Guo Jun-Mei, Yang Jun-Xing, Yang Jun, Zheng Guo-di, Zhou Xiao-Yong, Chen Tong-Bin, Bian Jian-Lin, Meng Xiao-Fei, Li Yu-Feng
Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Huan Jing Ke Xue. 2020 Sep 8;41(9):4226-4233. doi: 10.13227/j.hjkx.202002199.
A field experiment with an orthogonally designed experiment L9(3) was designed to investigate the effect of different N, P, and K levels on plant growth and Cd uptake by . The results showed that the biomass of significantly increased with the N application rate. The highest dry weight in the shoot occurred in the treatments with a high level of N (337.5 kg ·hm), which was 0.86-2.00 times higher than the value with no fertilizer treatment. The addition of K contributed to promoting the Cd absorption of , while no effect was observed when N and P were added. Consequently, NPK fertilizers contribute to increasing the Cd uptake of , and the N and K fertilizer play important role in plant growth and Cd absorption respectively. Moreover, the effect of fertilizers on Cd uptake of was in the order of N > K > P, which indicated that N fertilizer was the main factor for promoting the Cd phytoextraction efficiency of by increasing the biomass. Therefore, the application of high levels of N combined with moderate levels of P and K will be an effective approach to improve the Cd phytoremediation efficiency of by promoting its growth, and the Cd uptake can be increased by a factor of 0.9-2.2 compared to no fertilizer treatment condition.
设计了一个采用正交设计实验L9(3)的田间试验，以研究不同氮、磷、钾水平对植物生长及[植物名称未给出]对镉吸收的影响。结果表明，[植物名称未给出]的生物量随施氮量显著增加。地上部最高干重出现在高氮水平（337.5 kg·hm）处理中，比不施肥处理的值高0.86 - 2.00倍。钾的添加有助于促进[植物名称未给出]对镉的吸收，而添加氮和磷时未观察到影响。因此，氮磷钾肥料有助于增加[植物名称未给出]对镉的吸收，氮和钾肥料分别在植物生长和镉吸收中起重要作用。此外，肥料对[植物名称未给出]镉吸收的影响顺序为氮>钾>磷，这表明氮肥是通过增加生物量来提高[植物名称未给出]镉植物提取效率的主要因素。因此，施用高氮并结合适量的磷和钾将是通过促进[植物名称未给出]生长来提高其镉植物修复效率的有效方法，与不施肥处理条件相比，镉吸收量可增加0.9 - 2.2倍。
