Liu Xiaomei, Wu Qitang, Banks M Katherine
Natural Resource and Environmental College, South China Agricultural University, Guangzhou, PR China.
Int J Phytoremediation. 2005;7(1):43-53. doi: 10.1080/16226510590915800.
Land application of biosolids to improve agricultural productivity is a cost-effective approach for resource recovery. Unfortunately, municipal biosolids often contain high concentrations of heavy metals, including zinc and copper. In this study, a co-cropping technique was investigated using a known zinc hyperaccumulator, Sedum alfredii with a grain crop, Zea mays. After a 3-mo growth trial, the results indicate that when Z. mays is co-cropped with S. alfredii, heavy metals accumulated in the grains were significantly reduced when compared to monoculture cropping. Co-cropping improved the growth of both plant species. In addition, the biosolids maintained stable pH, N-P-K concentrations, germination potential, and water content after the plant treatment, regardless of the plant species used in the trial. In conclusion, co-cropping with hyperaccumulators may be an effective approach to reducing the risk of contaminant uptake in edible crops.
将生物固体用于土地以提高农业生产力是一种具有成本效益的资源回收方法。不幸的是，城市生物固体通常含有高浓度的重金属，包括锌和铜。在本研究中，研究了一种间作技术，使用已知的锌超富集植物东南景天与谷类作物玉米进行间作。经过3个月的生长试验，结果表明，与单作相比，玉米与东南景天间作时，谷物中积累的重金属显著减少。间作促进了两种植物的生长。此外，无论试验中使用何种植物，植物处理后生物固体的pH值、氮磷钾浓度、发芽势和含水量均保持稳定。总之，与超富集植物间作可能是降低食用作物吸收污染物风险的有效方法。
