State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, 311300, China.
State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, 311300, China.
Chemosphere. 2021 Oct;281:130682. doi: 10.1016/j.chemosphere.2021.130682. Epub 2021 May 12.
Green plants have the capability to retain atmospheric particulate matter (PM) on their leaves, which can effectively reduce PM pollution, especially in the urban settings. Some studies reported that the periodic PM pollution could change plant retaining PM capacity, which, indeed, was the reason of physiological responses. In advancing the previous studies, we selected Nerium oleander L. to measure PM retention on leaf surface in a controlled environment by the following periods: initial pollution period (S1), recovery period (R), and secondary pollution period (S2) for a total of 12 weeks. The experimental design was one elevated pollution treatment (166 μg m) and one ambient control (28 μg m) with three replications. Results showed that during S2, the total retention decreased by 8.87 μg cm, which was about 10.4% significant lower than in S1. During the third week, the ascorbic acid content (ASA) in S1 was 6.71 mg g significantly lower than that in S2 in the treatment. The total chlorophyll (Chl T) of the treatment decreased continuously and significantly by 33.8% in S1, but showed no similar trend in S2. The net photosynthetic rate of the treatment was significantly lower than that of the control, and the plants in the treatment showed a consistently high dark respiration rate than that in the control. The correlations between PM retention and ASA, Chl T and RWC were weaker in S1 than that in S2. In addition, air pollution tolerance index (APTI) showed a significant decline in plant pollution tolerance in the treatment during the third week.
绿色植物具有在叶片上保留大气颗粒物 (PM) 的能力，可以有效减少 PM 污染，特别是在城市环境中。一些研究报告称，周期性的 PM 污染会改变植物保留 PM 的能力，这确实是植物产生生理响应的原因。在推进前人的研究中，我们选择夹竹桃来测量在控制环境下叶片表面对 PM 的保留情况，实验共进行了 12 周，分为初始污染期（S1）、恢复期（R）和二次污染期（S2）。实验设计为一个高空污染处理（166μg/m）和一个环境对照（28μg/m），重复三次。结果表明，在 S2 期间，总保留量下降了 8.87μg/cm，比 S1 时显著低 10.4%。在第三周，处理组的 S1 中抗坏血酸含量 (ASA) 显著低于 S2，为 6.71mg/g。处理组的总叶绿素 (Chl T) 在 S1 时持续显著下降 33.8%，但在 S2 时没有类似趋势。处理组的净光合速率明显低于对照组，且处理组的植物持续表现出比对照组更高的暗呼吸速率。在 S1 中，PM 保留量与 ASA、Chl T 和 RWC 的相关性比 S2 时弱。此外，在第三周，植物污染耐受指数 (APTI) 显示处理组植物的污染耐受能力显著下降。
