Soil acidification increases metal extractability and bioavailability in old orchard soils of Northeast Jiaodong Peninsula in China

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• 作者：Lianzhen Li^a ; Huifeng Wu^a ; ^{hfwu@yic.a.cn" class="auth_mail} ; Cornelis A.M. van Gestel^b ; ^{kees.van.gestel@vu.nl" class="auth_mail} ; Willie J.G.M. Peijnenburg^c ; ^d ; Herbert E. Allen^e
• 关键词：Soil acidification ; Orchard ; Vineyard ; Metal bioavailability ; Earthworm
• 刊名：Environmental Pollution
• 出版年：May, 2014
• 年：2014
• 卷：188
• 期：Complete
• 页码：144-152
• 全文大小：552 K

文摘

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聽kg^鈭?) and Zn (168聽mg聽kg^鈭?) in old apple orchards and Pb (73聽mg聽kg^鈭?) and Cd (0.57聽mg聽kg^鈭?) in vineyard soil. Earthworm tissue concentrations of Cu and Pb significantly correlated with 0.01聽M CaCl₂-extractable soil concentrations (R²聽=聽0.70, p聽<聽0.001 for Cu; R²聽=聽0.58, p聽<聽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.