State Key Laboratory of Environmental Criteria and Risk Assessment, National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, State Environmental Protection Key Laboratory for Lake Pollution Control, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
College of Water Sciences, Beijing Normal University, Beijing, 100875, China.
Environ Sci Pollut Res Int. 2023 Jun;30(29):74358-74371. doi: 10.1007/s11356-023-26823-7. Epub 2023 May 19.
Unlike the extensive research on the response of soil microorganisms to high ambient temperature (HTA), the response of sediment microorganisms to HTA remains unclear. Understanding the response of sediment microorganisms to HTA is important to forecast their impacts on ecosystems and climate warming under projected climate change scenarios. Against the background of climate warming and frequent high ambient temperatures in summer, we conducted a laboratory incubation experiment to clarify the unique assembly characteristics of pond sediment bacterial communities at different temperatures (4, 10, 15, 25, 30 and 35 °C). The results showed that the structure and function of the microbial community in pond sediments at 35 °C were different from those under other temperatures; the microbial community structure at 35 °C had the most large modules and an average module size. Temperature and dissolved oxygen influenced the microbial community network modularity. The CO emission rates of pond sediments at 35 °C were significantly higher than those at other temperatures. At 35 °C, heterogeneous selection was the most important assembly process. Additionally, warming altered the microbial network structure and ecosystem functioning but not the microbial diversity or community composition, which may be related to horizontal gene transfer. Revealing the rapid response of pond sediment microorganisms to HTA is important for identifying their role in nutrient cycling and assessing the ecological impacts of climate warming and high ambient temperatures on inland water sediments.
与广泛研究土壤微生物对高温环境（HTA）的响应不同，沉积物微生物对 HTA 的响应仍不清楚。了解沉积物微生物对 HTA 的响应对于预测它们在气候变化情景下对生态系统和气候变暖的影响至关重要。鉴于气候变暖以及夏季频繁出现的高温环境，我们进行了一项实验室培养实验，以阐明不同温度（4、10、15、25、30 和 35°C）下池塘沉积物细菌群落的独特组装特征。结果表明，35°C 下池塘沉积物中微生物群落的结构和功能与其他温度下的不同；35°C 下微生物群落结构具有最多的大模块和平均模块大小。温度和溶解氧影响微生物群落网络模块性。35°C 下池塘沉积物的 CO 排放速率明显高于其他温度。在 35°C 下，异质选择是最重要的组装过程。此外，变暖改变了微生物网络结构和生态系统功能，但没有改变微生物多样性或群落组成，这可能与水平基因转移有关。揭示池塘沉积物微生物对 HTA 的快速响应对于确定它们在营养循环中的作用以及评估气候变暖对内陆水沉积物的生态影响非常重要。
