Management regimes affect woody plant productivity and water use efficiency in an urban desert ecosystem

2008 ◽  
Vol 11 (2) ◽  
pp. 197-211 ◽  
Author(s):  
L. Brooke Stabler
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Woody Plant ◽  
Plant Productivity ◽  
Desert Ecosystem ◽  
Management Regimes ◽  
Use Efficiency

scholarly journals Reducing the Excessive Evaporative Demand Improved the Water-use Efficiency of Greenhouse Cucumber by Regulating the Trade-off between Irrigation Demand and Plant Productivity

HortScience ◽  
2018 ◽  
Vol 53 (12) ◽  
pp. 1784-1790 ◽  
Author(s):  
Dalong Zhang ◽  
Yuping Liu ◽  
Yang Li ◽  
Lijie Qin ◽  
Jun Li ◽  
...  
Keyword(s):  
Water Stress ◽  
Water Use Efficiency ◽  
Water Flow ◽  
Water Use ◽  
Plant Productivity ◽  
Plant Water ◽  
Evaporative Demand ◽  
Plant Water Stress ◽  
Irrigation Demand ◽  
Use Efficiency

Although atmospheric evaporative demand mediates water flow and constrains water-use efficiency (WUE) to a large extent, the potential to reduce irrigation demand and improve water productivity by regulating the atmospheric water driving force is highly uncertain. To bridge this gap, water transport in combination with plant productivity was examined in cucumber (Cucumis sativus L.) grown at contrasting evaporative demand gradients. Reducing the excessive vapor pressure deficit (VPD) decreased the water flow rate, which reduced irrigation consumption significantly by 16.4%. Reducing excessive evaporative demand moderated plant water stress, as leaf dehydration, hydraulic limitation, and excessive negative water potential were prevented by maintaining water balance in the low-VPD treatment. The moderation of plant water stress by reducing evaporative demand sustained stomatal function for photosynthesis and plant growth, which increased substantially fruit yield and shoot biomass by 20.1% and 18.4%, respectively. From a physiological perspective, a reduction in irrigation demand and an improvement in plant productivity were achieved concomitantly by reducing the excessive VPD. Consequently, WUE based on the criteria of plant biomass and fruit yield was increased significantly by 43.1% and 40.5%, respectively.

scholarly journals A Review of Modeled Water Use Efficiency of Highly Productive Perennial Grasses Useful for Bioenergy

Agronomy ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 328 ◽  
Author(s):  
James R. Kiniry ◽  
Sumin Kim
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Plant Biomass ◽  
Plant Productivity ◽  
Perennial Grasses ◽  
Radiation Use Efficiency ◽  
Whole Plant ◽  
Daily Water ◽  
Use Efficiency ◽  
Radiation Use

Whole plant productivity is obviously the ultimate product of leaf photosynthesis and this has led to numerous efforts to relate the two. However, often with perennial grasses, plant productivity is more sink-limited than source-limited, causing the linkage between the photosynthetic rate and productivity to be weak or nonexistent. This has led to a different approach, characterizing plant productivity in terms of the efficiency of intercepted light use in producing biomass, also called radiation use efficiency. Likewise, the efficiency of the use of water to produce plant biomass, or water use efficiency, has been the object of much interest. The use of a simulation model to quantify biomass, using radiation use efficiency in parallel with a daily water balance simulation, allows for the effective calculation of water use efficiency. In this project, the process of determining radiation use efficiency with field data is described, as well as example values for highly productive perennial grasses useful for feedstock for bioenergy. In addition, values of water use efficiency for these grasses are reported and compared with other perennial grasses and common cultivated crops.

Differential response of δ13C and water use efficiency to arbuscular mycorrhizal infection in two aridland woody plant species

Oecologia ◽  
2003 ◽  
Vol 135 (4) ◽  
pp. 510-515 ◽  
Author(s):  
José Ignacio Querejeta ◽  
José Miguel Barea ◽  
Michael F. Allen ◽  
Fuensanta Caravaca ◽  
Antonio Roldán
Keyword(s):  
Water Use Efficiency ◽  
Plant Species ◽  
Water Use ◽  
Woody Plant ◽  
Arbuscular Mycorrhizal ◽  
Differential Response ◽  
Mycorrhizal Infection ◽  
Woody Plant Species ◽  
Use Efficiency

scholarly journals Evaluating the response of ẟ<sup>13</sup>C in <i>Haloxylon ammodendron</i>, a dominant C<sub>4</sub> species in Asian desert ecosystem, to water and nitrogen addition as well as the availability of its ẟ<sup>13</sup>C as the indicator of water use-efficiency

2020 ◽  
Author(s):  
Zixun Chen ◽  
Xuejun Liu ◽  
Xiaoqing Cui ◽  
Yaowen Han ◽  
Guoan Wang ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Water Use Efficiency ◽  
Water Use ◽  
N Deposition ◽  
Desert Ecosystem ◽  
N Availability ◽  
Water Addition ◽  
Haloxylon Ammodendron ◽  
Atmospheric N Deposition ◽  
Use Efficiency

Abstract. Variations in precipitation and atmospheric N deposition affect water and N availability in desert, and thus may have significant effects on desert ecosystems. Haloxylon ammodendron is a dominant plant in Asian desert, and addressing its physiological acclimatization to the changes in precipitation and N deposition can provide an insight into how desert plants adapt extreme environment by physiological adjustment. Carbon isotope ratio (ẟ13C) in plants has been suggested as a sensitive long-term indicator of physiological acclimatization. Therefore, this study evaluated the effect of precipitation change and increasing atmospheric N depositon on ẟ13C of H. ammodendron. Furthermore, Haloxylon ammodendron is a C4 plant, whether its ẟ13C can indicate water use-efficiency (WUE) has not been addressed. In the present study, we designed a field experiment with a completely randomized factorial combination of N and water, and measured ẟ13C, gas exchange and WUE of the assimilating branches of H. ammodendron. ẟ13C in H. ammodendron remained stable under N and water supply, while N addition, water addition and their interaction affected gas exchange and WUE in H. ammodendron. In addition, ẟ13C had no correlation with WUE. This result are associated with the irrelevance between ẟ13C and ci/ca, which might be caused by a special value (0.37) of the degree of bundle-sheath leakiness (φ) or a lower activity of carbonic anhydrase (CA) of H. ammodendron. Thus, ẟ13C of H. ammodendron cannot be used for indicating its WUE.

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