The effect of biochar nanoparticles on rice plant growth and the uptake of heavy metals: Implications for agronomic benefits and potential risk
The effect of biochar nanoparticles on rice plant growth and the uptake of heavy metals: Implications for agronomic benefits and potential risk
复制标题
生物炭纳米粒子对水稻生长和重金属吸收的影响：对农艺效益和潜在风险的影响
DOI：
10.1016/j.scitotenv.2018.11.364
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发表时间：
2019
影响因子：
9.8
通讯作者：
Xing Baoshan
中科院分区：
文献类型：
--
作者：
Yue Le;Lian Fei;Han Yang;Bao Qiongli;Wang Zhengyu;Xing Baoshan
生物炭纳米颗粒（nano-BC）和植物根在根际的相互作用在很大程度上是未知的，虽然它是至关重要的了解BC在植物生长和污染物的生物利用度的作用。从生物化学变化和Cd吸收两方面研究了不同温度（300-600 °C）下纳米BC对Cd 2+毒害水稻的缓解作用。在纳米BC的存在下，在不同的根区的Cd 2+通量的动力学也使用扫描离子选择性电极技术进行了测量。结果表明，高温纳米BC对Cd 2+具有较强的吸附能力，其生物量、根系活力、叶绿素含量增加，MDA含量和相对电导率降低，这与纳米BC对Cd 2+的吸附能力有关。此外，我们第一次证明了纳米BC可以差异影响Cd 2+在根尖不同区域的净通量。而纳米BC（尤其是高温下的纳米BC）更显著地提高了抗氧化酶活性（e.例如，在一个实施例中，结果表明，纳米BC处理的水稻植株中SOD、POD、CAT和可溶性蛋白含量均高于单独Cd 2+处理（5.0 mg/L），表明纳米BC可诱导水稻植株产生氧化胁迫。这些结果表明，纳米BC可以显著降低生物炭对Cd 2+的吸收和植物毒性，但其潜在风险不容忽视。
The interaction between biochar nanoparticles (nano-BC) and plant roots in the rhizosphere is largely unknown, although it is crucial for understanding the role of BC in plant growth and bioavailability of pollutants. The effect of nano-BC produced at a series of temperatures (300–600 °C) on alleviating the phytotoxicity of Cd2+to rice plants was investigated from the aspects of biochemical changes and Cd uptake in this study. The kinetics of Cd2+fluxes in different root zones in the presence of nano-BC were also measured using a scanning ion-selective electrode technique. We found that the high-temperature nano-BC could more significantly alleviate the phytotoxicity of Cd2+than the low-temperature and bulk BCs as reflected by the higher increased biomass, root vitality, chlorophyll content, and decreased MDA content as well as relative electrical conductivity of rice plants, which is due to the high adsorption affinity of nano-BC for Cd2+. Also, for the first time we demonstrated that nano-BC could differentially affect the net flux of Cd2+in different zones of the root tips. However, nano-BC (especially that produced at higher temperatures) more significantly increased the contents of antioxidative enzyme activities (e. g., SOD, POD, and CAT) and soluble protein than the treatment only with Cd2+(5.0 mg/L), indicating that nano-BC could induce oxidative stress in the rice plants. These results indicate that nano-BC could greatly reduce the uptake and phytotoxicity of Cd2+, but its potential risk should not be overlooked during the environmental and agricultural applications of biochar.