Abstract
The use of Napier grass to remediate heavy metal-contaminated soil is a new phytoremediation technique. The objective of this study was to evaluate the ability of Napier grass (Pennisetum purpureum Schumach.) to remediate Cd- and Zn-contaminated cultivated soil under nonmowing and mowing and the possibility of safe utilization of the stem and leaf after detoxification by liquid extraction. Three Napier grass varieties, P. purpureum cv. Mott (PM), P. purpureum cv. Red (PR), and P. purpureum cv. Guiminyin (PG), were planted in a field with 3.74 mg kg−1 Cd and 321.26 mg kg−1 Zn for 180 days. The maximum amounts of Cd and Zn removed by PG were 197.5 and 5023.9 g ha−1, respectively, almost equaling those of hyperaccumulators. Compared with nonmowing, mowing did not decrease the Cd and Zn contents in various tissues but increased the biomasses of PM, PR, and PG by 86.6%, 18.9%, and 26.1%, respectively. Compared with nonmowing, the amounts of Cd removed by PM, PR, and PG under mowing increased by 110.5%, 40.0%, and 107.9%, respectively, and that of Zn increased by 63.0%, 53.1%, and 71.6%. The dominant Cd and Zn chemical fractions in Napier grass were the pectate- and protein-integrated fractions. After liquid extraction, although the nutrient element (Ca, K, Mg, and Mn) contents in the stem and leaf were reduced significantly, the Cd and Zn contents decreased below the limit of the Chinese Hygienic Standard for Feeds, and the crude protein content was largely retained. Such detoxified stems and leaves can be safely used as feeds or as raw materials for energy production.
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This work was funded by the National Key Research and Development Program of China (No. 2017YFD0801105) and Central Public-Interest Scientific Institution Basal Research Fund (No. Y2018LM18).
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Yang, WJ., Gu, JF., Zhou, H. et al. Effect of three Napier grass varieties on phytoextraction of Cd- and Zn-contaminated cultivated soil under mowing and their safe utilization. Environ Sci Pollut Res 27, 16134–16144 (2020). https://doi.org/10.1007/s11356-020-07887-1
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DOI: https://doi.org/10.1007/s11356-020-07887-1