7FAO. FESLM: An International Framework for Evaluating Sustainable land Management[R]. World Soil Resources Report 73. 1993.
8Nair, p. K. R., Classification of Agroforestry systaunabls [J ]. Agro-forestry system. 1985, (3) :97-128.
9Acton D F, Gregorich LJ. The Health of Our Soils: toward sustainable agriculture in Canada [ M ]. Centre for Land and Biological Resources Research, Research Branch, Agriculture and Agri-Food Carmda, 1995.
10Doran J W and Jones AJ. (eds.) : Methods for Assessing Soil Quality[J]. SSSA special publication. 1996, (47).
