Rhizosphere characteristics of Pb phytostabilizer Athyrium wardii (Hook.) involved in Pb accumulation

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• 作者：Li Zhao ; Tingxuan Li ; Xizhou Zhang ; Guangdeng Chen…
• 关键词：Athyrium wardii ; Rhizosphere ; pH ; DOC ; Pb fraction ; Microorganism
• 刊名：Environmental Earth Sciences
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：75
• 期：6
• 全文大小：442 KB
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• 作者单位：Li Zhao (1)
  Tingxuan Li (1)
  Xizhou Zhang (1)
  Guangdeng Chen (1)
  Zicheng Zheng (1)
  Haiying Yu (1)
  
  1. College of Resources and Environmental Science, Sichuan Agricultural University, 211 Huimin Road, Chengdu, 611130, Sichuan, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

A pot experiment was conducted to evaluate the rhizosphere characteristics of the mining ecotype (ME) of Athyrium wardii and the non-mining ecotype (NME) with rhizobags when exposed to Pb-contaminated soils for 40 days. The results showed that the ME was more tolerant to Pb and more efficient in Pb uptake than the NME. Available Pb concentrations in the rhizosphere of ME and NME increased by 1.2–2.3 times and 1.7–2.7 times when compared to those in the bulk soil, whereas available Pb concentrations in rhizosphere of ME were lower than those of NME. Significant depletion of exchangeable Pb, Pb bound to carbonate and Pb bound to organic matter was observed in the rhizosphere of ME. No statistical change of Pb bound to Fe–Mn oxides was observed in the rhizosphere of both ecotypes. pH values in the rhizosphere of ME decreased by 0.02–0.16 units compared to the bulk soil, and the dissolved organic carbon concentrations in the rhizosphere of ME were 1.1–1.5 times higher than those in the bulk soil. Microorganism numbers in rhizosphere of both ecotypes reduced with increasing Pb treatments, and the sensitivity order of microbial community to Pb was: bacteria > fungi > actinomycetes. Microorganism number in the rhizosphere of ME was higher than that of NME and bulk soil. In conclusion, the ME was more effective in Pb uptake and showed greater capability in mobilizing Pb from non-mobile fraction to mobile fractions likely due to its specific rhizosphere characteristics.