More humidity lowers vapor-pressure deficit
, which is the difference between the amount of moisture in the air and how much moisture the air can hold (i.e.
Furthermore, when plants are not subjected to water stress, nighttime transpiration is highly correlated to vapor-pressure deficit.18 Therefore, considering climate change models have forecasted that nighttime temperatures will increase at a higher rate compared with diurnals, nighttime transpiration might be exacerbated in future global-warming scenarios."
comparing S data with the atmospheric demand for water as nighttime vapor-pressure deficit (VPD).
Variability in crop radiation use efficiency associated with vapor-pressure deficit
. Field Crops Res.
For example, the relationship between leaf and air temperatures and VPD (vapor-pressure deficit) were very strong for all species within a single date as well as across the season [ILLUSTRATION FOR FIGURES 4 AND 5 OMITTED].
A high vapor-pressure deficit may have reduced conductance and then subsequently photosynthesis as well.