School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China; Danzhou Soil Environment of Rubber Plantation, Hainan Observation and Research Station, Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou, Hainan 571737, China.
Danzhou Soil Environment of Rubber Plantation, Hainan Observation and Research Station, Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou, Hainan 571737, China.
J Hazard Mater. 2024 May 5;469:133903. doi: 10.1016/j.jhazmat.2024.133903. Epub 2024 Feb 27.
Biochar, an environmentally friendly material, was found to passivate lead (Pb) in contaminated soil effectively. This study utilized spectroscopic investigations and partial least squares path modeling (PLS-PM) analysis to examine the impact of coconut-fiber biochar (CFB) on the translocation, accumulation, and detoxification mechanisms of Pb in soil-rice systems. The results demonstrated a significant decrease (p < 0.05) in bioavailable Pb concentration in paddy soils with CFB amendment, as well as reduced Pb concentrations in rice roots, shoots, and brown rice. Synchrotron-based micro X-ray fluorescence analyses revealed that CFB application inhibited the migration of Pb to the rhizospheric soil region, leading to reduced Pb uptake by rice roots. Additionally, the CFB treatment decreased Pb concentrations in the cellular protoplasm of both roots and shoots, and enhanced the activity of antioxidant enzymes in rice plants, improving their Pb stress tolerance. PLS-PM analyses quantified the effects of CFB on the accumulation and detoxification pathways of Pb in the soil-rice system. Understanding how biochar influences the immobilization and detoxification of Pb in soil-rice systems could provide valuable insights for strategically using biochar to address hazardous elements in complex agricultural settings.
生物炭是一种环境友好型材料，被发现能有效地使污染土壤中的铅（Pb）钝化。本研究利用光谱研究和偏最小二乘路径建模（PLS-PM）分析，研究了椰壳纤维生物炭（CFB）对土壤-水稻系统中 Pb 的迁移、积累和解毒机制的影响。结果表明，CFB 改良剂可显著降低（p<0.05）水田中生物可利用 Pb 的浓度，以及降低水稻根、茎和糙米中的 Pb 浓度。基于同步加速器的微 X 射线荧光分析表明，CFB 的应用抑制了 Pb 向根际土壤区域的迁移，从而减少了水稻根对 Pb 的吸收。此外，CFB 处理降低了根和茎细胞质中的 Pb 浓度，并增强了水稻植株中的抗氧化酶活性，提高了其对 Pb 胁迫的耐受性。PLS-PM 分析量化了 CFB 对土壤-水稻系统中 Pb 积累和解毒途径的影响。了解生物炭如何影响土壤-水稻系统中 Pb 的固定和解毒，可为在复杂农业环境中策略性地利用生物炭来解决有害元素提供有价值的见解。
