Effects of tussock size and soil water content on whole plant gas exchange in Stipa tenacissima L.: Extrapolating from the leaf versus modelling crown architecture

2008 ◽  
Vol 62 (3) ◽  
pp. 376-388 ◽  
Author(s):  
David A. Ramírez ◽  
Fernando Valladares ◽  
Adela Blasco ◽  
Juan Bellot
Keyword(s):  
Gas Exchange ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Crown Architecture ◽  
Stipa Tenacissima ◽  
Whole Plant ◽  
Plant Gas Exchange

The responses of stomata and leaf gas exchange to vapour pressure deficits and soil water content

Oecologia ◽  
1985 ◽  
Vol 65 (3) ◽  
pp. 356-362 ◽  
Author(s):  
T. Gollan ◽  
N. C. Turner ◽  
E. -D. Schulze
Keyword(s):  
Gas Exchange ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Vapour Pressure ◽  
Leaf Gas Exchange

The responses of stomata and leaf gas exchange to vapour pressure deficits and soil water content

Oecologia ◽  
1984 ◽  
Vol 63 (3) ◽  
pp. 338-342 ◽  
Author(s):  
Neil C. Turner ◽  
E.-D. Schulze ◽  
T. Gollan
Keyword(s):  
Gas Exchange ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Vapour Pressure ◽  
Leaf Gas Exchange

Young lime tree evapotranspiration measurements in lysimeters with automated irrigation

2021 ◽  
Author(s):  
Ana belén Mira-García ◽  
Juan Vera ◽  
Wenceslao Conejero ◽  
Mª Carmen Ruiz-Sánchez
Keyword(s):  
Gas Exchange ◽  
Water Balance ◽  
Water Content ◽  
Soil Water ◽  
Real Time ◽  
Soil Water Content ◽  
Water Status ◽  
Soil Water Balance ◽  
Crop Evapotranspiration ◽  
Lime Tree

<p>Lime tree growing area is increasing in Mediterranean temperate regions. In these areas, climate change scenario is expected to raise air temperature and water shortages. Such scenario requires new approaches to implement a precision irrigation in agriculture. In order to use water more efficiently, it becomes necessary to accurately determining the crop water needs, which are estimated by crop evapotranspiration computations (ETc). In this study the ETc of young lime trees grown under Mediterranean conditions were determined using the soil water balance method. For this purpose, two-year old lime trees (Citrus latifolia Tan., cv. Bearss) grafted on C. macrophylla rootstock were cultivated in pot-lysimeters, equipped with capacitance and granular matric sensors for real-time monitoring of the soil water status. Irrigation, drainage, and pot weight were also monitored continuously. All measurements were integrated into a telemetry platform. Agro-meteorological variables, plant water status (stem (Ψ<sub>stem</sub>) and leaf (Ψ<sub>leaf</sub>) water potentials), and leaf gas exchange parameters (stomatal conductance (g<sub>s</sub>) and net photosynthesis (P<sub>n</sub>)) were measured. Along the experiment, an automated irrigation protocol based on volumetric soil water content (θ<sub>v</sub>) threshold values were programmed, guaranteeing an adequate lime tree water status. Irrigation dose was calculated based on a feed-back strategy maintaining θ<sub>v </sub>within 30% management allowed depletion.</p><p>During the experimental period, the lime trees were well irrigated as revealed midday Ψ<sub>stem </sub>values that were maintained above -0.8 MPa. Also, the mean seasonal values of ≈ 7 µmol m<sup>−2</sup> s<sup>−1</sup> and 80 mmol m<sup>−2</sup> s<sup>−1</sup>, for P<sub>n</sub> and g<sub>s</sub>, respectively, indicated optimal gas exchange values. The computed water balance parameters yielded values for the crop evapotranspiration from 0.25<sup></sup>to 2.56 mm day<sup>-1</sup>, in winter and summer months, respectively, with maximum values in July when evaporative demand conditions were the highest. This soil water balance was daily validated by the pot weight balance through the year.</p><p>In conclusion, the automated irrigation of young potted lime trees, using soil water content as a control system variable, has ensured an adequate lime tree water status. A simple, robust weighing/drainage lysimeter, with real-time monitoring of the soil water balance parameters, has been proved practical and economical tool for crop evapotranspiration measurements.</p><p>Acknowledgments: This work was funded by Spanish Agencia Estatal de Investigación (PID2019-106226RB-C2-1/AEI/10.13039/501100011033) and Fundación Séneca, Región de Murcia (19903/GERM/15) projects.</p>

