低丘缓坡地雨水的集蓄利用对微量元素碘的影响

Effects of Rainwater Harvesting and Reusing at the Hilly Slope on Trace Elements Iodine

在模拟条件下,通过淋溶试验研究土壤碘的环境地球化学迁移特征,并用缓坡地节水灌溉系统的集成技术,在低丘缓坡地收集雨水,通过在植物周围建立微型集水区,从而把雨水中的微量碘返回土壤,供植物生长发育之需。结果表明,用收集到的蓄积水浇灌土壤,不但可以充分有效地利用自然降水,提高缓坡地的生产力,还可以进一步避免土壤中的微量元素碘被雨水淋溶损失,从而为农作物生长提供更充足的碘元素。

The study aims to research the environmental geochemistry migration features of soil iodine through leaching experiments under simulated conditions,and also by applying an integrated technology of water-saving irrigation system at the gentle slope and collecting rainwater to discuss the practice of establishing a mini-type catchment area around the plants and returning the trace iodine of rainwater to the soil in order to meet the needs of plants for growth and development.The results showed that irrigating soil with collected rainwater could not only effectively facilitate the use of natural precipitation and improve the productivity at gentle slopes,but also avoid the loss of trace iodine in soil resulted from rain washing to provide sufficient iodine for growth of crops.