High soil moisture leads to decreased photosynthesis.
In boreal upland forests, low soil moisture decreases the rate of photosynthesis.
In trees, approximately half of the carbon bound in photosynthesis is used for construction of new biomass.
Photoinhibition means the decrease in photosynthesis due to
exposure to shortage of soil moisture.
exposure to high temperature.
exposure to excess of CO2.
exposure to excess of light.
Photosynthesis shuts down if the temperature of previous night has been lower than
Respiration is a cellular process to obtain chemical energy from
the oxidation of organic molecules.
the oxidation of plant tissues.
the oxidation soil nutrients.
the oxidation of water.
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.
Since stomata are the same pores through which carbon dioxide enters into the leaves, the result of their closure is a reduction in photosynthesis.
"Stage of acclimation" refers to the seasonality of
the growth activity.
the photosynthetic activity.
the litter fall activity.
the flowering activity.
Photosynthesis of a shoot can be measured by enclosing it within a chamber and following the change of
carbon dioxide concentration in the air of this chamber.
PAR radiation next to the chamber.
water vapour concentration in the air of this chamber.
air temperature in this chamber.
Plants open its stomata to avoid losing too much water.
Plant closes its stomata to avoid losing too much water.
The air is moist if VPD (Vapour Pressure Deficit) is high.
When there is low soil moisture, plants close its stomata pores which then decreases photosynthesis.
REW stands for "Relative Extractable Water"
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.
As VPD increases, photosynthesis decreases due to the closure of the stomata.