Plant heavy metal concentrations and soil biological properties in agricultural serpentine soils
Plant heavy metal concentrations and soil biological properties in agricultural serpentine soils
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DOI：
10.1080/00103629909370338
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发表时间：
1999-01-01
影响因子：
1.8
通讯作者：
Merino, A
中科院分区：
文献类型：
--
作者：
Fernández, S;Seoane, S;Merino, A
在蛇纹岩上发育的土壤对农业有严重的限制。它们含有高水平的镁（Mg）和重金属[铜（Cu），锰（Mn），镍（Ni）和铬（Cr）]，并且缺乏一些常量营养素。在西班牙西北部的部分地区，蛇纹岩土壤受到集约化管理，使用粪肥和收获残留物。虽然这些做法使作物生长，但植物可能积累了大量的金属。本研究旨在评价管理措施对作物吸收重金属的影响，并分析植物体内重金属含量与土壤性质之间的关系。中等水平的镍和锰和低水平的铬和铜被发现在土壤中提取的这些金属的馏分。尽管如此，植物组织的分析显示高水平的铬和镍和中等含量的锰。锰和镍在树叶中的浓度相关的土壤提取物含量，而简单的线性回归的铬在植物中的浓度和土壤提取的铬之间的关系不佳，可能是因为这种金属的可用性，铬（VI），是由时间的环境条件。为评价管理措施对植物吸收重金属的影响，在实验室条件下，以紫羊茅和匍匐翦股颖为材料，在有机质含量较低的蛇纹石土上种植，并添加泥炭和/或石灰，进行生物测定。本实验证实，有一个有机修正后，植物中的重金属浓度降低，并建议较低的金属有效性的部分原因是由于较高的土壤微生物活性，产生作为一个结果，添加有机质。
Soils developed on serpentinitic rocks have serious limitations for agriculture. They have high levels of magnesium (Mg) and heavy metals [copper (Cu), manganese (Mn), nickel (Ni), and chromium (Cr)] and are deficient in some macronutrients. In parts of Northwestern Spain, serpentine soils have been subjected to intensive management, based on the use of manure and harvesting residues. Although these practices have allowed the growth of crops, plants may have accumulated high amounts of metals. This study was carried out to assess the effect of the management practices on the uptake of heavy metals by crops, and to analyze the relationship between the concentrations of these metals in plants, and soil properties. Moderate levels of Ni and Mn and low levels of Cr and Cu were found in soil extractable fractions of these metals. In spite of this, analysis of plant tissues revealed high levels of Cr and Ni and moderate contents of Mn. Concentrations of Mn and Ni in foliage were correlated to soil extractable contents, whereas simple linear regression between concentration of Cr in plants and the soil-extractable Cr showed a poor relationship, possibly because the availability of this metal, as Cr(VI), is determined by temporal environmental conditions. To assess the effects of the management on the uptake of heavy metals by plants, a complementary bioassay experiment was carried out in the laboratory in wh ich Festuca rubra and Agrostis stolonifera were sown on serpentine soil with low organic matter content, and amended with peat and/or lime. This experiment confirmed that there is a reduction in heavy metal concentration in plants after organic amendment and suggested that the lower metal availability is partly due to the higher soil microbial activity, produced as a consequence of addition of organic matter.