Photoinhibition means the decrease in photosynthesis due to
exposure to excess of CO2.
exposure to excess of light.
exposure to shortage of soil moisture.
exposure to high temperature.
High soil moisture leads to decreased photosynthesis.
In boreal upland forests, low soil moisture decreases the rate of photosynthesis.
Photosynthesis of a shoot can be measured by enclosing it within a chamber and following the change of
air temperature in this chamber.
carbon dioxide concentration in the air of this chamber.
water vapour concentration in the air of this chamber.
PAR radiation next to the chamber.
Leaf area increases with stand age, resulting in a decreasing rate of photosynthesis in the stand.
An increment in leaf area increases also the photosynthesis of a tree stand. However, the relationship is saturating.
When there is low soil moisture, plants close its stomata pores which then decreases photosynthesis.
Photosynthesis shuts down if the temperature of previous night has been lower than
The air is moist if VPD (Vapour Pressure Deficit) is high.
In trees, approximately half of the carbon bound in photosynthesis is used for construction of new biomass.
The stage of acclimation at any given day depends on the temperatures experienced by the plant during the previous months.
The stage of acclimation at any given day depends on the temperatures experienced by the plant during the previous days.
The effect of light on photosynthesis has a clear saturating pattern: more light results in more photosynthesis but eventually leaves cannot take full advantage of all the extra light.
As VPD increases, photosynthesis decreases due to the closure of the stomata.
REW stands for "Relative Extractable Water"
"Stage of acclimation" refers to the seasonality of
the growth activity.
the litter fall activity.
the flowering activity.
the photosynthetic activity.
Plants open its stomata to avoid losing too much water.
Plant closes its stomata to avoid losing too much water.
Respiration is a cellular process to obtain chemical energy from
the oxidation of water.
the oxidation soil nutrients.
the oxidation of plant tissues.
the oxidation of organic molecules.