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Leaf aging effects on copper and cadmium transfer along the lettuce-snail food chain

Leaf aging effects on copper and cadmium transfer along the ...

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中国土壤学会土壤环境专业委员会第二十次会议暨农田土壤污染与修复研讨会

作者： Yi-Min Wang Hui Zhang Yu-Ting Xiong Qian Zhu Yu-Chen Ding Shuai Zhao Xiao-Hui Zhang minori Uchimiya Xu-Yin Yuan Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of Education College of Environment Hohai University

Metal bioavailability at root plasma membrane surfaces and chemical forms within cells putatively controls the trophic transfer processes. Accumulation and distribution of Cu or Cd in lettuce were investigated as a function of lettuce leaf aging through soil-solution culture experiments. Metal contents in snail tissues were examined after fed on young(interior) or old(exterior) age leaves for 15 d, respectively. In both roots and leaves, Cu accumulation was higher than Cd by 3-90 fold. Young leaves accumulated more Cu than the old leaves, while higher Cu contents are found in snail tissues fed on old leaves. Opposite trends were observed for Cd. Copper as an essential element had a higher transfer factor(Tf) value than the non-essential element Cd in biomagnification from lettuce leaf to snail. Reasons involved in metal chemical forms within cells at different leaf ages, where higher percentages of metal in toxicity and migration associated fractions(fi: inorganic form, fii: water-soluble form and fiii: pectate-and protein-integrated form) are found for Cu in old leaves(88.3 – 91.6%) and Cd in young leaves(86.8 – 94.5%). Metal activities at root plasma membrane surfaces({M2+}0) and chemical forms in f(i)-f(iii) linearly correlated with metal accumulation in lettuce and snail tissues(R2 > 0.900, p for snails fed on old leaves). Our study incorporated both the chemical form approach and {M2+}0 into evaluating the trophic bioavailability of different metals along the lettuce-snail chain, which is important for mechanistic understanding of metal behaviors in the ecosystem.

关键词： heavy metal leaf ages snail metal chemical forms food chain transfer

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