Military activities can contaminate productive land with potentially toxic substances. The most common trace metal contaminant on military bases is lead (Pb). A field experiment was begun in 2016 at Fort Riley, KS, in an area with total soil Pb concentrations ranging from 900 to 1,500 mg kg^–1 and near-neutral pH. The main objectives were to test the potential of Miscanthus sp. for phytostabilization of the site and to evaluate the effects of soil amendments on Miscanthus growth, soil–plant Pb transfer, bioaccessibility of soil Pb, and soil health. The experimental design was a randomized complete block, with five treatments and four replications. Treatments were (a) existing vegetation; (b) Miscanthus planted in untilled soil, no amendments; (c) Miscanthus planted in tilled soil; (d) Miscanthus planted in tilled soil amended with inorganic P (triple superphosphate applied at 5:3 Pb:P); and (e) Miscanthus planted in tilled soil amended with organic P (Class B biosolids applied at 45 Mg ha^–1). Tilling and soil amendments increased dry matter yields only in the establishment year. Total Pb uptake, plant tissue Pb concentration, and soil Pb bioaccessibility were significantly less in the Miscanthus plots amended with biosolids than the Miscanthus plots with no added P across all 3 yr. Enzyme activities, organic carbon, and microbial biomass were also greater in biosolids-treated plots. Results show that planting-time addition of soil amendments to Pb-contaminated soil supported Miscanthus establishment, stabilized and reduced bioaccessibility of soil Pb, reduced concentration and uptake of Pb by Miscanthus, and enhanced soil health parameters.

中文翻译：

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使用芒草和土壤改良剂对受污染的军事场地进行植物稳定

军事活动可能会用潜在的有毒物质污染肥沃的土地。军事基地上最常见的痕量金属污染物是铅 (Pb)。一项田间试验于 2016 年在堪萨斯州莱利堡开始，该地区土壤总铅浓度范围为 900 至 1,500 mg kg ^–1，pH 值接近中性。主要目标是测试芒草的潜力。用于场地的植物稳定并评估土壤改良剂对芒草生长、土壤-植物铅转移、土壤铅的生物可及性和土壤健康的影响。实验设计为随机完整区组，有五个处理和四个重复。处理是 (a) 现有植被；(b)芒草种植在未耕种的土壤中，无需修改；(c)耕作土壤中种植的芒草；(d) 种植在用无机 P 改良的耕作土壤中的芒草（以 5:3 Pb:P 施用三重过磷酸钙）；(e)种植在用有机 P 改良的耕作土壤中的芒草（B 类生物固体，施用量为 45 Mg ha ^–1）。耕作和土壤改良仅在建立年份增加了干物质产量。在用生物固体修正的芒草地块中，总铅吸收、植物组织铅浓度和土壤铅生物可及性显着低于芒草在所有 3 年中没有添加 P 的图。在生物固体处理的地块中，酶活性、有机碳和微生物生物量也更大。结果表明，种植时向受铅污染的土壤中添加土壤改良剂支持芒草的建立，稳定并降低土壤铅的生物可及性，降低芒草对铅的浓度和吸收，并增强土壤健康参数。