The use of canopy temperature as an indicator of drought stress in humid regions

Keener, M. E.; Kircher, Patrick

doi:10.1016/0002-1571(83)90010-9

Cited by 44 publications

(20 citation statements)

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“…Our results are also confirmed by the conclusions of KEENER and KIRCHER (1983), who recommended in humid conditions for the reason of high variability of saturation deficit and radiation balance to include also saturation deficit and/or radiation balance in the evaluation of water stress besides the difference between canopy and air temperature. In the peak growing season (June-August) the grassland was frequently (except in 2005) affected 5/6/03 6:00 5/6/03 12:00 5/6/03 18:00 6/6/03 0:00 6/6/03 6:00 6/6/03 12:00 6/6/03 18:00 7/6/03 0:00 7/6/03 6:00 7/6/03 12:00 7/6/03 18:00 8/6/03 0:00 8/6/03 6:00 8/6/03 12:00 8/6/03 18:00 9/6/03 0:00 …”

Section: Resultssupporting

confidence: 89%

“…By an easy measurement of surface temperature with infrared sensors it is possible to use this important indicator for determination of plant water stress and/or of the rate of actual evapotranspiration because a difference between the temperature of air and that of canopy (temperature difference) is a generally accepted indicator of water availability to plants (e.g. JACKSON et al 1977JACKSON et al , 1981KEENER & KIRCHER 1983;PAW U 1984, andOLUFAYO et al 1994). In the period of water stress temperature difference is influenced not only by the increasing surface resistance to water vapour transmission due to the closure of stomata but also by other factors limiting the use of this proposed indicator.…”

mentioning

confidence: 99%

“…by the canopy structure through the occurrence of non-transpiring dead plant residues and voids at the beginning of spring. Vapour pressure deficit is another important evaluation criterion contributing to the definition of water stress on the basis of the difference between canopy (T c ) and air temperature (T a ) in the conditions of humid climate (KEENER & KIRCHER 1983); this deficit and radiation balance are very variable in such conditions. The negative linear relation of T c -T a to vapour pressure deficit (VPD) under unlimited availability of soil water to plants (so called baseline) was included in the computation of the crop water stress index JACKSON et al 1981) which indicates to what extent the crop suffers from water stress.…”

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confidence: 99%

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Difference in Canopy and Air Temperature as an Indicator of Grassland Water Stress

Duffková¹

2006

Soil & Water Res.

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: In 2003 in conditions of the moderately warm region of the Třeboň Basin (Czech Republic) the difference between canopy temperature (T c ) and air temperature at 2 m (T a ) was tested as an indicator of grassland water stress. To evaluate water stress ten-minute averages of temperature difference T c -T a were chosen recorded on days without rainfall with intensive solar radiation from 11.00 to 14.00 CET. Water stress in the zone of the major portion of root biomass (0-0.2 m) in the peak growing season (minimum presence of dead plant residues) documented by a sudden increase in temperature difference, its value 5-12°C and unfavourable canopy temperatures due to overheating (> 30°C) was indicated after high values of suction pressure approaching the wilting point (1300 kPa) were reached. High variability of temperature difference in the conditions of sufficient supply of water to plants was explained by the amount of dead plant residues in canopy, value of vapour pressure deficit (VPD), actual evapotranspiration rate (ETA) and soil moisture content. At the beginning of the growing season (presence of dead plant residues and voids) we proved moderately strong negative linear correlations of T c -T a with VPD and T c -T a with ETA rate and moderately strong positive linear correlations of ETA rate with VPD. In the period of intensive growth (the coverage of dead plant residues and voids lower than 10%) moderately strong linear correlations of T c -T a with VPD and multiple linear correlations of T c -T a with VPD and soil moisture content at a depth of 0.10-0.40 m were demonstrated.

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Section: Resultssupporting

confidence: 89%

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confidence: 99%

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confidence: 99%

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Difference in Canopy and Air Temperature as an Indicator of Grassland Water Stress

Duffková¹

2006

Soil & Water Res.

