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三峡库区中低产土壤重金属含量及其与小麦吸收的关系 被引量:5
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作者 魏朝富 高明 +3 位作者 车福才 欧阳柬 罗长寿 谢德体 《长江流域资源与环境》 CAS CSSCI CSCD 北大核心 2003年第2期145-152,共8页
三峡库区中低产土壤的Hg、As、Cr、Pb、Cu五个重金属含量(除渝北区外),均在国家土壤环境质量标准内,属自然背景值一级标准。Cd和Zn高于全国土壤中的平均含量和背景值含量,属二级标准。土壤的重金属含量与土壤母质类型、pH值、阳离子交... 三峡库区中低产土壤的Hg、As、Cr、Pb、Cu五个重金属含量(除渝北区外),均在国家土壤环境质量标准内,属自然背景值一级标准。Cd和Zn高于全国土壤中的平均含量和背景值含量,属二级标准。土壤的重金属含量与土壤母质类型、pH值、阳离子交换量、有机质、无定形铁和物理性粘粒有关,同时存在一定的地域分布。重庆近郊的土壤所有重金属含量相对较高。土壤重金属的可给态或有效性含量极低,锌和铜不是过量,而是不足。小麦籽粒中As、Cr、Pb、Zn、Cu含量低于国家食品对重金属限量标准和小麦籽粒的背景值标准,Hg、Cd含量高于国家规定标准。籽粒中的Cu、Zn含量是小麦茎叶中的2.0~2.2倍,而茎叶中的Hg、Pb、As、Cr、Cd含量明显高于籽粒。 展开更多
关键词 小麦吸收 三峡库区 中低产土壤 土壤重金属 小麦重金属
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Chromium(VI) Reduction in Wheat Rhizosphere 被引量:2
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作者 CHENNENGCHANG S.KANAZAWA 《Pedosphere》 SCIE CAS CSCD 2000年第1期31-36,共6页
Reduction of Cr(VI) to Cr(III) were studied in a fresh wheat rhizosphere soil (Kuroboku, high humic andosol) pretreated with a basal fertilizer consisting of (NH4)2SO4, P2O5 and KH2PO4 and with K2Cr2O7 by using a rhiz... Reduction of Cr(VI) to Cr(III) were studied in a fresh wheat rhizosphere soil (Kuroboku, high humic andosol) pretreated with a basal fertilizer consisting of (NH4)2SO4, P2O5 and KH2PO4 and with K2Cr2O7 by using a rhizobox system. It was found that rhizosphere exerted a positive effect on Cr(VI) reduction. Part of the reason was the decrease of pH in the rhizosphere due to application of (NH4)2SO4, implying that application of physiologically acid fertilizers would reduce Cr(VI) toxicity to plants. 展开更多
关键词 CR REDUCTION RHIZOSPHERE WHEAT
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Greenhouse Gas Emissions and Growth of Wheat Cultivated in Soil Amended with Digestate from Biogas Production
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作者 Liliana PAMPILLON-GONZALEZ Marco LUNA-GUIDO +5 位作者 Victor Manuel RUIZ-VALDIVIEZO Olivia FRANCO-HERNANDEZ Fabign FERNANDEZ-LUQUENO Oetavio PAREDES-LOPEZ Gerardo HERNANDEZ Luc DENDOOVEN 《Pedosphere》 SCIE CAS CSCD 2017年第2期318-327,共10页
Digestate, the product obtained after anaerobic digestion of organic waste for biogas production, is rich in plant nutrients and might be used to fertilize crops. Wheat (Triticum spp. L.) was fertilized with digesta... Digestate, the product obtained after anaerobic digestion of organic waste for biogas production, is rich in plant nutrients and might be used to fertilize crops. Wheat (Triticum spp. L.) was fertilized with digestate, urea, or left unfertilized and cultivated in the greenhouse for 120 d. Emissions of greenhouse gasses (carbon dioxide (CO2), methane (CH4), and nitrous oxide (N20)) were monitored and plant growth characteristics were determined at harvest. The digestate was characterized for heavy metals, pathogens, and C and N mineralization potential in an aerobic incubation experiment. No Salmonella spp., Shigella spp., or viable eggs of helminths were detected in the digested pig slurry, but the number of faecal coliforms was as high as 3.6 ~ 104 colony-forming units (CFU) g-1 dry digestate. The concentrations of heavy metals did not surpass the upper limits established by US Environmental Protection Agency (EPA). After 28 d, 17% of the organic C (436 g kg-1 dry digestate) and 8% of the organic N (6.92 g kg-1 dry digestate) were mineralized. Emissions of CO2 and CH4 were not significantly affected by fertilization in the wheat-cultivated soil, but digestate significantly increased the cumulative N20 emission by 5 times compared to the urea-amended soil and 63 times compared to the uncultivated unfertilized soil. It could be concluded that digestate was nutrient rich and low in heavy metals and pathogens, and did not affect emissions of CH4 and CO2 when applied to a soil cultivated with wheat, but increased emission of N20. Key Words: biodigester, C and N mineralization potential, faecal coliform, heavy metal, pathogen, pig slurry 展开更多
关键词 biodigester C and N mineralization potential faecal coliform heavy metal PATHOGEN pig slurry
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