Wu L H, Li H, Luo Y M, Christie P
Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
Environ Geochem Health. 2004 Jun-Sep;26(2-3):331-5. doi: 10.1023/b:egah.0000039598.24033.4e.
An orthogonally designed experiment was conducted to study the single and combined effects of N, P and K on phytoremediation of Cu-polluted soil by Indian mustard. Addition of fertilizer N and P significantly increased Indian mustard shoot yield. Two high treatments combined with N resulted in the highest yields, followed by low-P combined with N. In contrast, high P with no N gave no yield increase and K had no effect on yield of Indian mustard. Nitrogen and P increased the amount of chlorophyll in the leaves, indicating that the yield increases were due to enhanced photosynthesis. Nitrogen application had no effect on plant Cu concentrations but addition of P slightly decreased plant Cu concentrations, likely a dilution effect resulting from the increase in yield. Among the treatments, N and P applied at 100 and 200 mg kg(-1) respectively with no K application resulted in the highest Cu uptake. Thus, a combination of low N and high P produced a yield increase in Indian mustard that was more than adequate to compensate for a slight decrease in Cu concentration, resulting in the highest Cu removal from the contaminated soil.
进行了一项正交设计实验，以研究氮、磷和钾对印度芥菜修复铜污染土壤的单一和联合效应。添加肥料氮和磷显著提高了印度芥菜地上部产量。两种高处理与氮结合导致产量最高，其次是低磷与氮结合。相比之下，高磷无氮处理产量未增加，钾对印度芥菜产量无影响。氮和磷增加了叶片中的叶绿素含量，表明产量增加是由于光合作用增强。施氮对植物铜浓度无影响，但添加磷会使植物铜浓度略有降低，这可能是产量增加导致的稀释效应。在各处理中，分别施用100和200 mg kg(-1)的氮和磷且不施钾的处理铜吸收量最高。因此，低氮高磷组合使印度芥菜产量增加，足以弥补铜浓度的轻微下降，从而使污染土壤中铜的去除量最高。
