Peatlands present substantial terrestrial carbon reservoirs actively engaged in land-atmosphere carbon exchanges. Ongoing variations in carbon dynamics, attributed to global climate change, underscore the necessity of elucidating the connections between carbon fluxes and meteorological parameters. Limited studies have delved into disparities in carbon fluxes and the mechanisms mediating them during growing and non-growing seasons on a long-term scale, particularly in subtropical peatlands. Consequently, this study utilized the eddy covariance technique in the Dajiuhu peatland to investigate five-year CH and CO fluxes, longside meteorological characteristics. The Dajiuhu peatland functioned as a CO sink and CH source, ultimately serving as a carbon sink. A substantial portion of the annual fluxes was measured during the non-growing season, with elevated CO uptake and CH emission during the growing season. Further analyses revealed that photosynthetically active radiation (PAR), soil temperature (Ts), air temperature (Ta), and soil water content (SWC) were critical environmental parameters influencing fluctuations in CO and CH fluxes. Two distinct controlling pathways for CO fluxes were identified. In the growing season, PAR emerged as the most influential factor in CO flux variations, and increasing Ts weakened CO absorption by decreasing SWC. During the non-growing season, Ts emerged as the most influential factor in CO exchanges, with lower Ts leading to decreased CO uptake. Additionally, CH flux variations were significantly regulated by PAR and Ts in both periods. The results illustrated that vascular plants played a pivotal role in the dynamics of carbon between peatlands and the atmosphere. Furthermore, it was discovered that the Dajiuhu peatland contributed to mitigating global warming in both the short and long term, with SGWP identified as a more reliable evaluation index. Our findings underscore the essential ecological function of the Dajiuhu subtropical peatland and provide a theoretical foundation for scientifically managing carbon in natural subtropical peatlands.

中文翻译：

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大九湖亚热带泥炭地生长季和非生长季的二氧化碳和甲烷通量：利用涡度协方差技术进行的五年测量


泥炭地拥有大量陆地碳库，积极参与陆地-大气碳交换。全球气候变化导致的碳动态的持续变化强调了阐明碳通量与气象参数之间联系的必要性。有限的研究长期深入研究了生长季和非生长季碳通量的差异以及调节碳通量的机制，特别是在亚热带泥炭地。因此，本研究利用涡度协方差技术在大九湖泥炭地研究了五年CH和CO通量以及长边气象特征。大九湖泥炭地起到了二氧化碳汇和甲烷源的作用，最终起到了碳汇的作用。年通量的很大一部分是在非生长季节测量的，生长季节期间二氧化碳吸收量和甲烷排放量增加。进一步分析表明，光合有效辐射（PAR）、土壤温度（Ts）、气温（Ta）和土壤含水量（SWC）是影响CO和CH通量波动的关键环境参数。确定了二氧化碳通量的两种不同的控制途径。在生长季节，PAR 成为 CO 通量变化最有影响的因素，Ts 的增加通过减少 SWC 减弱了 CO 的吸收。在非生长季节，Ts 成为 CO 交换中最有影响力的因素，较低的 Ts 导致 CO 吸收量减少。此外，这两个时期的 CH 通量变化均受到 PAR 和 Ts 的显着调节。结果表明，维管束植物在泥炭地和大气之间的碳动态中发挥着关键作用。 此外，研究发现大九湖泥炭地在短期和长期内都对减缓全球变暖做出了贡献，SGWP被确定为更可靠的评价指标。我们的研究结果强调了大九湖亚热带泥炭地的重要生态功能，为科学管理亚热带天然泥炭地的碳提供了理论基础。