Results 151 to 160 of about 39,409 (173)

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
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EFFECT OF VAPOR PRESSURE DEFICIT ON SPINACH GROWTH UNDER HYPOBARIC CONDITIONS

Acta Horticulturae, 1996
The effect of vapor pressure deficit (VPD) of air during photoperiod on spinach growth under low total pressure was examined. Spinach plants grown under atmospheric pressure were transplanted into a pressure-reduced growth chamber and cultured hydroponically for eight days.
K, Iwabuchi, G, Saito, E, Goto, T, Takakura   +3 more
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Vegetational Correlations with Vapor Pressure Deficit and Relative Humidity

American Midland Naturalist, 1942
Ecologists have long attempted to single out critical environmental factors for use in distributional, successional, and other ecological studies. Temperature and relative humidity have been foremost in consideration. In recent years the importance of relative humidity, and even of temperature, has been minimized.
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Downscaling Vapor Pressure Deficit across Complex Forested Terrain

Journal of Applied Meteorology and Climatology
Abstract The forest microclimate shapes many aspects of forest functioning, including plant regeneration and wildfire occurrence. In complex landscapes with varying terrain, the forest microclimate varies at fine spatial scales (10–100 m2). However, accurately mapping this variation remains challenging.
Jamie E. Burton, Bianca J. Pickering, Trent D. Penman, Jane G. Cawson   +3 more
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Comparison of Vapor-Pressure-Deficit Calculation Methods—Southern High Plains

Journal of Irrigation and Drainage Engineering, 1995
Vapor-pressure deficit ( VPD ) affects evapotranspiration, water-use efficiency, and radiation-use efficiency of crops. VPD calculation methods were evaluated for a semiarid environment in the Southern Great Plains. Air temperature and relative humidity were measured near Bushland, Texas, during 1992 and 1993.
Terry A. Howell, Donald A. Dusek
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Limited-Transpiration Rate Under Elevated Atmospheric Vapor Pressure Deficit

2017
The driving force of transpiration rate is the gradient in vapor pressure between the dry atmosphere and the wet interior of leaves, commonly referred to as the vapor pressure deficit (VPD). The other key variable is the resistance to vapor diffusion from the leaves attributed to the aperture of the stomata pores. Partial stomatal closure at modest VPD
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The functional dependence of canopy conductance on water vapor pressure deficit revisited

International Journal of Biometeorology, 2018
Current research seeking to relate between ambient water vapor deficit (D) and foliage conductance (gF) derives a canopy conductance (gW) from measured transpiration by inverting the coupled transpiration model to yield gW = m - n ln(D) where m and n are fitting parameters. In contrast, this paper demonstrates that the relation between coupled gW and D
Fuchs, Marcel, Stanghellini, Cecilia
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Increasing vapor pressure deficit accelerates land drying

Journal of Hydrology, 2023
Shijie Li, Guojie Wang, Yuanfang Chai, Lijuan Miao, Daniel Fiifi Tawia Hagan, Shanlei Sun, Jinlong Huang, Buda Su, Tong Jiang, Tiexi Chen, Chuhan Lu, Zhaoyong Guan   +11 more
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Atmospheric Pressure Effect on Vapor Pressure Deficit and Potential Moisture Loss from Horticultural Commodities

Transactions of the ASAE, 1981
ABSTRACT AN analytical investigation of the effect of atmos-pheric pressure level on air-water psyohrometric re-lationships is reported. Vapor pressure deficit (VPD) is shown to be essentially independent of atmospheric pressure level in the range of atmospheric pressures nor-mally encountered in postharvest handling of horticul-tural commodities ...
null Lee R. Erickson, null Roger E Garrett   +1 more
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Atmospheric Vapor Pressure Deficit Outweighs Soil Moisture Deficit in Controlling Global Ecosystem Water Use Efficiency

Journal of Geophysical Research: Biogeosciences
AbstractHigh vapor pressure deficit (VPD) and low soil moisture (SM) lead to soil and atmospheric droughts, which can stress carbon‐water coupling in terrestrial ecosystems. However, the strong collinearity between VPD and SM, particularly under certain climatic conditions, makes it challenging to disentangle their independent contributions to carbon ...
Chao Li, Dahong Zhang, Shiqiang Zhang, Yanan Wen, Wenhui Wang, Youdong Chen, Jian Peng   +6 more
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