Heavy metal pollution increases CH4 and decreases CO2 emissions due to soil microbial changes in a mangrove wetland: Microcosm experiment and field examination
Heavy metal pollution increases CH4 and decreases CO2 emissions due to soil microbial changes in a mangrove wetland: Microcosm experiment and field examination
复制标题
红树林湿地土壤微生物变化导致重金属污染增加CH4并减少CO2排放：微观实验和现场检查
DOI：
10.1016/j.chemosphere.2020.128735
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发表时间：
2021-02-17
期刊：
影响因子：
8.8
通讯作者：
Lin, Chuxia
中科院分区：
文献类型：
--
作者：
Ma, Jiaojiao;Ullah, Sami;Lin, Chuxia
红树林通过相对于其温室气体排放潜力的大量蓝碳储存在调节全球变暖中起着重要作用。红树林湿地中重金属的存在会影响土壤微生物群落，进而影响土壤有机质的分解和温室气体的排放。通过野外监测和微宇宙实验研究了重金属污染对土壤微生物群落和温室气体排放通量的影响。结果表明，重金属污染降低了土壤微生物功能群（异养菌和石养菌）的丰富度和多样性，但并未抑制产甲烷菌群的活性，这可能是由于它们对重金属毒性的耐受性较强。结果表明，重金属的存在显著增加了红树林土壤CH4的排放量，而减少了CO2的排放量。土壤有机碳含量也可以缓冲重金属污染的影响，减少对微生物的毒性，从而影响CO2的排放。研究结果对认识红树林湿地重金属污染导致温室气体排放的复杂性具有重要意义。(C)2020爱思唯尔有限公司保留所有权利。
Mangrove plays an important role in modulating global warming through substantial blue carbon storage relative to their greenhouse gas emission potential. The presence of heavy metals in mangrove wetlands can influence soil microbial communities with implications for decomposition of soil organic matter and emission of greenhouse gases. In this study, field monitoring and a microcosm experiment were conducted to examine the impacts of heavy metal pollution on soil microbial communities and greenhouse gas fluxes. The results show that heavy metal pollution decreased the richness and diversity of the overall soil microbial functional groups (heterotrophs and lithotrophs); however, it did not inhibit the activities of the methanogenic communities, possibly due to their stronger tolerance to heavy metal toxicity compared to the broader soil microbial communities. Consequently, the presence of heavy metals in the mangrove soils significantly increased the emission of CH4 while the emission of CO2 as a proxy of soil microbial respiration was decreased. The soil organic carbon content could also buffer the effect of heavy metal pollution and influence CO2 emissions due to reduced toxicity to microbes. The findings have implications for understanding the complication of greenhouse gas emissions by heavy metal pollution in mangrove wetlands. (C) 2020 Elsevier Ltd. All rights reserved.