Seasonal changes in the water use strategies of three co-occurring desert shrubs

2013 ◽  
Vol 28 (26) ◽  
pp. 6265-6275 ◽  
Author(s):  
Yu Wu ◽  
Hai Zhou ◽  
Xin-Jun Zheng ◽  
Yan Li ◽  
Li-Song Tang
Keyword(s):  
Water Use ◽  
Seasonal Changes ◽  
Desert Shrubs

Influences of Seasonal Changes in Leaf Morphology on Water-Use Efficiency For Three Desert Broadleaf Shrubs

Ecology ◽  
1977 ◽  
Vol 58 (5) ◽  
pp. 1033-1043 ◽  
Author(s):  
William K. Smith ◽  
Park S. Nobel
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Seasonal Changes ◽  
Leaf Morphology ◽  
Use Efficiency

Seasonal water use patterns of semi-arid plants in China

2013 ◽  
Vol 89 (02) ◽  
pp. 169-177 ◽  
Author(s):  
Guodong Jia ◽  
Xinxiao Yu ◽  
Wenping Deng
Keyword(s):  
Water Use ◽  
Seasonal Changes ◽  
Water Sources ◽  
Plant Water ◽  
Seasonally Dry ◽  
Use Patterns ◽  
Different Seasons ◽  
Water Use Patterns ◽  
Plant Water Sources ◽  
Semi Arid

Water sources of woody plants in semi-arid or seasonally dry areas of China are little known. This study investigated the differences in water sources for plants due to seasonal changes (wet/transitional and dry seasons) in semi-arid areas. Stable isotope techniques were applied to determine plant water sources in different seasons. The results show that there is generally a switch of water sources from shallow depths in the rainy season to lower depths in the dry season. This study highlights how seasonal changes in climate in semi-arid China affect plant water uptake and suggests that further study with replicated systematic experiments are needed to better understand the responses in water use patterns to changes in environmental conditions in drought-prone areas.

Water use of two Mojave Desert shrubs under elevated CO2

2000 ◽  
Vol 6 (8) ◽  
pp. 889-897 ◽  
Author(s):  
D. E. Pataki ◽  
T. E. Huxman ◽  
D. N. Jordan ◽  
S. F. Zitzer ◽  
J. S. Coleman ◽  
...  
Keyword(s):  
Elevated Co2 ◽  
Water Use ◽  
Mojave Desert ◽  
Desert Shrubs

Relationships between carbon isotope discrimination, water use efficiency and transpiration efficiency for dryland wheat

1993 ◽  
Vol 44 (8) ◽  
pp. 1693 ◽  
Author(s):  
AG Condon ◽  
RA Richards ◽  
GD Farquhar
Keyword(s):  
Water Use Efficiency ◽  
Soil Water ◽  
Water Use ◽  
Negative Correlation ◽  
Seasonal Changes ◽  
Dry Matter ◽  
Carbon Isotope Discrimination ◽  
Transpiration Efficiency ◽  
Use Efficiency ◽  
The Relationship

Carbon isotope discrimination (-) has been shown to be negatively correlated with water use efficiency for wheat cultivars grown in the glasshouse. In the field this negative correlation has been confirmed for peanut but it has yet to be confirmed for wheat. Indeed, several field studies on wheat have shown positive (rather than negative) relationships between dry matter production and -. The aim of this study was to determine the relationship between - and water use efficiency for wheat grown in a dryland environment characterized by winterlspring-dominant rainfall and terminal drought. Eight genotypes chosen to give a range in - of c. 2.0x10-3 were grown on a red earth at Moombooldool in the Riverina region of New South Wales. Water use and above-ground dry matter (DM) were measured over the course of the season. Water use was partitioned into transpiration and soil evaporation and values of crop water use efficiency (WET) and transpiration efficiency ( WT) calculated. To account for the effect on WT of seasonal changes in the vapour pressure deficit of the air (D), crop coefficients (k) were derived by multiplying WT by the transpiration-weighted average daytime value of D for each genotype. During the preanthesis period, when there was little limitation of soil water supply on growth, there was a positive relationship between DM and -, as observed previously. The relationship between WET and - also had a positive (though non-significant) trend, but the relationship between k and - was negative, i.e. once the effects of variation in the ratio T/ET and seasonal changes in D were accounted for, the negative correlation between water use efficiency and - re-emerged. This apparent conflict between WET and k arose because genotypes with high - values developed their leaf area faster, with two important consequences. First, high - genotypes transpired more of their water supply during the winter when D was low and the exchange of water for CO2 more efficient. Second, transpiration made up a greater proportion of total water use by high - genotypes. The relationship between water use efficiency and - was further complicated as the crops depleted the soil water store after anthesis. During this period DM production tended to be greater in low - genotypes that had conserved soil water in the preanthesis period. However, DM production also remained high for two high - genotypes. The cause of this variation in post-anthesis growth among high - genotypes was not established.

scholarly journals Seasonal changes in water use of ash trees exposed to ozone episodes

1994 ◽  
Vol 127 (2) ◽  
pp. 349-354 ◽  
Author(s):  
J.J.J. WILTSHIRE ◽  
M. H. UNSWORTH ◽  
C. J. WRIGHT
Keyword(s):  
Water Use ◽  
Seasonal Changes ◽  
Ash Trees ◽  
Ozone Episodes
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