School of Public Administration, Zhejiang University of Finance and Economics, Hangzhou, 310018, China.
Business Administration College, Zhejiang University of Finance and Economics, Hangzhou, 310018, Zhejiang, China.
Environ Geochem Health. 2020 Mar;42(3):841-848. doi: 10.1007/s10653-019-00311-9. Epub 2019 Jul 20.
The utilization of reclaimed water is one of the effective measures to save water resources. The study of reclaimed water irrigation and the analysis of how heavy metals migrate in the soil, especially their movement laws, have important theoretical and practical significance. It helps to predict the risk of heavy metals in foods, which protects our health and safety. In this paper, we studied the accumulation and distribution of heavy metal Cd in soils with reclaimed water drip irrigation in greenhouses during growing season, comparing the effects with groundwater drip irrigation. The results show that the Cd concentration in the surface soil is the highest on the second day after drip irrigation. It will be the highest on the fourth day in the depth of 100 cm, and then, it will decrease slightly. During the period of the sixth day to the eighth day, the Cd concentrations are similar in each depth, and it is the highest in the depth of 0-40 cm and 80-120 cm, but the Cd concentration decreases with the lower depth below 120 cm. By utilizing proper ways of reclaimed water drip irrigation, the Cd concentration in the deep soil will not violate the standard limits of GB15618-1995, which will not cause Cd pollution.
再生水的利用是节约水资源的有效措施之一。研究再生水灌溉以及重金属在土壤中的迁移分析，特别是其迁移规律，具有重要的理论和实际意义。它有助于预测重金属在食品中的风险，保护我们的健康和安全。本文研究了温室生长季再生水滴灌条件下重金属 Cd 在土壤中的积累和分布，与地下水滴灌进行了比较。结果表明，滴灌后第二天表层土壤中 Cd 浓度最高，在 100cm 深处第四天达到最高，然后略有下降。在第 6 天至第 8 天期间，各深度的 Cd 浓度相似，在 0-40cm 和 80-120cm 深处最高，但随着深度低于 120cm 而降低。通过合理利用再生水滴灌方式，深层土壤中的 Cd 浓度不会违反 GB15618-1995 的标准限值，不会造成 Cd 污染。
