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首页> 外文期刊>Plant and Soil >Phytoextraction of Cd and Zn from agricultural soils by Salix ssp. and intercropping of Salix caprea and Arabidopsis halleri
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Phytoextraction of Cd and Zn from agricultural soils by Salix ssp. and intercropping of Salix caprea and Arabidopsis halleri

机译：柳（Salix ssp）从农业土壤中提取镉和锌。柳和拟南芥的套种

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Contamination of agricultural topsoils with Cd above guideline values is of concern in many countries throughout the world. Extraction of metals from contaminated soils using high-biomass, metal-accumulating Salix sp. has been proposed as a low-cost, gentle remediation strategy, but reasonable phytoextraction rates remain to be demonstrated. In an outdoor pot experiment we assessed the phytoextraction potential for Cd and Zn of four willow species (Salix caprea, S. fragilis, S. x smithiana, S. x dasyclados) and intercropping of S. caprea with the hyperaccumulator Arabidopsis halleri on three moderately contaminated, agricultural soils. Large concentrations of Cd (250 mg kg-p#) and Zn (3,300 mg kg-p#) were determined in leaves of Salix x smithiana grown on a soil containing 13.4 mg kg-p# Cd and 955 mg kg-p# Zn, resulting in bioaccumulation factors of 27 (Cd) and 3 (Zn). Total removal of up to 20% Cd and 5% Zn after three vegetation periods were shown for Salix x smithiana closely followed by S. caprea, S. fragilis and S. x dasyclados. While total Cd concentrations in soils were reduced by up to 20%, 1 M NHNO-extractable metal concentrations did not significantly decrease within 3 years. Intercropping of S. caprea and A. halleri partly increased total removal of Zn, but did not enhance total Cd extraction compared to single plantings of S. caprea after two vegetation periods.
机译：Cd高于准则值的农业表层土壤污染是世界许多国家关注的问题。使用高生物量，富金属的Salix sp。从污染土壤中提取金属。已经提出将其作为低成本，温和的补救策略，但是合理的植物提取率仍有待证明。在一个室外盆栽实验中，我们评估了三种柳树（Sa柳，脆弱链霉菌，S。smithiana，S。x dasyclados）对镉和锌的植物提取潜力，以及在三个中等水平上利用高蓄积拟南芥对间链霉菌的间作作用。受污染的农业土壤。在含有13.4 mg kg-p＃Cd和955 mg kg-p＃Zn的土壤上生长的Salix x smithiana的叶子中测定了高浓度的Cd（250 mg kg-p＃）和Zn（3,300 mg kg-p＃）。 ，导致生物积累因子为27（Cd）和3（Zn）。 Salix x smithiana的三个植被期后，总去除率高达20％Cd和5％Zn，紧随其后的是S. caprea，S。fragilis和S. x dasyclados。虽然土壤中的总Cd浓度降低了20％，但1 M NHNO可萃取金属的浓度在3年内并未显着降低。与两个种植时期之后的单粒葡萄球菌相比，间作葡萄球菌和哈雷木作的间作部分增加了锌的总去除量，但并未提高总镉的提取量。

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