Results 141 to 150 of about 10,533 (172)

Time Lag of Stem Water Deficit in Response to Increased Vapor Pressure Deficit

Forest Science, 2023
Abstract Vapor pressure deficit (VPD) shows a gradually increasing trend that forces trees to produce ecological memory with time-delay characteristics to drought year by year. The reversible stem diameter variation of trees can serve as an indicator for tree water status.
Yuan Tian, Xuan Liu, Xin Zhang, Sa Rula, Zhibing Wan, Hanqing Zhao, Qiuliang Zhang   +6 more
openaire   +1 more source

Assessment of vapor pressure deficit variability and trends in Spain and possible connections with soil moisture [PDF]

Atmospheric Research, 2023
The Vapor Pressure Deficit (VPD) is one of the most relevant surface meteorological variables; with important implications in ecology, hydrology, and atmosphere.
Tomás-Burguera, M., El Kenawy, A., Tomás-Burguera, Miquel, Azorín-Molina, César, Lorenzo-Lacruz, Jorge, El Kenawy, Ahmed M., Domínguez-Castro, F., Halifa-Marín, A., Halifa-Marín, Amar, Vicente-Serrano, S.M., Juez, C., Domínguez-Castro, Fernando, Fernández-Duque, Beatriz, Peña-Angulo, D., Vicente Serrano, Sergio M., Juez, Carmelo, Peña-Angulo, Dhais, Noguera, Iván, Lorenzo-Lacruz, J., Fernández-Duque, B., Noguera, I., Azorin-Molina, C.   +21 more
exaly   +4 more sources

Vapor Pressure Deficit Control Strategies for Plant Production

IFAC Postprint Volumes IPPV / International Federation of Automatic Control, 1998
Abstract Research to develop control strategies to implement vapor pressure deficit (VPD) control for plant propagation is presented. Recently designed and constructed lowcost chambers serve as the platform for this discussion, although results can be generalized to any other equipment in which both air temperature and humidity can be simultaneously ...
Richard S Gates
exaly   +2 more sources

Effect of vapor pressure deficit on growth and water status in muskmelon and cucumber

Plant Science, 2021
Climatic warming and water shortages have become global environmental issues affecting agricultural production. The change of morphology and anatomical structures in plant organs can greatly affect plant growth. The study combined temperature and relative humidity to regulate vapor pressure deficit (VPD) to form low and high VPD environments (LVPD and ...
Xiaoming, Song, Ping, Bai, Juping, Ding, Jianming, Li   +3 more
openaire   +2 more sources

Relative Humidity or Vapor Pressure Deficit

Ecology, 1936
Being well aware of the profound importance of evaporation as a factor affecting plants and animals, biologists are careful to regulate or observe it in experimental work. Evaporation is a dynamic process and represents the net difference between the number.
openaire   +1 more source

Vapor pressure deficit calculations and their effect on the combination equation

Agricultural and Forest Meteorology, 1989
Abstract Of the several models used to calculate potential evapotranspiration (PET), many researchers use the combination method because of its theoretical basis. This model can be affected by random errors in the input parameters (net radiation, air temperature, wind speed, and daily average vapor pressure deficit, ▿) and sensitivity analyses have ...
E.John Sadler, Dean E. Evans
openaire   +1 more source

Psychrometric and ventilation constraints for vapor pressure deficit control

Computers and Electronics in Agriculture, 2000
Constraints on air temperature, dewpoint temperature and ventilation rate in plant growth and propagation chambers under vapor pressure deficit (VPD) control are presented. These constraints apply to any controlled environment space subjected to significant radiation in which both air temperature and humidity can be simultaneously manipulated. Defining
S Zolnier, R.S Gates, J Buxton, C Mach
openaire   +1 more source

Vapor Pressure Deficit Control Algorithm for Plant Studies

IFAC Proceedings Volumes, 2000
Abstract A crop to air Vapor Pressure Deficit (VP Dcrop-air ) control algorithm was developed from analysis of energy balances on bedding plants in a sunlit plant growth chamber (SPGC). The control algorithm was implemented in the SPGC using a computer control interface, and system tests were conducted to determine the performance of individual ...
R.S. Gates, C.A. Mach
openaire   +1 more source

Occam's Razor, radiation-use efficiency, and vapor pressure deficit

Field Crops Research, 1999
Abstract Occam's Razor dictates that the hypothesis with the fewest assumptions in explaining the results is preferred. In a recent paper by Kiniry et al. (Field Crops Res. 56, 265–270, 1998), Occam's Razor was overlooked in favor of a hypothetical relationship of decreasing radiation use efficiency (RUE) with increasing vapor pressure deficit (VPD).
T R Sinclair, R C Muchow
exaly   +3 more sources

The effect of vapor pressure deficit on water use efficiency at the subdaily time scale

Geophysical Research Letters, 2014
Water use efficiency is a critical index for describing carbon-water coupling in terrestrial ecosystems. However, the nonlinear effect of vapor pressure deficit (VPD) on carbon-water coupling has not been fully considered.
Sha Zhou, Bofu Yu, Yuefei Huang
exaly   +2 more sources