• 中文核心期刊
  • CSCD来源期刊
  • 中国科技核心期刊
  • CA、CABI、ZR收录期刊

平和典型蜜柚果园土壤铜分布及与果树铜累积关系

Cu Distribution in Soil and Cu Accumulation in Pomelo Plants at Typical Pomelo Orchards in Pinghe County

  • 摘要: 对福建省漳州市平和县琯溪蜜柚13个典型果园土壤剖面样品铜含量进行研究,结果表明平和蜜柚典型果园土壤上层铜全量空间变异性较强,变异程度高于中层和下层铜全量;土壤上层铜全量平均值高于土壤中层和下层,分别为35.28、15.60和13.85 mg·kg-1;土壤上层铜全量平均值高于福建省土壤平均背景值(21.6 mg·kg-1),23.1%样地果园土壤铜全量超过《土壤环境质量标准》二级标准(50 mg·kg-1)。大多果园土壤剖面铜赋存形态主要是残渣态,而在含量较高的样地,上层土壤残渣态铜比例明显低于中层和下层土壤。土壤铜全量对铜形态分布影响最大,全量越高,活性最高的弱酸可提取态越高。土壤3个剖面铜全量与叶片和枝条铜含量均显著正相关,各剖面土壤弱酸可提取态铜含量与叶片和枝条铜含量间亦呈现显著正相关关系。由此表明平和蜜柚果园土壤铜上层出现富集,部分果园铜污染严重,应引起足够重视。

     

    Abstract: Chemical speciation and concentrations of Cu in different layers of soil samples collected from 13 typical pomelo orchards in Pinghe, Zhangzhou, Fujian were determined based on the BCR sequential chemical extractions for an assessment on Cu pollution. The results showed that the mean Cu contents in three soil layers were 35.28, 15.60, and 13.85 mg·kg-1. Besides being most variable, the surface layer also contained the highest amount of Cu which exceeded the provincial reference value. Of all samples, 23.1% showed Cu content higher than the standard Ⅱ for soil quality. Most of the soils contained Cu mainly in the form of residues.The proportion of residual phase in the surface layer was lower than in the deeper layers in the samples with high Cu content. Total Cu in soil affected the chemical speciation the greatest among all factors considered; and, the greater the content, the more acid extractable Cu in the sample. Soil Cu also affected Cu accumulation in the pomelo plants that grew on the lot. There was a significant correlation between the Cu content in pomel oleaves and stems and that in the orchard soil, as well as between that and the acid extractable Cu in various soil layers. Thus, the issues of high Cu in the surface soil and the severe pollution at certain pomelo orchards found in the areas should be adequately addressed.

     

/

返回文章
返回