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“…The mean TD from 6 readings per plant was first divided by the mean TD of the representative cluster and then multiplied by the mean TD per plant to obtain a corrected TD value for the plant. This ensured minimal deviation from the actual raw TD, while achieving the versatility required to reduce the error variance (Kaufman and Rousseeuw 2009) associated with instantaneous ambient temperature fluctuations within a day's data collection window. The corrected TD correlated positively (r = 0.94) with the raw TD data, and was applied in the subsequent regression analyses.…”

Section: Statistical Transformation For Qtl Analysismentioning

confidence: 99%

QTL mapping and loci dissection for leaf epicuticular wax load and canopy temperature depression and their association with QTL for staygreen in Sorghum bicolor under stress

et al. 2017

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Plant waxes and staygreen are distinct phenotypic traits that have been independently implicated in heat and drought tolerance among grasses. The association between these two traits has not been fully explored, which makes the exploitation of synergy between them difficult. This study assessed the association between QTL regulating the staygreen (Stg) trait in sorghum and those regulating epicuticular wax load (WL) and associated canopy temperature depression (TD). Using a recombinant inbred line (RIL) population derived from Tx642 and Tx7000, phenotypic data were collected in three replicated field trials and one greenhouse trial. High absolute TD generally corresponded to high WL. The r 2 of TD against WL was highest under non-stress conditions in the greenhouse while it was much larger in the cooler and irrigated field conditions compared to hotter, drier field trials. The genetic correlations between the two traits also followed this pattern. Composite interval mapping identified a total of 28 QTL, 15 of which had significant overlaps between different traits. Most of the wax QTL were associated with pre-anthesis drought tolerant Tx7000. However, one QTL for WL overlapped with a QTL for staygreen (Stg2) and was represented by a single, isolated marker near the centromeric region on the short arm of SBI-01. The marker is identified by a Cis-acting regulatory module and is part of a 2-kb multifunctional motif-rich region which includes core promoter and enhancer regions and transcription elements, including a droughtresponsive MYB binding site. We suggest that this QTL may be pleiotropic for important stress tolerance mechanisms regulating both staygreen and leaf wax in sorghum.

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“…40 Jackson et al (1981 modified the CWSI to include a more theoretical prediction of climate effects on canopy temperature which includes explicitly the role of net radiation vapour pressure deficit and aerodynamic resistance. This theoretical approach to determining water stress using the CWSI is superior to the empirical approach, especially in more humid climates (Keener & Kircher 1983).…”

Section: Introductionmentioning

confidence: 98%

Quantifying drought for humid, temperate pastures using the Crop Water Stress Index (CWSI)

Feldhake¹,

Glenn

Edwards

et al. 1997

New Zealand Journal of Agricultural Research

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Pastures benefit from changes in management during periods of drought; therefore, better methods of quantifying drought would be useful. This research was conducted to determine how values of the Crop Water Stress Index (CWSI) related to measured reductions in evapotranspiration (ET) by pasture as a result of water stress. Evapotranspiration by cocksfoot was measured using a large weighing lysimeter at Coshocton, Ohio, during 1988, a very dry year, and 1989, a wet one. Evapotranspiration by cocksfoot and tall fescue was measured during 1993, at Kearneysville, West Virginia, using two large weighing lysimeters with drought simulated during the latter part of the growing season using rain-out shelters. Net radiation, wind speed, air temperature, humidity, and canopy temperature were measured at both locations to calculate potential ET and the CWSI. The relationship between CWSI and relative ET (actual divided by potential ET) was curvilinear and differed between cocksfoot and tall fescue. Under very dry conditions, the CWSI exceeded values which have been reported as the maximum for field crops. While the CWSI has the potential to be a useful tool for quantifying pasture water stress, there is a species dependency that will require further analysis.

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The use of canopy temperature as an indicator of drought stress in humid regions

Cited by 44 publications

References 20 publications

Difference in Canopy and Air Temperature as an Indicator of Grassland Water Stress

Difference in Canopy and Air Temperature as an Indicator of Grassland Water Stress

QTL mapping and loci dissection for leaf epicuticular wax load and canopy temperature depression and their association with QTL for staygreen in Sorghum bicolor under stress

Quantifying drought for humid, temperate pastures using the Crop Water Stress Index (CWSI)

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