Impacts of seasonal air and soil temperatures on photosynthesis in Scots pine trees

Strand, Martin; Lundmark, Tomas; Söderbergh, Ingrid; Mellander, Per‐Erik

doi:10.1093/treephys/22.12.839

Cited by 62 publications

(56 citation statements)

References 39 publications

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“…In contrast to the behavior of evergreen species from colder climates, where CO 2 fixation rates close to zero were found in winter (Strand et al 2002), our subject species showed a positive CO 2 balance in this season. In a Mediterranean climate, a depression in net photosynthesis was found in Quercus suber in winter, although the major depression occurred in summer (García-Plazaola et al 1997) concomitantly with stomatal closure, due to drought.…”

Section: Compatible Solutescontrasting

confidence: 99%

Seasonal changes in the photosynthetic performance of two evergreen Nothofagus species in south central Chile

Zúñiga

Alberdi

Reyes‐Díaz³

et al. 2006

Rev. chil. hist. nat.

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The evergreen Nothofagus dombeyi and Nothofagus nitida are important members of the temperate Chilean rainforest. They seldom grow together in nature. Nothofagus nitida is more susceptible to excess light and drought than N. dombeyi. We postulate that the different properties of the photosynthetic apparatus under common garden conditions of these species could explain their contrasting habitat preferences. The two species growing in a common garden in south central Chile were studied. The optimal photochemical efficiency (Fv/Fm) of both species remained within normal values (≈ 0.8) with the exception of a decrease in N. dombeyi at midday in summer, suggesting reversible reduction in photochemical efficiency of photosystem II (PSII). During summer the effective photochemical efficiency (Φ PSII ), photochemical quenching (qP), photosynthesis (A max ), stomatal conductance (gs) and transpiration rates (E) in N. dombeyi were higher than in N. nitida. The highest increments in photoprotective pigments (zeaxanthin + antheraxanthin and lutein) contents between predawn and midday were obtained in summer in N. dombeyi. In N. nitida a nocturnal retention of dissipative pigments, without a decrease in Fv/Fm, was found in winter. The results suggest that N. dombeyi showed a better photosynthetic performance than N. nitida under high light, high temperature, and drier conditions. These data support are consistent with the pioneer character of N. dombeyi and the semitolerant shade properties and more restricted distribution of N. nitida. These photosynthetic characteristics, along with their freezing and flooding resistance differences, may result from their habitat separation.Key words: chlorophyll fluorescence, photosynthesis, Nothofagus dombeyi, Nothofagus nitida, xanthophyll cycle. RESUMENLas siempreverdes, Nothofagus dombeyi y Nothofagus nitida, representantes importantes de los bosques lluviosos templados de Chile, raramente crecen juntos en forma natural. Nothofagus nitida es más sensible al exceso de luz y déficit de agua que N. dombeyi. Se postula que diferentes propiedades del aparato fotosintético bajo condiciones de jardín común de estas especies podrían explicar sus contrastantes preferencias de hábitat. Se estudian algunas de estas propiedades en estas dos especies creciendo en un jardín común en el centro sur de Chile. La eficiencia fotoquímica máxima (Fv/Fm) de ambas especies permanece en el rango de los valores normales (≈ 0,8) con excepción de un decrecimiento al mediodía y en verano en N. dombeyi, que sugiere una reducción reversible de la eficiencia fotoquímica máxima del fotosistema II (PSII). Durante el verano, la eficiencia fotoquímica efectiva del PSII (Φ PSII ), el apagamiento fotoquímico (qP), la fotosíntesis (A max ), conductancia estomática (gs) y las tasas de transpiración (E) en N. dombeyi fueron mayores que en N. nitida. Los mayores incrementos en los contenidos de pigmentos fotoprotectores (zeaxantina + anteraxantina y luteína) entre prealba y mediodía se obtuvieron en verano en N. domb...

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Section: Compatible Solutescontrasting

confidence: 99%

Seasonal changes in the photosynthetic performance of two evergreen Nothofagus species in south central Chile

Zúñiga

Alberdi

Reyes‐Díaz³

et al. 2006

Rev. chil. hist. nat.

