhson A H, Huntington T O, et al. Whole--tree clear cutting effects on soil horizons and organic matter poots [ J ]. Journal of American Society of Soil Science, 1991 ( 55 ) :497 - 502.