Interspecific differences in photosynthetic gas exchange characteristics and acclimation to soil moisture stress among shrubs of a semiarid grassland

Ecoscience ◽  
2009 ◽  
Vol 16 (1) ◽  
pp. 125-137 ◽  
Author(s):  
Matthew G. Letts ◽  
Lawrence B. Flanagan ◽  
K. Eric Van Gaalen ◽  
Davin R. E. Johnson
Keyword(s):  
Soil Moisture ◽  
Gas Exchange ◽  
Moisture Stress ◽  
Soil Moisture Stress ◽  
Photosynthetic Gas Exchange ◽  
Semiarid Grassland ◽  
Interspecific Differences ◽  
Gas Exchange Characteristics

scholarly journals GAS EXCHANGE AND FERN WATER POTENTIALS OF WATER-STRESSED ASPARAGUS

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1166g-1167
Author(s):  
Daniel Drost ◽  
Darlene Wilcox-Lee
Keyword(s):  
Soil Moisture ◽  
Gas Exchange ◽  
Carbon Assimilation ◽  
Moisture Stress ◽  
Carbon Dioxide Assimilation ◽  
Soil Moisture Stress ◽  
Drought Tolerant ◽  
Water Potentials ◽  
Intermediate Response ◽  
Low Levels

Asparagus is considered a relatively drought tolerant plant, but few studies are available on the gas exchange response to soil moisture stress. Seedlings were grown in the greenhouse for six months before initiation of the water stress treatments. Soils were allowed to dry to matric potentials of -0.05, -0.3 and -0.5 MPa before rewatering to pot capacity. Gas exchange and fern water potentials were measured diurnally on asparagus plants when soil matric potentials reached their minima. Decreasing soil matric potentials decreased net carbon dioxide assimilation, stomatal conductance and fern water potential. Assimilation rates (6 am) were between 3 and 5 umols m-2 s-1 for all soil moisture treatments. Carbon assimilation rates of 10, 8, and 7 umols m-2 s-1 were recorded at 10 am for the -0.05, -0.3 and -0.5 MPa soil matric potentials, respectively. Assimilation rates decreased sharply over the remainder of the day. The diurnal pattern for conductance were similar to the assimilation rates. Fern water potentials were greater in the -0.05 MPa than in the -0.5 MPa treatment for all measurement periods with an intermediate response for soil matric potentials of -0.3 MPa. Fern water potentials were highest at 6 am (-0.2 to -0.6 MPa) before declining to their minima (-1.5 to -1.8 MPa) at 10 am. Water potentials remained at these low levels throughout the day before recovering slightly at 6 pm.

Gas exchange of four arctic and alpine tundra plant species in relation to atmospheric and soil moisture stress

Oecologia ◽  
1975 ◽  
Vol 21 (2) ◽  
pp. 93-108 ◽  
Author(s):  
Douglas A. Johnson ◽  
Martyn M. Caldwell
Keyword(s):  
Soil Moisture ◽  
Gas Exchange ◽  
Plant Species ◽  
Moisture Stress ◽  
Alpine Tundra ◽  
Soil Moisture Stress

scholarly journals GAS EXCHANGE AND FERN WATER POTENTIALS OF WATER-STRESSED ASPARAGUS

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1166G-1167
Author(s):  
Daniel Drost ◽  
Darlene Wilcox-Lee
Keyword(s):  
Soil Moisture ◽  
Gas Exchange ◽  
Carbon Assimilation ◽  
Moisture Stress ◽  
Carbon Dioxide Assimilation ◽  
Soil Moisture Stress ◽  
Drought Tolerant ◽  
Water Potentials ◽  
Intermediate Response ◽  
Low Levels

Asparagus is considered a relatively drought tolerant plant, but few studies are available on the gas exchange response to soil moisture stress. Seedlings were grown in the greenhouse for six months before initiation of the water stress treatments. Soils were allowed to dry to matric potentials of -0.05, -0.3 and -0.5 MPa before rewatering to pot capacity. Gas exchange and fern water potentials were measured diurnally on asparagus plants when soil matric potentials reached their minima. Decreasing soil matric potentials decreased net carbon dioxide assimilation, stomatal conductance and fern water potential. Assimilation rates (6 am) were between 3 and 5 umols m-2 s-1 for all soil moisture treatments. Carbon assimilation rates of 10, 8, and 7 umols m-2 s-1 were recorded at 10 am for the -0.05, -0.3 and -0.5 MPa soil matric potentials, respectively. Assimilation rates decreased sharply over the remainder of the day. The diurnal pattern for conductance were similar to the assimilation rates. Fern water potentials were greater in the -0.05 MPa than in the -0.5 MPa treatment for all measurement periods with an intermediate response for soil matric potentials of -0.3 MPa. Fern water potentials were highest at 6 am (-0.2 to -0.6 MPa) before declining to their minima (-1.5 to -1.8 MPa) at 10 am. Water potentials remained at these low levels throughout the day before recovering slightly at 6 pm.

