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A multi-year study of ecosystem production and its relation to biophysical factors over a temperate peatland
Agricultural and Forest Meteorology ( IF 6.2 ) Pub Date : 2023-05-26 , DOI: 10.1016/j.agrformet.2023.109529
Patryk Poczta , Marek Urbaniak , Torsten Sachs , Kamila M. Harenda , Agnieszka Klarzyńska , Radosław Juszczak , Dirk Schüttemeyer , Bartosz Czernecki , Anna Kryszak , Bogdan H. Chojnicki

Peatlands are among the largest stocks of soil carbon, which can be stored for thousands of years under well-wetted conditions. The main goals of the study were to assess annual and seasonal CO2 balances of a temperate peatland and the main biophysical factors affecting these CO2 fluxes. The studied peatland was usually a CO2 sink with a mean annual net ecosystem production (NEP) of 110±83 gCO2-C·m−2·yr−1 and extreme balances in 2006 (-17 gCO2-C·m−2·yr−1) and 2011 (194 gCO2-C·m−2·yr−1). Annual fluxes were not significantly correlated with biophysical variables, unlike seasonal data. Furthermore, the average air temperature in spring and summer was related to NEP at r2=0.65 and r2=0.61, respectively (warmer spring increased NEP while hot summer decreased NEP in these seasons). A decrease in daytime measured NEP during the summer period (June-August) was observed when TA exceeded 25 °C or VPD was above 15 hPa, respectively, due to the growing Reco and possibly plant photorespiration. These findings suggest a negative impact of ongoing global warming on temperate peatland CO2 balances.



中文翻译:

温带泥炭地生态系统生产及其与生物物理因素关系的多年研究

泥炭地是最大的土壤碳库之一,在湿润条件下可以储存数千年。该研究的主要目标是评估温带泥炭地的年度和季节性 CO 2平衡以及影响这些 CO 2通量的主要生物物理因素。所研究的泥炭地通常是一个 CO 2汇,年平均净生态系统产量 (NEP) 为 110±83 gCO 2 -C·m -2 ·yr -1和 2006 年的极端平衡 (-17 gCO 2 -C·m - 2 ·yr −1 ) 和 2011 (194 gCO 2 -C·m −2 ·yr −1). 与季节性数据不同,年度通量与生物物理变量没有显着相关性。此外,春季和夏季的平均气温与 NEP 相关,分别为 r 2 =0.65 和 r 2 =0.61(温暖的春季增加了 NEP,而炎热的夏季降低了这些季节的 NEP)。当 TA 超过 25 °C 或 VPD 高于 15 hPa 时,观察到夏季(6 月至 8 月)白天测量的 NEP 减少,这是由于 R eco 和可能的植物光呼吸的增长这些发现表明持续的全球变暖对温带泥炭地 CO 2平衡有负面影响。

更新日期:2023-05-27
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