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Question:
High soil moisture leads to decreased photosynthesis.
Response:
In boreal upland forests, low soil moisture decreases the rate of photosynthesis.
The annual cycle of photosynthesis mainly follows
the changes in light.
the changes in soil temperature.
the changes in CO2 concentration.
the changes in air temperature.
Early spring is a tricky time for plants due to the combination of sunny but still quite cold days.
As plants respire, they release
oxygen.
carbon dioxide.
Photosynthesis releases oxygen whereas respiration releases CO2.
At low air humidity, a plant closes its stomata to prevent transpiration. The action also decreases photosynthesis
What is the source of carbon that is assimilated in photosynthesis?
Soil nutrients
Atmospheric CO2
Solar radiation
Soil water
In general, the more carbon dioxide that is available to the plant, the faster the rate of photosynthesis - if other factors are favourable.
Almost half of the total biomass of a tree may be allocated to the roots.
Photosynthesis of a tree canopy is driven or influenced by
the total leaf area (LAI).
air temperature (T).
air humidity (VPD).
soil moisture (REW).
atmospheric CO2.
photosynthetically active solar radiation (PAR).
In some part of the stems, some photosynthesis may also occur.
A complex microbiota lives belowground, releasing carbon dioxide to the soil.
Plants open its stomata to avoid losing too much water.
Plant closes its stomata to avoid losing too much water.
To transform atmospheric CO2 into organic molecules, plants can use the energy from
soil nutrients.
atmospheric oxygen.
sun light.
soil heat.
Photoinhibition means the decrease in photosynthesis due to
exposure to shortage of soil moisture.
exposure to excess of light.
exposure to excess of CO2.
exposure to high temperature.
Carbon capture is performed by the green parts of plants via photosynthesis.
