Lake sediments, as an important emission source of nutrients and greenhouse gases, play a crucial role during the biogeochemical cycle processes. However, the impact mechanisms of different nutrient levels on greenhouse gas emission from lakes are still insufficient. In this study, the sediments from eight shallow lakes in the middle and lower reaches of the Yangtze River were cultured to study the release characteristics of greenhouse gases more than one month. Results showed that the greenhouse gases during the mineralization processes of sediments were mainly released to the atmosphere instead of being dissolved in the overlying water. The released concentrations of CH₄ and CO₂ were as high as 1 × 10³ μmol L⁻¹ in the later stage of the experiment, while the concentration of N₂O was relatively low with a maximal value of about 10 μmol L⁻¹. In addition, all the lake sediments displayed a nutrient release to the overlying water, where the concentrations of TC, TOC, TN, NH₄⁺-N and TP were up to 173.0, 102.7, 36.7, 30.8 and 6.34 mg L⁻¹, respectively. The nutrient levels of different lake sediments are symmetrical to the released nutrients concentrations in the overlying water. The further statistical analysis illustrated a synchronous nutrient controlled-release of greenhouse gases, that is, the higher the levels of nutrients in the sediments, the higher the concentrations of greenhouse gases released. These findings provide a better understanding that the control of endogenous nutrient levels of sediments is extremely important for lacustrine management, which can play a positive role in mitigating the greenhouse gas emissions from lake sediments.

中文翻译：

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不同湖泊沉积物矿化过程中温室气体的同步养分受控释放。

湖泊沉积物是养分和温室气体的重要排放源，在生物地球化学循环过程中起着至关重要的作用。但是，不同养分水平对湖泊温室气体排放的影响机理仍不充分。本文研究了长江中下游八个浅水湖泊的沉积物，研究了一个多月的温室气体排放特征。结果表明，沉积物矿化过程中的温室气体主要释放到大气中，而不是溶解在上覆水中。CH的释放浓度₄和CO ₂分别高达1×10 ³ 微摩尔大号^-1在实验的后期，N ₂ O的浓度相对较低，最大值约为10μmolL ^-1。此外，所有湖泊沉积物都向上层水释放养分，TC，TOC，TN，NH ₄ ⁺ -N和TP的浓度分别高达173.0、102.7、36.7、30.8和6.34 mg L ^-1。， 分别。不同湖泊沉积物的养分水平与上覆水中释放的养分浓度对称。进一步的统计分析表明，温室气体同步释放养分，也就是说，沉积物中养分含量越高，释放的温室气体浓度就越高。这些发现提供了更好的理解，即沉积物的内源营养水平的控制对于湖泊管理极为重要，这在减轻湖泊沉积物中的温室气体排放方面可以发挥积极作用。