Dew is a major factor affecting vegetation water use efficiency rather than a source of water in the eastern Mediterranean area

2010 ◽  
Vol 46 (10) ◽  
Author(s):  
Jiftah Ben‐Asher ◽  
Pinhas Alpert ◽  
Arie Ben‐Zvi
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Eastern Mediterranean ◽  
Mediterranean Area ◽  
Use Efficiency ◽  
Vegetation Water ◽  
Eastern Mediterranean Area

Climate and vegetation water use efficiency at catchment scales

2009 ◽  
Vol 23 (16) ◽  
pp. 2409-2414 ◽  
Author(s):  
Peter A. Troch ◽  
Guillermo F. Martinez ◽  
Valentijn R. N. Pauwels ◽  
Matej Durcik ◽  
Murugesu Sivapalan ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Use Efficiency ◽  
Vegetation Water

scholarly journals Catchment-scale groundwater recharge and vegetation water use efficiency

2018 ◽  
Author(s):  
Peter A. Troch ◽  
Ravindra Dwivedi ◽  
Tao Liu ◽  
Antonio Alves Meira Neto ◽  
Tirthankar Roy ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Land Surface ◽  
Root Zone ◽  
Estimation Method ◽  
Catchment Scale ◽  
Use Efficiency ◽  
Vegetation Water ◽  
Recharge Rates

Abstract. Precipitation undergoes a two-step partitioning when it falls on the land surface. At the land surface and in the shallow subsurface, rainfall or snowmelt can either runoff as infiltration/saturation excess or quick subsurface flow. The rest will be stored temporarily in the root zone. From the root zone, water can leave the catchment as evapotranspiration or percolate further and recharge deep storage. It was recently shown that an index of vegetation water use efficiency, the Horton index (HI), could predict deep storage dynamics. Here we test this finding using 247 MOPEX catchments across the conterminous US. Our results show that the observed HI is indeed a reliable predictor of deep storage dynamics. We also find that the HI can reliably predict the long-term average recharge rate. Our results compare favorably with estimates of average recharge rates from the US Geological Survey. Previous research has shown that HI can be estimated based on aridity index, mean slope and mean elevation of a catchment (Voepel et al., 2011). We recalibrated Voepel’s model and used it to predict the HI for our catchments. We then used these predicted values of the HI to estimate average recharge rates for our catchments, and compared them with those estimated from observed HI. We find that the accuracies of our predictions based on observed and predicted HI are similar. This provides a novel estimation method of catchment-scale long-term average recharge rates based on simple catchment characteristics, such as climate and topography, and free of discharge measurements.

scholarly journals Response of onion crop to bulb set size and planting date under mulching in dry Mediterranean environment

2021 ◽  
Vol 117 (3) ◽  
pp. 1
Author(s):  
Ibrahim MUBARAK
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Crop Production ◽  
Mediterranean Area ◽  
Planting Date ◽  
Planting Dates ◽  
Irrigation Water Use Efficiency ◽  
Set Size ◽  
Irrigation Water Use ◽  
Use Efficiency

<p class="042abstractstekst">The present pot experiment under open field conditions was conducted to evaluate the response of onion crop to bulb set size and planting date using mulching. Two different sizes of onion sets at planting (large (6-10 g) and small (2-6 g)) and three different planting dates (February, March, and April) with two soil coverings (with and without straw mulching) were tested. Treatments were replicated three times. Onion was not exposed to any drought stress during the course of the experiment.<br />Results indicated that the larger bulb sets which were planted earlier under mulching, maximised the total bulb yield (Yield, 44.0 t ha<sup>-1</sup>), water use efficiency (WUE, 8.37 kg m<sup>-3</sup>), and irrigation water use efficiency (IWUE, 9.57 kg m<sup>-3</sup>). Moreover, findings revealed that onion crop appreciably respond to smaller bulb sets when they were planted earlier under mulching. Onion bulb responses were predicted to be linearly increased with the earliness in planting date, with an obvious better preference under mulching and heavier bulb sets. Hence, adopting early planting date with mulching is suggested for sustainable crop production and for enhancing water use efficiency in dry Mediterranean area.</p>

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