Arnamwong Suteera, Wu Longhua, Hu Pengjie, Yuan Cheng, Thiravetyan Paitip, Luo Yongming, Christie Peter
a School of Bioresources and Technology, King Mongkut's University of Technology Thonburi , Bangkok , Thailand.
Int J Phytoremediation. 2015;17(1-6):382-90. doi: 10.1080/15226514.2014.910169.
Cadmium (Cd) and zinc (Zn) phytoavailability and their phytoextraction by Sedum plumbizincicola using different nitrogen fertilizers, nitrification inhibitor (dicyandiamide, DCD) and urease inhibitor (N-(n-Butyl) thiophosphoric triamide, NBPT) were investigated in pot experiments where the soil was contaminated with 0.99 mg kg(-1) of Cd and 241 mg kg(-1) Zn. The soil solution pH varied between 7.30 and 8.25 during plant growth which was little affected by the type of N fertilizer. The (NH4)2SO4+DCD treatment produced higher NH4+-N concentrations in soil solution than the (NH4)2SO4 and NaNO3 treatment which indicated that DCD addition inhibited the nitrification process. Shoot Cd and Zn concentrations across all treatments showed ranges of 52.9-88.3 and 2691-4276 mg kg(-1), respectively. The (NH4)2SO4+DCD treatment produced slightly higher but not significant Cd and Zn concentrations in the xylem sap than the NaNO3 treatment. Plant shoots grown with NaNO3 had higher Cd concentrations than (NH4)2SO4+DCD treatment at 24.0 and 15.4 mg kg(-1), respectively. N fertilizer application had no significant effect on shoot dry biomass. Total Cd uptake in the urea+DCD treatment was higher than in the control, urea+NBPT, urea+NBPT+DCD, or urea treatments, by about 17.5, 23.3, 10.7, and 25.1%, respectively.
在盆栽试验中，研究了土壤中镉（Cd）和锌（Zn）的植物有效性以及东南景天对它们的植物提取作用，该土壤被0.99 mg kg⁻¹的Cd和241 mg kg⁻¹的Zn污染，试验使用了不同的氮肥、硝化抑制剂（双氰胺，DCD）和脲酶抑制剂（N-(正丁基)硫代磷酸三酰胺，NBPT）。在植物生长期间，土壤溶液pH值在7.30至8.25之间变化，受氮肥类型的影响较小。(NH₄)₂SO₄ + DCD处理使土壤溶液中的NH₄⁺-N浓度高于(NH₄)₂SO₄和NaNO₃处理，这表明添加DCD抑制了硝化过程。所有处理的地上部Cd和Zn浓度范围分别为52.9 - 88.3和2691 - 4276 mg kg⁻¹。(NH₄)₂SO₄ + DCD处理使木质部汁液中的Cd和Zn浓度略高于NaNO₃处理，但差异不显著。用NaNO₃培养的植物地上部Cd浓度分别比(NH₄)₂SO₄ + DCD处理高24.0和15.4 mg kg⁻¹。施用氮肥对地上部干生物量没有显著影响。尿素 + DCD处理中的总Cd吸收量分别比对照、尿素 + NBPT、尿素 + NBPT + DCD或尿素处理高约17.5%、23.3%、10.7%和25.1%。
