张士灌区镉污染及其改良途径

张士灌区是国内镉严重污染区。本文全面论述了1981—1983年以来所采取综合防治的效果:①减少灌溉水中Cd浓度,提高pH,改污灌为清灌;②增施石灰、钙镁磷肥等各种改良剂;③农业工程方法、客土、去土;④生物改良方法、种植其他作物,或将污染稻谷作为良种繁育。几年来密切联系生产实际,在污染现场作试验。试验所得结果适合于灌区实际应用。

CADMIUM CONTAMINATION OF ZHANGSHI IRRIGATION AREA AND WAYS OF IMPROVING

Zhangshi Irrigation Area is notorious for its cadmium pollution in this country, which has bad effects in human health through food chain. So it is very imperative to adopt a comprehensive way of prevention and improvement. In this report, various methods have been summed up to decrease Cd uptake by rice plant during 1980-1983. They are by:1. Reducing Cd concentration and increasing pH value in irrigation water,2. Applying soil supplement materials: lime, Ca-Mg-P fertilizer, etc.,3. Taking off polluted surface soil at different depth or covering the polluted top soil with unpolluted one,4. Biological methods: in addition to rice, other kinds of crops are planted, such as soybean, corn, sunflower, etc. and using Cd-polluted rice as breed good strains.These experiments have been carried out in polluted fields. And, conclusions are, of course, suitable for this particular area.