Fu Qing-Long, Weng Nanyan, Fujii Manabu, Zhou Dong-Mei
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China; Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Ookayama, Meguroku, Tokyo 152-8552, Japan.
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China; HKUST-Shenzhen Research Institute, Shenzhen, 518057, PR China.
Chemosphere. 2018 Mar;194:285-296. doi: 10.1016/j.chemosphere.2017.11.183. Epub 2017 Dec 1.
Global warming has obtained increasing attentions due to its multiple impacts on agro-ecosystem. However, limited efforts had been devoted to reveal the temporal variability of metal speciation and phytotoxicity of heavy metal-polluted soils affected by elevated temperature under the global warming scenario. In this study, effects of elevated temperature (15 °C, 25 °C, and 35 °C) on the physicochemical properties, microbial metabolic activities, and phytotoxicity of three Cu-polluted soils were investigated by a laboratory incubation study. Soil physicochemical properties were observed to be significantly altered by elevated temperature with the degree of temperature effect varying in soil types and incubation time. The Biolog and enzymatic tests demonstrated that soil microbial activities were mainly controlled and decreased with increasing incubation temperature. Moreover, plant assays confirmed that the phytotoxicity and Cu uptake by wheat roots were highly dependent on soil types but less affected by incubation temperature. Overall, the findings in this study have highlighted the importance of soil types to better understand the temperature-dependent alternation of soil properties, Cu speciation and bioavailability, as well as phytotoxicity of Cu-polluted soils under global warming scenario. The present study also suggests the necessary of investigating effects of soil types on the transport and accumulation of toxic elements in soil-crop systems under global warming scenario.
全球变暖因其对农业生态系统的多重影响而受到越来越多的关注。然而，在全球变暖情景下，揭示温度升高对重金属污染土壤中金属形态的时间变异性和植物毒性的研究却很少。在本研究中，通过实验室培养试验，研究了高温（15℃、25℃和35℃）对三种铜污染土壤的理化性质、微生物代谢活性和植物毒性的影响。结果表明，高温显著改变了土壤的理化性质，温度效应的程度因土壤类型和培养时间而异。Biolog和酶活性测试表明，土壤微生物活性主要受培养温度的控制，并随培养温度的升高而降低。此外，植物试验证实，小麦根系的植物毒性和铜吸收高度依赖于土壤类型，但受培养温度的影响较小。总体而言，本研究结果强调了土壤类型对于更好地理解全球变暖情景下铜污染土壤的性质、铜形态和生物有效性以及植物毒性随温度变化的重要性。本研究还表明，有必要研究全球变暖情景下土壤类型对土壤-作物系统中有毒元素迁移和积累的影响。
