High soil moisture leads to decreased photosynthesis.
In boreal upland forests, low soil moisture decreases the rate of photosynthesis.
As VPD increases, photosynthesis decreases due to the closure of the stomata.
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.
air temperature in this chamber.
water vapour concentration in the air of this chamber.
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
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.
Respiration is a cellular process to obtain chemical energy from
the oxidation soil nutrients.
the oxidation of organic molecules.
the oxidation of plant tissues.
the oxidation of water.
Då VPD ökar blir assimilationen långsammare eftersom växten tillsluter sina klyvöppningar.
Photosynthesis shuts down if the temperature of previous night has been lower than
The air is moist if VPD (Vapour Pressure Deficit) is high.
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.
In trees, approximately half of the carbon bound in photosynthesis is used for construction of new biomass.
"Stage of acclimation" refers to the seasonality of
the growth activity.
the flowering activity.
the litter fall activity.
the photosynthetic activity.
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.
Photoinhibition means the decrease in photosynthesis due to
exposure to excess of CO2.
exposure to shortage of soil moisture.
exposure to excess of light.
exposure to high temperature.