施用堆肥有机肥对污染农田土壤中锑的固定和植物可利用性的影响。
Immobilization and phytoavailability of antimony (Sb) in contaminated agricultural soils amended with composted manure.
机构信息
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, No. 19 Xinjiekouwai Street, Beijing 100875, China.
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, No. 19 Xinjiekouwai Street, Beijing 100875, China; Instrumentation and Service Center for Science and Technology, Beijing Normal University, Zhuhai 519087, China.
出版信息
Sci Total Environ. 2023 Jan 15;856(Pt 2):159213. doi: 10.1016/j.scitotenv.2022.159213. Epub 2022 Oct 4.
A pot experiment was conducted to assess the Sb phytoavailability and its accumulation in the wheat before and after remediation, using the composted manure of poultry and sheep, and a chemical amendment (limestone). The present study evaluates the effects of amendments on Sb bioavailability in different soils and investigates the relationship between bioaccumulated Sb and its availability in spiked soils using two different single extraction methods. Furthermore, a sequential extraction procedure was used to measure different fractions of Sb in soil, in order to assess the effect of remediation. The results revealed that bioavailability of Sb were highly affected by the three soil amendments on plant height, uptake of Sb by wheat. Poultry compost (Pc) and Sheep compost (Sc) increased the residual fraction of Sb in soils, and decreased the Sb uptake by wheat, enhanced the height, biomass and dry yield of the wheat crop. While the residual fraction of Sb in soils didn't obviously increased by adding Chemical (limestone) in the four soils. It is concluded that uptake of Sb in the soils significantly decreased with the addition of amended materials in the Sb spiked soils, and poultry compost is the most effective. In the lower level of Sb contaminated soils remediated by poultry compost (Pc), the uptake of Sb in wheat decreased 63.1-74.4 %, 68.7-79.0 %, 68.9-76.9 % and 66.3-82.6 % in S1, S2, S3, S4, compared to the contaminated soils without amendments, respectively.
采用盆栽试验研究了鸡粪、羊粪堆肥和化学改良剂（石灰）对污染土壤中 Sb 形态及其在小麦植株体内迁移的影响。采用两种不同的单提取方法评价了改良剂对不同土壤中 Sb 生物有效性的影响，并探讨了污染土壤中 Sb 生物有效性与其可提取性之间的关系。同时，采用连续提取法对土壤中 Sb 的不同赋存形态进行了分析，以评价修复效果。结果表明，三种土壤改良剂对植株高度和 Sb 吸收均有显著影响。鸡粪（Pc）和羊粪（Sc）增加了土壤中 Sb 的残渣态含量，降低了 Sb 的植物有效性，从而减少了小麦对 Sb 的吸收，同时提高了小麦的株高、生物量和干重。而在四种土壤中添加石灰并没有明显增加土壤中 Sb 的残渣态含量。因此，在 Sb 污染土壤中添加改良剂可以显著降低 Sb 的植物有效性，其中鸡粪的效果最为显著。在 Sb 污染土壤经鸡粪改良后，小麦对 Sb 的吸收量分别降低了 63.1%-74.4%、68.7%-79.0%、68.9%-76.9%和 66.3%-82.6%，而未经改良的污染土壤中，小麦对 Sb 的吸收量分别为 S1、S2、S3 和 S4。
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