scholarly journals Soil Water Balance and Vegetation Dynamics in a Semi-arid Mediterranean Ecosystem

Proceedings ◽  
2020 ◽  
Vol 30 (1) ◽  
pp. 76
Author(s):  
Ioannis N. Daliakopoulos ◽  
Ioanna Panagea ◽  
Luca Brocca ◽  
Erik van den Elsen
Keyword(s):  
Water Balance ◽  
Soil Water ◽  
Water Availability ◽  
Vegetation Dynamics ◽  
Soil Water Balance ◽  
Mediterranean Ecosystem ◽  
Limiting Factor ◽  
Arid Conditions ◽  
Water Balance Models ◽  
Semi Arid

Under arid conditions, where water availability is the limiting factor for plant survival, water balance models can be used to explain vegetation dynamics. [...]

Comparative performance of soil water balance models in computing semi-arid aquifer recharge

2013 ◽  
Vol 59 (1) ◽  
pp. 193-203 ◽  
Author(s):  
I. Touhami ◽  
J.M. Andreu ◽  
E. Chirino ◽  
J.R. Sánchez ◽  
A. Pulido-Bosch ◽  
...  
Keyword(s):  
Water Balance ◽  
Soil Water ◽  
Soil Water Balance ◽  
Aquifer Recharge ◽  
Comparative Performance ◽  
Water Balance Models ◽  
Semi Arid

Effect of different vegetation type cover on the soil water balance in semi-arid areas of South Eastern Spain

1999 ◽  
Vol 24 (4) ◽  
pp. 353-357 ◽  
Author(s):  
J. Bellot ◽  
J.R. Sanchez ◽  
E. Chirino ◽  
N. Hernandez ◽  
F. Abdelli ◽  
...  
Keyword(s):  
Water Balance ◽  
Soil Water ◽  
Vegetation Type ◽  
Soil Water Balance ◽  
Arid Areas ◽  
South Eastern ◽  
Semi Arid

The use of lysimeter data for the test of two soil-water balance models: A case study

2008 ◽  
Vol 171 (5) ◽  
pp. 762-776 ◽  
Author(s):  
Martin Wegehenkel ◽  
Yongqian Zhang ◽  
Thomas Zenker ◽  
Heiko Diestel
Keyword(s):  
Water Balance ◽  
Soil Water ◽  
Soil Water Balance ◽  
Water Balance Models

ESTIMATING PARAMETERS FOR SOIL WATER BALANCE MODELS USING ADAPTIVE SIMULATED ANNEALING

1999 ◽  
Vol 15 (6) ◽  
pp. 703-713 ◽  
Author(s):  
M. A. Calmon ◽  
J. W. Jones ◽  
D. Shinde ◽  
J. E. Specht
Keyword(s):  
Simulated Annealing ◽  
Water Balance ◽  
Soil Water ◽  
Soil Water Balance ◽  
Adaptive Simulated Annealing ◽  
Water Balance Models

Water Resources in Chile

2022 ◽  
pp. 90-100
Author(s):  
Javier Lozano Parra ◽  
Jacinto Garrido Velarde ◽  
Ignacio Aguirre
Keyword(s):  
Water Resources ◽  
Water Balance ◽  
Greenhouse Gas ◽  
Soil Water ◽  
Water Availability ◽  
Soil Water Balance ◽  
Soil Water Availability ◽  
Gas Concentration ◽  
Spatially Distributed ◽  
Soil Water Resources

This study quantifies the current and future soil water balance in a spatially distributed way for the whole of Chile and establishes what biomes will be the most affected by variations in water resources. The study of water resources reveals that 90% of surface Chile will reduce its soil water resources in the future if greenhouse gas concentration in the atmosphere does not stop. The most disadvantaged biomes are the forests, where soil water availability could decrease an average of 100 mm/year. Desert biomes could not perceive the hydrological imbalances; however, it is expected its surface increases.

scholarly journals General procedure to initialize the cyclic soil water balance by the Thornthwaite and Mather method

