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A first approach was done for two <jats:italic>Sphagnum<\/jats:italic> species inhabiting a boreal peatland in Finland. Gas exchange at different temperatures and moss hydration were measured to model net assimilation using simultaneous measurements of photosynthesis and dark respiration. In addition, measurements of moss surface temperature at different water content were performed in the field, covering natural conditions of sun exposure and air temperature. We also accounted for the interaction effect between moss canopy temperature and air temperature, radiation, and water content. Our model accurately predicted net assimilation and was used to estimate net primary productivity based on meteorological inputs and moss water content. The two <jats:italic>Sphagnum<\/jats:italic> species presented optimum temperatures for net CO<jats:sub>2<\/jats:sub> assimilation around 25\u00b0C, with minimum changes at other temperatures. In contrast, dark respiration increased exponentially with temperature, which makes losses of carbon during the night and the duration of dark conditions key determinants in the carbon balance of <jats:italic>Sphagnum<\/jats:italic>. The modeled net primary productivity revealed an enhancement of CO<jats:sub>2<\/jats:sub> fixation under warming conditions (averaged +10\u00b0C), concomitant to the expected transformation of peatlands from sink to source of CO<jats:sub>2<\/jats:sub>. Our model highlighted the importance of respiration restriction in ensuring positive assimilation in <jats:italic>Sphagnum<\/jats:italic>. Therefore, day and night temperature oscillation and short night photoperiods are more important than the optimum temperature of photosynthesis for carbon balance.<\/jats:p>","DOI":"10.1111\/ppl.70325","type":"journal-article","created":{"date-parts":[[2025,6,13]],"date-time":"2025-06-13T10:24:56Z","timestamp":1749810296000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Modelling Net <scp>CO<sub>2<\/sub><\/scp> Assimilation of Two <i>Sphagnum<\/i> Species From Temperature and Water Content Response"],"prefix":"10.1111","volume":"177","author":[{"given":"Alicia V.","family":"Perera\u2010Castro","sequence":"first","affiliation":[{"name":"Department of Botany, Ecology and Plant Physiology Universidad de La Laguna  La Laguna Canary Islands Spain"},{"name":"Institute of Biology University of Hohenheim  Stuttgart Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Miquel","family":"Nadal","sequence":"additional","affiliation":[{"name":"AgroParisTech, INRAE, UMR Silva Universit\u00e9 de Lorraine  Nancy France"},{"name":"Departamento de Sistemas Agr\u00edcolas, Forestales y Medio Ambiente Centro de Investigaci\u00f3n y Tecnolog\u00eda Agroalimentaria de Arag\u00f3n (CITA)  Zaragoza Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,6,13]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.soilbio.2018.01.029"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/gcb.16182"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.2307\/2390227"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/ece3.2119"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/1365-2745.13499"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.5194\/bg-6-1849-2009"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.5194\/bg-12-2101-2015"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00703-010-0104-x"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1469-185X.2009.00084.x"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467-022-33370-1"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ecolmodel.2012.11.029"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1002\/pld3.570"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.21425\/F5FBG51146"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.5194\/bg-10-929-2013"},{"key":"e_1_2_9_16_1","doi-asserted-by":"publisher","DOI":"10.1111\/gcb.15099"},{"key":"e_1_2_9_17_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00300-018-2299-0"},{"key":"e_1_2_9_18_1","doi-asserted-by":"publisher","DOI":"10.1101\/pdb.prot5136"},{"key":"e_1_2_9_19_1","unstructured":"Cris R. 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