While I'm aware that O.M. affects metal availability according to it's composition and several other factors, would plants have gretaer or lower acess to metals in high O.M. conditions?
Heavy metals can be involved in a series of complex chemical and biological interactions. The most important factors which affect their mobility are pH, sorbent nature, presence and concentration of organic and inorganic ligands, including humic and fulvic acids, root exudates and nutrients.
The HV mobility, bioavailability, toxicity, and environmental fate are controlled by biogeochemical transformations that either form or destroy metal-bearing carrier phases, or modify the redox state and chemical element speciation
See" Mobility and biovailability of HM and metalloids in the soil," Violante et al. (2010) J. Soil. Sci. Plant Nutr. 10 (3): 268 - 292 (2010)
In addition to what Mamdouh Abdel-Sabour said, organic matter (OM) is a chelating agent and hence has ability of holding and exchanging positively charged metal ions in the soil. So, the higher the OM, the more likely will be the cations adhering into it.
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