scholarly journals Interspecific Differences of the Capacities on Excessive Soil Moisture Stress for Upland Crops in Converted Paddy Field

2016 ◽  
Vol 49 (2) ◽  
pp. 157-167
Author(s):  
Ki-Yuol Jung ◽  
Young-Dae Choi ◽  
Hyen-Chung Chun ◽  
Sanghun Lee ◽  
Hang-Won Kang
Keyword(s):  
Soil Moisture ◽  
Paddy Field ◽  
Moisture Stress ◽  
Soil Moisture Stress ◽  
Interspecific Differences

scholarly journals Correlations of Vegetative and Reproductive Characters with Root Traits of Upland Rice under Imposed Soil Moisture Stress

2017 ◽  
Vol 32 (1) ◽  
pp. 61
Author(s):  
A.L Nassir ◽  
K.M. Adewusi ◽  
S.O. Olagunju
Keyword(s):  
Soil Moisture ◽  
Upland Rice ◽  
Root Traits ◽  
Moisture Stress ◽  
Soil Moisture Stress ◽  
Reproductive Characters

scholarly journals Improved understanding of drought controls on seasonal variation in Mediterranean forest canopy CO<sub>2</sub> and water fluxes through combined in situ measurements and ecosystem modelling

2009 ◽  
Vol 6 (8) ◽  
pp. 1423-1444 ◽  
Author(s):  
T. Keenan ◽  
R. García ◽  
A. D. Friend ◽  
S. Zaehle ◽  
C. Gracia ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Forest Canopy ◽  
Moisture Stress ◽  
Mediterranean Ecosystems ◽  
Forest Growth ◽  
Water Fluxes ◽  
Soil Moisture Stress ◽  
Dynamic Global Vegetation Model ◽  
Forest Growth Model

Abstract. Water stress is a defining characteristic of Mediterranean ecosystems, and is likely to become more severe in the coming decades. Simulation models are key tools for making predictions, but our current understanding of how soil moisture controls ecosystem functioning is not sufficient to adequately constrain parameterisations. Canopy-scale flux data from four forest ecosystems with Mediterranean-type climates were used in order to analyse the physiological controls on carbon and water flues through the year. Significant non-stomatal limitations on photosynthesis were detected, along with lesser changes in the conductance-assimilation relationship. New model parameterisations were derived and implemented in two contrasting modelling approaches. The effectiveness of two models, one a dynamic global vegetation model ("ORCHIDEE"), and the other a forest growth model particularly developed for Mediterranean simulations ("GOTILWA+"), was assessed and modelled canopy responses to seasonal changes in soil moisture were analysed in comparison with in situ flux measurements. In contrast to commonly held assumptions, we find that changing the ratio of conductance to assimilation under natural, seasonally-developing, soil moisture stress is not sufficient to reproduce forest canopy CO2 and water fluxes. However, accurate predictions of both CO2 and water fluxes under all soil moisture levels encountered in the field are obtained if photosynthetic capacity is assumed to vary with soil moisture. This new parameterisation has important consequences for simulated responses of carbon and water fluxes to seasonal soil moisture stress, and should greatly improve our ability to anticipate future impacts of climate changes on the functioning of ecosystems in Mediterranean-type climates.

scholarly journals Erratum: Effect of soil moisture stress from flowering to grain maturity on functional properties of Sri Lankan rice flour

2011 ◽  
Vol 63 (6) ◽  
pp. 392-392 ◽  
Author(s):  
Anil Gunaratne ◽  
Upul Kumari Ratnayaka ◽  
Nihal Sirisena ◽  
Jennet Ratnayaka ◽  
Xiangli Kong ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Functional Properties ◽  
Rice Flour ◽  
Moisture Stress ◽  
Sri Lankan ◽  
Soil Moisture Stress

scholarly journals Effect of Soil Moisture Stress Duration on the Growth Characteristics and Yield of Rice Cultivars

2016 ◽  
Vol 4 (2) ◽  
Author(s):  
Emmanuel P. Momolu ◽  
Sylvester Katuromunda ◽  
Jimmy Lamo
Keyword(s):  
Soil Moisture ◽  
Moisture Stress ◽  
Growth Characteristics ◽  
Rice Cultivars ◽  
Soil Moisture Stress
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