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BIO305 – Ecophysiology: The Science of Plant Function and Environmental Interaction (2025 Edition)

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Master the core of plant ecophysiology — how plants function, adapt, and thrive across spatial and temporal scales from leaf to landscape and seconds to rotations. These comprehensive, exam-ready notes cover the carbon, water, and nutrient cycles, key physiological laws like Lambert-Beer’s Law, and essential equations for photosynthesis, respiration, water balance, and growth efficiency. Understand the structure and role of chloroplasts, rubisco, and photosynthetic pathways (C3, C4, CAM, SAM), and learn how environmental stressors such as VPD, temperature, soil water, and frost modify plant productivity. Explore water potential dynamics, transpiration processes, nutrient status diagnostics, and adaptive responses like dessication avoidance and stomatal regulation. Designed for clarity and accuracy, this guide connects biophysical theory with real-world applications in forestry, environmental science, and sustainable plant management.

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BIO305 – Ecophysiology: The Science of Plant
Function and Environmental Interaction (2025
Edition)
ecophysiology - the functioning of a plant in response to it's conditions and
surroundings

spatial scales - leaf, branch, tree, plot, stand, forest, landscape

time scales - second, minute, hour, day, month, year, rotation decision levels -
strategic, tactical, operational

3 cycles in ecophysiology - carbon, water, nutrient

2 carbon cycle equations - GPP = AGPP + AGR + BGCF

NPP = GPP - R

law that governs intercepted radiation via LAI - lambert-beer's law

what LUE is measured in and by - 3PG canopy quantum efficiency (daily, seasonal, or annual), by
AGPP / GPP response to intercepted radiation

6 growth modifiers of 3PG - VPD,

soil water,

temperature,

frost,

stand age,

nutrition

leaf anatomy - upper epidermis,

palisade mesophyll (with chloroplasts),

spongey mesophyll (with chloroplasts),

air space,

lower epidermis (with stomata)

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Subjects

  • water potential
  • growth efficiency
  • 3pg model
  • lambert beers law
  • stomatal conductanc
  • transpiration
  • chlorophyll fluorescence
  • rubisco
  • photosynthesis
  • nutrient cycle
  • water balance
  • ecophysiology

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