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摘要
Aging reactions in soils can influence the lability and hence bioavailability of added metals in soils through their removal from labile pools into pools from which desorption is slow (non-labile pools). The aims of this study were to examine the effect of aging reactions on the lability of soluble molybdate (MoO42-) added into soils with varying physical and chemical properties and develop models to predict changes in the labile pool of MoO42- in soils with incubation time. Soils were spiked with soluble MoO42- at quantities sufficient to inhibit barley root growth by 10% (EC10) or 90% (EC90) and incubated for up to 18 months. The labile pool of MoO42- (E value) was observed to decrease in soils with incubation time, particularly in soils with high clay content. A strong relationship was observed between measures of MoO42- lability in soils determined using E and L value techniques (R-2 = 0.98) suggesting E values provided a good measure of the potential plant available pool of MoO42- in soils. A regression model was developed that indicates clay content and incubation time were the most important factors affecting the labile pool of MoO42- in soils with time after addition (R-2 = 0.70-0.75). The aging model developed suggests soluble MoO42- will be removed into non-labile pools more rapidly with time in neutral to alkaline clay soils than in acidic sandy soils. Labile MoO42- concentrations in molybdenum (Mo) contaminated soils was found to be %26lt;10% of the total Mo concentrations in soils.
- 出版日期2012-10
- 单位中国农业科学院农业资源与农业区划研究所; CSIRO
