Låga växter, mikroberna i marken och markens funktioner i allmänhet drar under vintern nytta av.
Välj ett alternative.
den ringa mängden solljus
snöns isolerande inverkan
trädens långsammare aktivitet
de låga temperaturerna
Då VPD ökar blir assimilationen långsammare eftersom växten tillsluter sina klyvöppningar.
"Stage of acclimation" refers to the seasonality of
the photosynthetic activity.
the growth activity.
the flowering activity.
the litter fall activity.
Eftersom koldioxid kommer in i växten genom klyvöppningarna går assimilationen långsammare då klyvöppningarna tillsluts.
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.
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.
In trees, approximately half of the carbon bound in photosynthesis is used for construction of new biomass.
Photosynthesis shuts down if the temperature of previous night has been lower than
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
air temperature in this chamber.
PAR radiation next to the chamber.
water vapour concentration in the air of this chamber.
carbon dioxide concentration in the air of this chamber.
Photoinhibition means the decrease in photosynthesis due to
exposure to excess of CO2.
exposure to high temperature.
exposure to excess of light.
exposure to shortage of soil moisture.
Since stomata are the same pores through which carbon dioxide enters into the leaves, the result of their closure is a reduction in photosynthesis.
The air is moist if VPD (Vapour Pressure Deficit) is high.
REW stands for "Relative Extractable Water"