Question:
High soil moisture leads to decreased photosynthesis.
Response:
In boreal upland forests, low soil moisture decreases the rate of photosynthesis.
Carbon capture is performed by the green parts of plants via photosynthesis.
What is the source of carbon that is assimilated in photosynthesis?
Soil nutrients
Atmospheric CO2
Solar radiation
Soil water
Plants open its stomata to avoid losing too much water.
Plant closes its stomata to avoid losing too much water.
Photoinhibition means the decrease in photosynthesis due to
exposure to shortage of soil moisture.
exposure to excess of light.
exposure to high temperature.
exposure to excess of CO2.
exposure to high temperature
exposure to shortage of soil moisture
exposure to excess of CO2
exposure to excess of light
Carbon becomes locked as part of the accumulating plant biomass as plants grow.
Plant respiration captures CO2.
Unlike photosynhesis, plant respiration captures atmospheric oxygen and releases carbon dioxide.
The annual cycle of photosynthesis mainly follows
the changes in CO2 concentration.
the changes in air temperature.
the changes in light.
the changes in soil temperature.
Photosynthesis of a tree canopy is driven or influenced by
soil moisture (REW).
the total leaf area (LAI).
atmospheric CO2.
photosynthetically active solar radiation (PAR).
air temperature (T).
air humidity (VPD).
A complex microbiota lives belowground, releasing carbon dioxide to the soil.
As plants respire, they release
oxygen.
carbon dioxide.
Photosynthesis releases oxygen whereas respiration releases CO2.
When there is low soil moisture, plants close its stomata pores which then decreases photosynthesis.
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.
In some part of the stems, some photosynthesis may also occur.
In general, the more carbon dioxide that is available to the plant, the faster the rate of photosynthesis - if other factors are favourable.
