Evaluation of the Boron Tolerant Grass, Puccinellia distans, as an Initial Vegetative Cover for the Phytorestoration of a Boron-Contaminated Mining Site in Southern California

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• 作者：Amanda R. Stiles ; Chunguang Liu ; Yuriko Kayama ; Josephine Wong ; Harvey Doner ; Roger Funston ; Norman Terry
• 刊名：Environmental Science & Technology
• 出版年：2011
• 出版时间：October 15, 2011
• 年：2011
• 卷：45
• 期：20
• 页码：8922-8927
• 全文大小：869K
• 年卷期：v.45,no.20(October 15, 2011)
• ISSN：1520-5851

文摘

Land damaged by boron (B) mining should be restored to its natural state with a zero net impact on biodiversity. In an earlier study (Environ. Sci. Technol.<b>2010,b>44, 7089鈥?095), we characterized a Turkish ecotype of the grass, Puccinellia distans, which exhibited extreme tolerance to B. Here we evaluated the use of a US ecotype of P. distans as an initial vegetative cover for the phytorestoration of a B mine in southern California. Hydroponic studies revealed that this P. distans ecotype tolerated B concentrations >100 mg B/L and could be germinated and grown in B-contaminated soils taken from the sites to be restored. P. distans grew well in moderately B-contaminated soil (88 mg B/L saturated extract) amended with added organic matter (peat moss); other soil treatments such as gypsum addition or pH correction were not needed. P. distans also grew in severely B-contaminated soil (1506 mg B/L) provided that toxic levels of soil B were diluted by the addition of sand and/or organic matter. Our results provide evidence in support of the concept of using the US ecotype of P. distans as an initial vegetative cover for the phytorestoration of B-contaminated soil.