Evidence for negative effects of ZnO nanoparticles on leaf litter decomposition in freshwater ecosystems†,Environmental Science: Nano

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Evidence for negative effects of ZnO nanoparticles on leaf litter decomposition in freshwater ecosystems†
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2017-11-08 00:00:00 , DOI: 10.1039/c7en00784a
Jingjing Du _{1,

2,

3,

4,

5} , Yuyan Zhang _{1,

2,

3,

4} , Minghui Cui _{1,

2,

3,

4} , Jingchao Yang _{1,

2,

3,

4} , Zhongdian Lin _{1,

2,

3,

4} , Hongzhong Zhang _{1,

2,

3,

4,

5}

Affiliation

We investigated the negative effects of ZnO nanoparticles (NPs) on ecosystem function by focusing on the process of leaf litter decomposition in an aquatic ecosystem. In an indoor microcosm experiment, the influence of 3 different sizes (30, 90 and 200 nm) of ZnO NPs at 100 mg L⁻¹ concentration on Populus nigra L. leaf litter decomposition was determined. Exposure to ZnO NPs significantly inhibited the leaf litter decomposition and a strong inhibitory effect occurred on day 10, 17, and 27 in the 90, 30, and 200 nm ZnO microcosms, respectively. After 46 days' exposure of leaf litter, the highest decomposition rate was found in the control microcosms (0.47 m⁻¹), followed by the 200 nm ZnO microcosms (0.37 m⁻¹), the ZnSO₄ microcosms (0.36 m⁻¹), the 30 nm ZnO microcosms (0.28 m⁻¹), and 90 nm ZnO microcosms (0.25 m⁻¹), respectively. A significant decrease of the microbial biomass and enzyme activities (acid phosphatase, cellobiohydrolase, N-acetylglucosaminidase, polyphenol oxidase, and peroxidase) was observed in the ZnO NP exposure microcosms. ZnO NPs caused damage to the mycelium of aquatic hyphomycete and altered the composition of the fungal community associated with litter decomposition. In conclusion, the study expanded our understanding of ZnO NP toxicity on decomposition systems in freshwater ecosystems and highlighted the importance of using litter decomposition processes in NPs ecotoxicity assessments.

中文翻译：

纳米氧化锌对淡水生态系统叶片凋落物分解的负面影响的证据†

我们通过关注水生生态系统中叶片凋落物分解的过程，研究了ZnO纳米颗粒（NPs）对生态系统功能的负面影响。在室内微观实验中，确定了100 mg L ^-1浓度下3种不同大小（30、90和200 nm）的ZnO NPs对黑杨叶片凋落物分解的影响。暴露于ZnO NPs会显着抑制叶片凋落物的分解，并且分别在90、30和200 nm ZnO缩影的第10、17和27天产生了强烈的抑制作用。叶片凋落物暴露46天后，在对照微观世界（0.47 m ^-1）中分解率最高，其次是200 nm ZnO微观世界（0.37 m ^-1），即ZnSO ₄缩影（0.36 m ^-1），30 nm ZnO缩影（0.28 m ^-1）和90 nm ZnO缩影（0.25 m ^-1）。在ZnO NP暴露的微观世界中观察到微生物生物量和酶活性（酸性磷酸酶，纤维二糖水解酶，N-乙酰氨基葡糖苷酶，多酚氧化酶和过氧化物酶）显着降低。ZnO NPs破坏了水生真菌的菌丝体，并改变了与凋落物分解有关的真菌群落的组成。总之，该研究扩大了我们对ZnO NP对淡水生态系统分解系统毒性的理解，并强调了在NPs生态毒性评估中使用凋落物分解过程的重要性。

更新日期：2017-11-08

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