Soil amendments, plant age, and intercropping impact p,p′-DDE bioavailability to Cucurbita pepo
Soil amendments, plant age, and intercropping impact p,p′-DDE bioavailability to Cucurbita pepo
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DOI：
10.2134/jeq2005.0271
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发表时间：
2006-07-01
影响因子：
2.4
通讯作者：
Mattina, MaryJane Incorvia
中科院分区：
文献类型：
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作者：
White, Jason C.;Parrish, Zakia D.;Mattina, MaryJane Incorvia
通过田间试验优化了南瓜亚种对风化pp '-DDE（pp'-dichlorodiphenylidichloroethylene）的植物提取工艺。测定了两种土壤改良剂（真菌素或生物表面活性剂）对pp '-DDE累积的影响。此外，在植物生长（12，26，38，和62天），和积累风化的pp '-DDE的品种与已知的品种没有这种能力间作的pp'-DDE吸收进行了评估。西葫芦SSP. pepo积累了大量的污染物，其茎生物富集因子、pp '-DDE的转移量和污染物的植物提取量分别是C.的14、9.9和5.0倍。胡椒属SSP. ovifera（L.）D.S.德克尔。在62 d内，pepo亚种茎对pp '-DDE的生物富集系数（BCF）保持不变，污染物累积总量与植物生物量相关（r（2）= 0.86）。对于ovifera亚种，茎BCF在12 d时最高（1.5），但在62 d时降至0.39，pp '-DDE去除与植物生物量无关。菌根接种增加pp '-DDE积累的两个亚种的平均4.4倍。对于亚种pepo，真菌毒素使提取的污染物的百分比从0.72%增加到2.1%。生物表面活性剂修正案也增强了污染物积累的两个亚种，虽然治疗减少亚种ovifera生物量的60%。生物表面活性剂没有影响的亚种pepo的生物量，增加了3.6倍的平均污染物浓度，并增加了一倍的pp '-DDE从土壤中去除的总量。土壤改良剂，提高风化的持久性有机污染物的流动性，将显着增加污染物的植物提取西葫芦的量。
Field experiments were conducted to optimize the phytoextraction of weathered pp'-DDE (pp'-dichlorodiphenyidichloroethylene) by Cucurbita subspecies. The effects of two soil amendments, mycorrhizae or a biosurfactant, on pp'-DDE accumulation was determined. Also, pp'-DDE uptake was assessed during plant growth (12, 26, 38, and 62 d), and cultivars that accumulate weathered pp'-DDE were intercropped with cultivars known not to have that ability. Cucurbita pepo L. ssp. pepo accumulated large amounts of the contaminant, having stem bioconcentration factors, amounts of pp'-DDE translocated, and contaminant phytoextraction that were 14, 9.9, and 5.0 times greater than C. pepo L. ssp. ovifera (L.) D.S. Decker, respectively. During 62 d, the stem BCF (bioconcentration factor) for pp'-DDE in subspecies pepo remained constant and the total amount of contaminant accumulated was correlated with plant biomass (r(2) = 0.86). For subspecies ovifera, the stem BCF was highest at 12 d (1.5) but decreased to 0.39 by 62 d, and pp'-DDE removal was not correlated with plant biomass. Mycorrhizal inoculation increased pp'-DDE accumulation by both subspecies by an average 4.4 times. For subspecies pepo, mycorrhizae increased the percentage of contaminant extracted from 0.72 to 2.1%. Biosurfactant amendment also enhanced contaminant accumulation by both subspecies, although treatment reduced subspecies ovifera biomass by 60%. The biosurfactant had no effect on the biomass of subspecies pepo, increased the average contaminant concentration by 3.6-fold, and doubled the overall amount of pp'-DDE removed from the soil. Soil amendments that enhance the mobility of weathered persistent organic pollutants will significantly increase the amount of contaminant phytoextraction by Cucurbita pepo.