[Dataset:] Photosynthesis data belonging to publication 'In situ temperature response of photosynthesis of 42 tree and liana species in the canopy of two Panamanian lowland tropical forests with contrasting rainfall regimes'

Abstract to the publication from this dataset: Tropical forests contribute
significantly to the global carbon cycle, but little is known about the
temperature response of photosynthetic carbon uptake in tropical species, and
how this varies within and across forests. We determined in situ
photosynthetic temperature-response curves for upper-canopy leaves of 42 tree
and liana species from two tropical forests in Panama with contrasting
rainfall regimes. Based on seedling studies we hypothesized that species with
high photosynthetic capacity-light-demanding, fast-growing species-would have
a higher temperature optimum of photosynthesis (TOpt) than species with low
photosynthetic capacity-shade-tolerant, slow-growing species-and that,
therefore, TOpt would scale with species' position on the slow-fast continuum
of plant functional traits. TOpt was remarkably similar across species,
regardless of species' photosynthetic capacity and other plant functional
traits. Community-average TOpt was almost identical to mean maximum daytime
temperature, which was higher at the dry forest. Photosynthesis above TOpt
appeared to be more strongly limited by stomatal conductance at the dry forest
than at the wet forest. The observation that all species in a community shared
similar TOpt values suggests that photosynthetic performance is optimized
under current temperature regimes. These results should facilitate scaling up
photosynthesis in relation to temperature from leaf to stand level in species-
rich tropical forests. DOY: Day of year. Site: PNM: Parque Natural
Metropolitano, FTS: Fort Sherman (= Parque Nacional San Lorenzo). Form: Tree
or Liana. Species: Only genus name give. See paper for full species and family
names. Rep: Replicate individual . Leaf: 100 = pooled data (every leaf
measured once) replicate tree 1, 102 = pooled data replicate tree 2. Time:
Time of day in a metric 0-24 scale. Tleaf: °C. Photo: Photosynthetic rate
(μmol CO2 m-2 s-1). Cond: Conductance to H2O (mol H2O m-2 s-1). Ci:
Intercellular CO2 concentration (μmol CO2 mol-1). Trmmol: mmol H2O m-2 s-1.
VpdL: Vapor pressure deficit based on Leaf temp (kPa). Tair: °C. TBlk: °C.
CO2R: Reference cell CO2 (μmol CO2 mol-1). CiCa: Intercellular CO2 / Ambient
CO2. CO2S: Sample cell CO2 (μmol CO2 mol-1).