5Mench M, Martin E. Mobilization of cadium and other metals from two soils by root exudates of Zea mays L. Nicotiana tabacum and L. Nicotaina rustical[ J ]. Plant and Soil, 1991,132 (2) : 187-196.
6Merckx R, Vanginkel J H, Sinnaeve J, et al. Plant - induced changes in the rhizosphere of maize and wheat ( Ⅱ ) : Complexation of cobalt zinc and manganese in the rhizosphere of maize and wheat[ J]. Plant and Soil, 1986,96( 1 ) :95-107.
7Jones D L. Organic acids in the rhizosphere:A critical review[ J ]. Plant and Soil, 1998,205 (1) :25-44.
