Key Laboratory of Pollution Ecology and Environment Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
College of Biological Science & Engineering, Shaanxi Province Key Laboratory of Bio-resources, Shaanxi University of Technology, Hanzhong, 723001, China.
J Hazard Mater. 2020 Jul 5;393:122482. doi: 10.1016/j.jhazmat.2020.122482. Epub 2020 Mar 5.
Differently from the goal of fertilization in agricultural production to enhance the yield of seeds, the aim of present work focused on cadmium (Cd) phytoremediation is to increase the stem and leaf biomasses as much as possible due to they are the main organs of a hyperaccumulator extracting risk elements from soil. This experiment compared the effects of different nitrogen (N) application modes on Cd accumulation from soil by Solanum nigrum L. The results showed that stem and leaf biomasses of S. nigrum reached the maximum values with the N fertilizer application at Mode 4 (50 %: 40 %: 10 %, i.e. the front-heavy and back-light application of nitrogen fertilizer). In particular, application of N as (NH)SO and CHNO produced the greatest increases in S. nigrum biomasses compared to the control (CK) with no N fertilizer. N concentration of S. nigrum and N fertilizer productivity under its different treatments were consistent with the above results. Similarly, Cd capacities were the highest in shoots of S. nigrum in Mode 4 either due to their Cd concentration without affected by N fertilizers. Thus, Mode 4 N application showed very important scientific merit for effective Cd phytoextraction in the real conditions.
与农业生产中为提高种子产量而进行受精的目的不同，本研究工作的目的是通过增加茎和叶的生物量来进行镉（Cd）的植物修复，因为这些器官是从土壤中提取风险元素的超积累植物的主要器官。本实验比较了不同氮（N）施用量模式对龙葵（Solanum nigrum L.）从土壤中吸收 Cd 的影响。结果表明，在模式 4（50%：40%：10%，即氮肥前重后轻的施用量）下，龙葵的茎和叶生物量达到最大值。特别是与不施氮肥的对照（CK）相比，施（NH）SO 和 CHNO 作为氮肥可使龙葵生物量增加最大。龙葵的氮浓度和不同处理下的氮肥生产力与上述结果一致。同样，由于氮的作用不受影响，模式 4 中龙葵地上部的 Cd 含量最高，因此其 Cd 容量也最高。因此，模式 4 的氮素施用量在实际条件下对有效进行 Cd 植物提取具有非常重要的科学意义。
