Influence of application of rice straw and Chinese mile vetch on the species and ecological effect of added copper in two soils
稻草和紫云英对土壤外源铜的形态及生态效应的影响

The effect of application of rice straw and Chinese milk vetch on the species and ecological effect of added copper in a red soil and a fluvo aquic soil was studied by pot experiments. The two organic materials both significantly reduced the content of exchangeable Cu while increased stably organic bound Cu and amorphous Fe bound Cu. The contents of exchangeable Cu were negatively correlated with pH and the contents of stably organic bound Cu. Rice straw and Chinese milk vetch significantly inhibited the Cu absorption of rice root whereas enhanced the migration of Cu from root to stem and leaves, and from stem and leaves to grains to some extent. Cu contents in grains were decreased by applying rice straw. Applying Chinese milk vetch did not affect Cu contents in grains by red soil treatments while lowered those by fluvo aquic soil treatment.