Inter- and under-canopy soil water, leaf-level and whole-plant gas exchange dynamics of a semi-arid perennial C4 grass

Oecologia ◽  
2010 ◽  
Vol 165 (1) ◽  
pp. 17-29 ◽  
Author(s):  
Erik P. Hamerlynck ◽  
Russell L. Scott ◽  
M. Susan Moran ◽  
Andrea M. Schwander ◽  
Erin Connor ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Soil Water ◽  
C4 Grass ◽  
Canopy Soil ◽  
Whole Plant ◽  
Leaf Level ◽  
Semi Arid ◽  
Plant Gas Exchange

Response of wheat canopy CO2 and water gas-exchange to soil water content under ambient and elevated CO2

2001 ◽  
Vol 7 (5) ◽  
pp. 599-611 ◽  
Author(s):  
Rowan A. C. Mitchell ◽  
Valerie J. Mitchell ◽  
David W. Lawlor
Keyword(s):  
Gas Exchange ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Elevated Co2 ◽  
Water Gas

The responses of stomata and leaf gas exchange to vapour pressure deficits and soil water content

Oecologia ◽  
1985 ◽  
Vol 65 (3) ◽  
pp. 348-355 ◽  
Author(s):  
Neil C. Turner ◽  
E. -D. Schulze ◽  
T. Gollan
Keyword(s):  
Gas Exchange ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Vapour Pressure ◽  
Leaf Gas Exchange

scholarly journals Stomatal and Cuticular Transpiration of Greenhouse Tomato Plants in Response to High Solution Electrical Conductivity and Low Soil Water Content

1995 ◽  
Vol 120 (3) ◽  
pp. 417-422 ◽  
Author(s):  
Hui-lian Xu ◽  
Laurent Gauthier ◽  
André Gosselin
Keyword(s):  
Electrical Conductivity ◽  
Gas Exchange ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Stomatal Closure ◽  
Tomato Plants ◽  
Cuticular Transpiration ◽  
Decline Curve ◽  
Gas Exchange System

`Capello' tomato plants (Lycopersicon esculentum Mill.) were grown in a greenhouse in peat-based substrate (70% sphagnum peat and 309'. perlite, by volume) and supplied with nutrient solutions of high (4.5 mS·cm-1) or low (2.3 mS·cm-1) electrical conductivity (EC) under high (95% ± 5%) or low (55% ± 8% of capillary capacity) soil water conditions. Three weeks after treatments started, stomatal transpiration (TRst) and cuticular transpiration (TRcu) rates were measured by three methods: 1) analyzing TRst and TRcu from a water retention curve obtained by drying excised leaves in air under a photosynthetic photon flux (PPF) of 400 μmol·m-1·s-1, 2) analyzing TRst and TRcu from a transpiration decline curve obtained by measuring transpiration rates after cutting the leaf from the stem of the dehydrated plant in the gas-exchange system, and 3) measuring transpiration rates under light and in dark respectively using the gas-exchange method. TRst and TRcu were decreased by high EC and/or low soil water content. For method 1, the transpiration decline curve shows two distinct phases: the initial steep slope that indicates TRst and the gently sloped section that indicates TRcu. Both slopes were lower for high EC and/or water-stressed plants compared to the control (low EC and high soil water content). The tangent lines of these two phases of the curve intersect at one point (t, w). The value oft that indicates the time for stomatal closure was longer and the value of w that indicates the critical tissue water level for stomatal closure was lower for high EC and/or water-stressed plants. In method 2, the initial rate of total transpiration was higher in high EC and/or water-stressed plants. Leaf wax content increased, especially under high EC stress. This suggests that increased deposition of wax prevents water loss from the cuticle. A delay in complete stomatal closure, complete closure at lower RWC, and reduced TRcu or an increase in wax deposit were adaptations to water and salinity stresses in tomato plants under our controlled environmental conditions.

SOIL WATER CONTENT AFFECTS THE AVAILABILITY OF PHOSPHATE

1985 ◽  
pp. 185-189
Author(s):  
M.C.H.Mouat Pieter Nes
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Soil Solution ◽  
Equivalent Reduction

Reduction in water content of a soil increased the concentration of ammonium and nitrate in solution, but had no effect on the concentration of phosphate. The corresponding reduction in the quantity of phosphate in solution caused an equivalent reduction in the response of ryegrass to applied phosphate. Keywords: soil solution, soil water content, phosphate, ryegrass, nutrition.

Sign in / Sign up

Export Citation Format

Share Document