Pennisetum sp. was employed as a model species to detect the growth and physiological response to cadmium (Cd) stress at different Cd concentrations (0, 20, 50, and 100 mg kg−1) in three types of soils (yellow brown soil, yellow soil, and red soil). Results showed that the growth of Pennisetum sp. was not significantly influenced by Cd in 20 mg kg−1, but significantly inhibited at higher Cd concentrations in three types of soils. Besides, the higher Cd concentrations, the lower root, stem, and leaf biomass. With Cd concentration of soil increasing, Cd content of root, stem, and leaf increased. Compared with no Cd, high Cd concentrations (50 and 100 mg kg−1) induced the physiological indices (photosynthetic rate, stomatal conductance, transpiration rate) and biochemical indices (nitrate reductase, glutamine synthetase, and glutamate synthase activities) decreasing, but the concentration of NO3− and NH4+ increasing. The activity of antioxidative enzymes (SOD, POD, and CAT) was disrupted and the content of malondialdehyde (MDA) increasing. Pennisetum sp. could protect cells from damage and maintain normal physiological metabolism via increasing the production of soluble sugar and soluble protein, but soluble proteins and soluble sugars were limited in high concentrations of Cd (50 and 100 mg kg−1). Moreover, the growth and physiological response to Cd are different in the three types of soils. The growth of Pennisetum sp. in yellow brown soil was better than that in other two soils, and the gas exchange rate, antioxidant enzyme activity, and nitrogen metabolism in yellow soil and red soil were more affected by Cd stress than that in yellow brown soil. Overall, Pennisetum sp. had certain tolerance and biosorption ability to Cd in different Cd concentrations and different types of soil. Hence, Pennisetum sp. was a suitable choice for Cd remediation, especially in yellow brown soil.
国际化学品管理大会第四届会议(Fourth of the International Conference of Chemicals Management,ICCM4)通过第IV/4决议,建议考虑2020年后化学品与废物健全管理工作安排,并决定启动闭会期间进程,就国际化学品管理战略方针(Strategic Approach To International Chemicals Management,SAICM)及2020年后化学品与废物健全管理工作制定建议。“2020年后国际化学品与废物健全管理”是当前国际化学品管理战略闭会期间历次磋商进程谈判的重点,了解该框架的谈判进展及各方主要观点将对我国参与国际谈判产生积极作用。本文系统梳理了闭会期间历次磋商进程的主要内容,并对2020年后化学品与废物健全管理新框架文件涉及的愿景、原则和方法、战略目标和指标、体制安排和实施机制、财政考虑、高级别政治承诺等主要国家立场态度进行了观点综述。为应对国际谈判,建议我国采取以下措施推进国际谈判:做好国内发展趋势研判,积极参与谈判进程;建立协调机制,调动利益攸关方的积极性;加强知识信息共享,提升化学品管理能力;充分利用高级别会议,提升政治层面对2020年后框架的重视程度。 相似文献