Då VPD ökar blir assimilationen långsammare eftersom växten tillsluter sina klyvöppningar.
High soil moisture leads to decreased photosynthesis.
In boreal upland forests, low soil moisture decreases the rate of photosynthesis.
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.
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.
"Stage of acclimation" refers to the seasonality of
the litter fall activity.
the flowering activity.
the photosynthetic activity.
the growth activity.
Respiration is a cellular process to obtain chemical energy from
the oxidation of water.
the oxidation of plant tissues.
the oxidation of organic molecules.
the oxidation soil nutrients.
As VPD increases, photosynthesis decreases due to the closure of the stomata.
Låga växter, mikroberna i marken och markens funktioner i allmänhet drar under vintern nytta av.
Välj ett alternative.
de låga temperaturerna
snöns isolerande inverkan
trädens långsammare aktivitet
den ringa mängden solljus
Photoinhibition means the decrease in photosynthesis due to
exposure to shortage of soil moisture.
exposure to excess of CO2.
exposure to high temperature.
exposure to excess of light.
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.
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.
air temperature in this chamber.
PAR radiation next to the chamber.
water vapour concentration in the air of this chamber.
Since stomata are the same pores through which carbon dioxide enters into the leaves, the result of their closure is a reduction in photosynthesis.
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.
In trees, approximately half of the carbon bound in photosynthesis is used for construction of new biomass.