Key Laboratory of Key Technologies of Digital Urban-Rural Spatial Planning of Hunan Province, College of Architecture and Urban Planning, Hunan City University, Yiyang, 413000, China.
Hunan Provincial Key Laboratory of Rural Ecosystem Health in Dongting Lake Area, College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China.
Chemosphere. 2020 Aug;252:126512. doi: 10.1016/j.chemosphere.2020.126512. Epub 2020 Mar 17.
Hydroponic experiments with different cadmium (Cd) concentrations were conducted to explore the impacts of nutrient allocation on the Cd enrichment of Bermuda grass. The results demonstrated with the Cd concentration increase, the accumulation of nitrogen (N), phosphorus (P) and potassium (K) in roots, stems and leaves increased first and then decreased, while the accumulation of Cd had no significant difference. The biomass and N, P and K accumulation of CD1 and CD2 were significantly different from those of CD3 and CD4, but there was no significant difference in Cd accumulation. The root N, P and K distribution ratio of CD4 increased by 47.9%, 114.3% and 64.3% compared with those of CD2 treatment, the values of stem decreased by 29.4%, 22.4% and 17.2%, and the values of leaves increased by 15.8%, 19.8% and 23.6% respectively. The K ratio of root and leaf increased and that of stem decreased. Cd reduced N and K distribution ratio of stem and increased N and K distribution ratio of root and leaf. Pearson correlation analysis showed that the accumulation of N, P and K in stems was positively correlated with the accumulation of Cd in stems, and the accumulation of N, P and K in roots, stems and leaves were positively correlated with the Cd accumulation in leaves. Bermuda grass can schedule the nutrient allocation to adapt to the Cd absorption and enrichment in different organs under different Cd concentrations. In conclusion, nutrient allocation might affect the Cd accumulation of Bermuda grass.
进行了不同镉 (Cd) 浓度的水培实验，以探讨养分分配对百慕大草 Cd 富集的影响。结果表明，随着 Cd 浓度的增加，根、茎和叶中氮（N）、磷（P）和钾（K）的积累先增加后减少，而 Cd 的积累没有显著差异。CD1 和 CD2 的生物量和 N、P 和 K 积累与 CD3 和 CD4 有显著差异，但 Cd 积累无显著差异。与 CD2 处理相比，CD4 的根 N、P 和 K 分配比例分别增加了 47.9%、114.3%和 64.3%，茎的值降低了 29.4%、22.4%和 17.2%，叶的值分别增加了 15.8%、19.8%和 23.6%。根和叶的 K 比值增加，茎的 K 比值降低。Cd 降低了茎中 N 和 K 的分配比例，增加了根和叶中 N 和 K 的分配比例。Pearson 相关分析表明，茎中 N、P 和 K 的积累与茎中 Cd 的积累呈正相关，根、茎和叶中 N、P 和 K 的积累与叶中 Cd 的积累呈正相关。百慕大草可以调节养分分配，以适应不同 Cd 浓度下不同器官对 Cd 的吸收和富集。综上所述，养分分配可能会影响百慕大草对 Cd 的积累。
