DOM has also been reported to play an important role in the chemistry of heavy metals
in soils because it forms organometallic complexes or is preferentially adsorbed onto soils surface in place of metals. Thus, if DOM in soil affects the bioavailability of heavy metals, the management of soil organic matter, such as the use of organic amendment , may enhance heavy metal extraction by plants in metal-contaminated soils. Moreover, the capacity of organic substances to promote plant growth and improve macro- and micronutrient uptake has been widely recognized.