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.
Photosynthesis of a shoot can be measured by enclosing it within a chamber and following the change of
water vapour concentration in the air of this chamber.
carbon dioxide concentration in the air of this chamber.
PAR radiation next to the chamber.
air temperature in this chamber.
REW stands for "Relative Extractable Water"
When there is low soil moisture, plants close its stomata pores which then decreases photosynthesis.
Plants open its stomata to avoid losing too much water.
Plant closes its stomata to avoid losing too much water.
High soil moisture leads to decreased photosynthesis.
In boreal upland forests, low soil moisture decreases the rate of photosynthesis.
Eftersom koldioxid kommer in i växten genom klyvöppningarna går assimilationen långsammare då klyvöppningarna tillsluts.
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.
Låga växter, mikroberna i marken och markens funktioner i allmänhet drar under vintern nytta av.
Välj ett alternative.
trädens långsammare aktivitet
snöns isolerande inverkan
den ringa mängden solljus
de låga temperaturerna
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
Då VPD ökar blir assimilationen långsammare eftersom växten tillsluter sina klyvöppningar.
Respiration is a cellular process to obtain chemical energy from
the oxidation of organic molecules.
the oxidation of plant tissues.
the oxidation of water.
the oxidation soil nutrients.
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.