Study on the evaluation of forestland ecological geochemical early warning of artificial alder forests

Based on the biogeochemical cycle theory, an early warning model of forestry ecological geochemistry is constructed. By testing and analyzing the content of five kinds of geochemical pollution elements in soil´s mother rock, soil, living plants and litters, the ecological geochemical early warning simulation was carried through, in which the main artificial alder forests built in the construction of ecological barrier in Chengdu economic area was taken for example. The simulation shows the artificial alder forests have great capability on repairing the soil polluted by such pollution elements: As, Hg, Pb, Al and Cd. Especially on repairing soil polluted by Cd, it only takes about three years to make the polluted soil purify.