Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
Sci Total Environ. 2017 Dec 1;599-600:1867-1873. doi: 10.1016/j.scitotenv.2017.05.150. Epub 2017 May 21.
Heavy-metal-contaminated soil threatens human health and environmental safety. Complete remediation of contaminated soil is expensive; therefore, phytomanagement has emerged as a cost-effective alternative. The current study investigated mulberry tree (Morus alba) plantation, silkworm cultivation, and silk production as phytomanagement options. Results defined the safety of planting mulberry trees in soils with lead (Pb) and arsenic (As) concentrations lower than 369 and 180mgkg, respectively. Silkworms fed with mulberry leaves collected from slightly contaminated soil exhibited productive growth and normal silk production. The silk, silkworm chrysalis, and silkworm fecal matter reached the national standards for textiles, feed, and agricultural sludge, respectively. Based on risk assessment, planting mulberry trees instead of rice significantly decreased the human health risk from contaminated soil. The total carcinogenic risk (Risk) and noncarcinogenic risk (HQ) derived from mulberry tree plantation and textile production were 2.4×10 and 6.7×10, respectively, whereas those derived from rice plantation and ingestion were 0.44 and 18.4, respectively. Cost-benefit analysis showed that a mulberry tree plantation can yield $25,675 for every 1ha soil, whereas a rice plantation can yield $8409 for the same area. Moreover, phytoextraction requires $50,000-$150,000 to remediate 1ha of soil. Therefore, constructing a mulberry tree plantation with silkworm culture and silk production is a safe means to utilize slightly contaminated soil.
重金属污染土壤威胁着人类健康和环境安全。受污染土壤的完全修复代价高昂，因此，植物管理已成为一种具有成本效益的替代方法。本研究调查了桑树（Morus alba）种植园、蚕的养殖和丝绸生产作为植物管理的选择。结果确定了在铅（Pb）和砷（As）浓度分别低于 369 和 180mgkg 的土壤中种植桑树的安全性。用取自轻度污染土壤的桑叶喂养的蚕表现出了生产性生长和正常的丝绸生产。丝绸、蚕蛹和蚕粪分别达到了纺织品、饲料和农业污泥的国家标准。基于风险评估，种植桑树而不是水稻可显著降低受污染土壤对人类健康的风险。桑树种植园和纺织生产所带来的总致癌风险（Risk）和非致癌风险（HQ）分别为 2.4×10 和 6.7×10，而水稻种植园和摄入所带来的风险分别为 0.44 和 18.4。成本效益分析表明，每公顷土壤种植桑树可产生 25675 美元的收益，而种植水稻的收益为每公顷 8409 美元。此外，植物提取修复每公顷土壤需要花费 5 万至 15 万美元。因此，构建一个集桑树种植园、蚕的养殖和丝绸生产于一体的项目，是利用轻度污染土壤的安全手段。
