关键词: 复合污染, 重金属元素, 土壤－植物系统, 改性处理, 生源要素, 养分回收, 生物地球化学循环, 土壤类型, 氮磷平衡

Abstract: The effect of Ca,Mg and Pfertilization on the migration and accumulation of heavy metals in combined polluted soil and the response of crops to heavy metals are studied with field tests.The results show that on polluted soil, fertilization with Ca, Mg and Pcan restrain the migration and accumulation of heavy metals, especially Cd, Ph and As to and in crop grains.After fertilization, the adsorption amount of Cd by rice and wheat is decreased by 31.5-55 %.The amount of absorbed Ph in four crops is decreased by 23.4-57.8%, and that of Cu and Zn is slightly decreased.The absorbed As in rice is increased by 56.8%, and that in wheat and soybean is decreased by 61.8-81.1%.The existed forms of heavy metals in soils are changed, i.e., the percentage of exchangeable Cd, Ph and Zn is decreased, that of their carbonates is increased, and their available contents are declined.

Key words: Combined pollution, Heavy metal elements, Soil-plant system, Modification treatment, biogenic element, nutrient resorption, N and P balance, biogeochemical cycle., soil type