Soil acidification increases metal extractability and bioavailability in old orchard soils of Northeast Jiaodong Peninsula in China.
Soil acidification increases metal extractability and bioavailability in old orchard soils of Northeast Jiaodong Peninsula in China.
复制标题
DOI：
10.1016/j.envpol.2014.02.003
复制
发表时间：
2014-05
影响因子：
8.9
通讯作者：
Lianzhen Li;Huifeng Wu;C. V. van Gestel;W. Peijnenburg;H. Allen
中科院分区：
文献类型：
--
作者：
Lianzhen Li;Huifeng Wu;C. V. van Gestel;W. Peijnenburg;H. Allen
采用蚯蚓生物测定法和化学测定法，对胶东半岛东北某果园田间土壤中Cu、Zn、Pb和Cd的生物有效性进行了评价。土壤酸度随果实栽培期的延长而增加，pH最低为4.34。经过几十年的园艺栽培，表层土壤中金属含量丰富，老苹果园中Cu （132 kg−1）和Zn （168 mg kg−1）含量最高，葡萄园土壤中Pb （73 mg kg−1）和Cd （0.57 mg kg−1）含量最高。蚯蚓组织中Cu和Pb浓度与0.01 M cacl2可提取土壤浓度呈极显著相关（R2= 0.70,p< 0.001;R2= 0.58,p< 0.01）。由于生物利用度增加，建议定期监测老果园和葡萄园的土壤状况，并需要重新评估土壤金属准则，以便在酸化条件下提供适当的环境保护。
The bioavailability of Cu, Zn, Pb and Cd from field-aged orchard soils in a certified fruit plantation area of the Northeast Jiaodong Peninsula in China was assessed using bioassays with earthworms (Eisenia fetida) and chemical assays. Soil acidity increased with increasing fruit cultivation periods with a lowest pH of 4.34. Metals were enriched in topsoils after decades of horticultural cultivation, with highest concentrations of Cu (132 kg−1) and Zn (168 mg kg−1) in old apple orchards and Pb (73 mg kg−1) and Cd (0.57 mg kg−1) in vineyard soil. Earthworm tissue concentrations of Cu and Pb significantly correlated with 0.01 M CaCl2-extractable soil concentrations (R2= 0.70,p< 0.001 for Cu;R2= 0.58,p< 0.01 for Pb). Because of the increased bioavailability, regular monitoring of soil conditions in old orchards and vineyards is recommended, and soil metal guidelines need reevaluation to afford appropriate environmental protection under acidifying conditions.