The 'plant economic spectrum' in bryophytes, a comparative study in subalpine forest

Area of Science:

• Ecology
• Plant Physiology
• Evolutionary Biology

Background:

• Functional traits in vascular plants are well-studied, revealing key tradeoffs.
• Similar tradeoffs and trait relationships in bryophytes remain largely unexplored.
• Understanding bryophyte functional ecology is crucial for a complete picture of plant adaptation.

Purpose of the Study:

• To investigate functional trait values and relationships in bryophytes.
• To compare bryophyte trait economics with vascular plants.
• To determine if bryophytes exhibit similar tradeoffs as vascular plants.

Main Methods:

• Quantified shoot mass per area (SMA), assimilation rate (Amass), respiration rate (Rdmass), N and P concentrations (Nmass, Pmass), and N and P use efficiencies (PNUE, PPUE) for 28 bryophytes.
• Compared bryophyte trait data with the Global Plant Trait Network (GLOPNET) dataset for vascular plants.
• Analyzed bivariate relationships and scaling of functional traits.

Main Results:

• Bryophytes had lower Amass, Nmass, N:P, PNUE, and PPUE than vascular plants.
• Bryophytes showed higher Pmass, with similar SMA and Rdmass compared to vascular plants.
• Nutrient concentrations (Nmass, Pmass) correlated with metabolic rates (Amass, Rdmass) and inversely with SMA, with faster metabolic scaling with nutrients in bryophytes.

Conclusions:

• Bryophytes share similar functional trait relationships with vascular plants, confirming tradeoffs.
• The slopes of trait relationships differ between bryophytes and vascular plants.
• Bryophytes allocate greater proportions of nitrogen and phosphorus to metabolic pools.