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“…The parameters of the root water uptake function were calibrated to obtain the best possible fit of the transpiration. To achieve this, the degree of water uptake was profoundly restricted below a soil temperature of ¾8°C, as observed studies by Mellander et al (2004) and Strand et al (2002) on a young Scots pine stand at a nearby site.…”

Section: Model Applicationmentioning

confidence: 99%

Modelling the effect of low soil temperatures on transpiration by Scots pine

et al. 2006

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Abstract:For ecosystem modelling of the Boreal forest it is important to include processes associated with low soil temperature during spring-early summer, as these affect the tree water uptake. The COUP model, a physically based SVAT model, was tested with 2 years of soil and snow physical measurements and sap flow measurements in a 70-year-old Scots pine stand in the boreal zone of northern Sweden. During the first year the extent and duration of soil frost was manipulated in the field. The model was successful in reproducing the timing of the soil warming after the snowmelt and frost thaw. A delayed soil warming, into the growing season, severely reduced the transpiration. We demonstrated the potential for considerable overestimation of transpiration by the model if the reduction of the trees' capacity to transpire due to low soil temperatures is not taken into account. We also demonstrated that the accumulated effect of aboveground conditions could be included when simulating the relationship between soil temperature and tree water uptake. This improved the estimated transpiration for the control plot and when soil warming was delayed into the growing season. The study illustrates the need of including antecedent conditions on root growth in the model in order to catch these effects on transpiration. The COUP model is a promising tool for predicting transpiration in high-latitude stands.

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“…Western redcedar had higher (P < 0.05) P n rates than yellow-cedar when minimum air temperature was above freezing. Field and laboratory studies have found low, but above freezing, air temperature can limit the photosynthetic process of conifers [31,33,34,44,47].…”

Section: Net Photosynthesismentioning

confidence: 99%

Yellow-cedar and western redcedar ecophysiological response to fall, winter and early spring temperature conditions

Grossnickle¹,

Russell

2006

Ann. For. Sci.

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-Western redcedar (Thuja plicata Donn) and yellow-cedar (Chamaecyparis nootkatensis (D. Don) Spach) populations originating from an elevation zone where these two species naturally coexist were monitored to define their performance patterns in response to seasonal temperature conditions within the fall, winter and early spring field conditions of the Pacific Northwest coastal forest region. Western redcedar and yellow-cedar populations were measured for changes in growth rhythms, photosynthetic patterns and freezing tolerance. Net photosynthesis (P n ) for both species was directly related to minimum air temperature that occurred during the prior evening, though no population differences were detected within each species. Photosynthesis was greater in western redcedar, than yellow-cedar when minimum air temperature was above freezing. Freezing temperatures from ~0 to -5°C caused a greater reduction in photosynthesis for western redcedar, though not a complete cessation of photosynthetic capability in either species. Freezing tolerance increased at a moderate rate in the fall as mean air temperature declined for both species when their shoot systems were still active, with freezing tolerance increasing at a rapid rate when shoot systems showed no mitotic activity. No shoot growth or mitotic activity was detected in shoot tips of both western redcedar and yellow-cedar when mean air temperature decreased to 4°C for the previous week. No population differences, within each species, were detected in the development of fall freezing tolerance. Yellow-cedar obtained a slightly greater level of freezing tolerance when fall temperatures were < 4°C. Both species had a loss of freezing tolerance as mean air temperature increased in late winter. Shoot growth resumed in both species in late winter when mean air temperature increased to 6 to 6.5°C. The resumption of shoot growth resulted in a faster loss of freezing tolerance for western redcedar compared to yellow-cedar. où ces deux espèces coexistent ont été suivies pour définir leurs types de performances en réponse aux conditions thermiques saisonnières de l'automne, de l'hiver et du début du printemps dans la région forestière côtière du Nord Ouest Pacifique. Les populations de Thuja plicata et de Chamaecyparis nootkatensis ont été mesurées pour étudier les variations dans les rythmes de croissance, les types d'activité photosynthétique et la tolérance au gel. Pour les deux espèces, la photosynthèse nette (Pn) était directement liée au minimum de température du soir précédent, bien que des différences n'aient pas été mises en évidence entre populations dans chacune des espèces. La photosynthèse était plus élevée chez Thuja plicata que chez Chamaecyparis nootkatensis lorsque la température minimum était au-dessus de zéro degré. Les températures glaciales de -0 à -5°C induisent la réduction la plus importante de la photosynthèse chez Thuja plicata, quoiqu'il n'y ait pas un complet arrêt de la capacité photosynthétique chez l'une ou l'autre des espèces. Pour les de...

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Impacts of seasonal air and soil temperatures on photosynthesis in Scots pine trees

Cited by 62 publications

References 39 publications

Seasonal changes in the photosynthetic performance of two evergreen Nothofagus species in south central Chile

Seasonal changes in the photosynthetic performance of two evergreen Nothofagus species in south central Chile

Modelling the effect of low soil temperatures on transpiration by Scots pine

Yellow-cedar and western redcedar ecophysiological response to fall, winter and early spring temperature conditions

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