Inland lakes are important ecosystems for the carbon cycle at both regional and global scales. However, a knowledge gap still exists about the correlations between the partial pressure of CO₂ (pCO₂) and nutrient dynamics in lakes. In this study, we analysed the long-term dynamics of nutrient and pCO₂ in Taihu Lake. Strong spatial heterogeneity was observed with highest nutrient concentrations occurring in the River mouth and significant lower concentrations (p < 0.01) occurring in East Taihu and Other zone. For pCO₂, the average values were 1136.81 ± 1240.16 μatm, 433.07 ± 305.45 μatm, and 487.05 ± 414.02 μatm in Rive mouth, East Taihu, and Other zone, respectively. Statistical analysis revealed that pCO₂ was significantly and positively related to nutrient (TN: total nitrogen and NH₄⁺: ammonium) concentrations (p < 0.01), but negatively related to Chla (Chlorophyll a) concentrations in River mouth and Other zone (p < 0.01). The parallelism of nutrient concentrations and pCO₂ in Taihu Lake highlights the dual effects of external pollution inputs from the surrounding catchment. In addition, progressive mitigation was found for not only nutrients but also pCO₂, which was attributed to the previous effort in the environmental protections in Taihu Lake basin. Our results also suggest the importance of long-term monitoring for the future assessment of anthropogenic impacts on nutrient and CO₂ dynamics in freshwater lakes.

内陆湖泊是区域和全球范围内碳循环的重要生态系统。然而，关于CO ₂的分压（pCO ₂）与湖泊养分动态之间的相关性仍然存在知识差距。在这项研究中，我们分析了太湖养分和pCO ₂的长期动态。观察到强烈的空间异质性，在河口出现了最高的养分浓度，而 在东太湖和其他地区则出现了明显较低的养分浓度（p <0.01）。对于pCO ₂，Rive口，东太湖和其他地区的平均值分别为1136.81±1240.16μatm，433.07±305.45μatm和487.05±414.02μatm。统计分析表明，pCO₂与养分（TN：总氮和NH ₄ ⁺：铵）的浓度显着正相关（p  <0.01），但与河口和其他地区的Chla（叶绿素a）浓度呈负相关（p  <0.01）。太湖养分浓度与pCO ₂的平行性突出了周围流域外部污染输入的双重影响。此外，发现不仅营养素而且pCO ₂都得到了逐步缓解。，这归功于太湖流域以前在环境保护方面的努力。我们的结果还表明，长期监测对于未来人为对淡水湖中养分和CO ₂动态影响的评估至关重要。