Soil
contamination is typically a man made issue and presents problems such as
decreased soil fertility and crops containing harmful levels of pollutants. One
possible solution is phytoremediation, the use of certain plants that can actually
thrive in these conditions and absorb contaminants like heavy metals from the
ground. People like Leon V. Kochian of Cornell University in Ithaca, NY have
been studying plants like these since the early 1990s.
Unlike
mechanical methods used to decontaminate soils, which disturb the environment
and are not very cost effective, the use of phytoremediation is a clean and
natural way to extract harmful elements into parts of the plant that can be
easily harvested and disposed of.
The plant
commonly known as alpine pennycress is a good example of a plant used for
phytoremediation. It does well in environments containing high levels of cadmium
and zinc, absorbing them using genes that can increase the solubility of such
metals which can then be extracted for other economical uses.
Another
example is a space in Clackamas, OR that was previously an abandoned grassy field
in an industrial area. This particular space had groundwater contaminated by
volatile organic compounds, most likely caused by illegal dumping. Poplar trees
were planted in 1998 and by 2002 they were still alive and thriving. Tissue tests were done
to show that the trees were indeed taking up the volatile organic compounds,
thus showing that phytoremediation could be considered at other sites around
the world.
Sources:
Added by: Will Baker
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