稻草和紫云英对土壤外源铜的形态及生态效应的影响

研究稻草和紫云英对红壤和潮土中外源铜的形态及其对水稻有效性的影响，结果表明稻草和紫云英均显著降低了交换铜的含量，提高了紧有机结合态和无定形氧化铁结合态铜的含量，交换态铜含量与土壤ｐＨ值及有机态铜含量呈显著负相关，稻草和紫云英显著地抑制了水稻根对铜的吸收，但在一定程度上促进了根铜向茎叶及茎叶铜向谷粒迁移，稻草显著降低了低糙米中铜的含量，紫云英降低潮土处理糙米中铜的含量但对红壤处理的糙米的铜含量则没有

Influence of application of rice straw and Chinese mile vetch on the species and ecological effect of added copper in two soils

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.