2010 ◽  
Vol 67 (1) ◽  
pp. 87-95 ◽  
Author(s):  
Durval Dourado-Neto ◽  
Quirijn de Jong van Lier ◽  
Klaas Metselaar ◽  
Klaus Reichardt ◽  
Donald R. Nielsen
Keyword(s):  
Water Balance ◽  
Soil Water ◽  
General Procedure ◽  
Water Storage ◽  
Dry Season ◽  
Soil Water Balance ◽  
Soil Water Storage ◽  
Wet Season ◽  
Water Balance Components ◽  
Semi Arid

The original Thornthwaite and Mather method, proposed in 1955 to calculate a climatic monthly cyclic soil water balance, is frequently used as an iterative procedure due to its low input requirements and coherent estimates of water balance components. Using long term data sets to establish a characteristic water balance of a location, the initial soil water storage is generally assumed to be at field capacity at the end of the last month of the wet season, unless the climate is (semi-) arid when the soil water storage is lower than the soil water holding capacity. To close the water balance, several iterations might be necessary, which can be troublesome in many situations. For (semi-) arid climates with one dry season, Mendonça derived in 1958 an equation to quantify the soil water storage monthly at the end of the last month of the wet season, which avoids iteration procedures and closes the balance in one calculation. The cyclic daily water balance application is needed to obtain more accurate water balance output estimates. In this note, an equation to express the water storage for the case of the occurrence of more than one dry season per year is presented as a generalization of Mendonça's equation, also avoiding iteration procedures.

scholarly journals In situ unsaturated zone water stable isotope (<sup>2</sup>H and <sup>18</sup>O) measurements in semi-arid environments: a soil water balance

2016 ◽  
Vol 20 (2) ◽  
pp. 715-731 ◽  
Author(s):  
Marcel Gaj ◽  
Matthias Beyer ◽  
Paul Koeniger ◽  
Heike Wanke ◽  
Josefina Hamutoko ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Water Balance ◽  
Soil Water ◽  
Root Zone ◽  
Soil Water Balance ◽  
Vacuum Extraction ◽  
Rain Event ◽  
Arid Environments ◽  
Semi Arid

Abstract. Stable isotopes (deuterium, 2H, and oxygen-18, 18O) of soil water were measured in the field using a liquid water isotope analyzer (tunable off-axis integrated cavity output spectroscope, OA-ICOS, LGR) and commercially available soil gas probes (BGL-30, UMS, Munich) in the semi-arid Cuvelai–Etosha Basin (CEB), Namibia. Results support the applicability of an in situ measurement system for the determination of stable isotopes in soil pore water. High spatial and temporal resolution was achieved in the study area with reasonable accuracy and measurements were in agreement with laboratory-based cryogenic vacuum extraction and subsequent cavity ring-down laser spectroscopic isotope analysis (CRDS, L2120-i, Picarro Inc.). After drift and span correction of the in situ isotope data, precision for over 140 measurements taken during two consecutive field campaigns (June and November 2014) was 1.8 and 0.48 ‰ for δ2H and δ18O, respectively. Mean measurement trueness is determined using quality check standards and was 5 and 0.3 ‰ for δ2H and δ18O, respectively. The isotope depth profiles are used quantitatively to calculate a soil water balance. The contribution of transpiration to total evapotranspiration ranged between 72 and 92 %. Shortly after a rain event, the contribution of transpiration was much lower, at 35 to 50 %. Potential limitations of such an in situ system are related to environmental conditions which could be minimized by using a temperature-controlled chamber for the laser spectrometer. Further, the applicability of the system using previously oven-dried soil material might be limited by physicochemical soil properties (i.e., clay minerals). Uncertainty in the in situ system is suggested to be reduced by improving the calibration procedure and further studying fractionation effects influencing the isotope ratios in the soil water, especially at low water contents. Furthermore, the influence of soil-respired CO2 on isotope values within the root zone could not be deduced from the data.

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