Soil Water dynamics and water balance on a coral island: Zhaoshu Island, Xisha Archipelago

AbstractAccurate estimation of the soil water balance of the soil-plant-atmosphere system is key to determining the availability of water resources and their optimal management. Evapotranspiration and leaching are the main sinks of water from the system affecting soil water status and hence crop yield. The accuracy of soil water content and evapotranspiration simulations affects crop yield simulations as well. DSSAT is a suite of field-scale, process-based crop models to simulate crop growth and development. A “tipping bucket” water balance approach is currently used in DSSAT for soil hydrologic and water redistribution processes. By comparison, HYDRUS-1D is a hydrological model to simulate water flow in soils using numerical solutions of the Richards equation, but its approach to crop-related process modeling is rather limited. Both DSSAT and HYDRUS-1D have been widely used and tested in their separate areas of use. The objectives of our study were: (1) to couple HYDRUS-1D with DSSAT to simulate soil water dynamics, crop growth and yield, (2) to evaluate the coupled model using field experimental datasets distributed with DSSAT for different environments, and (3) to compare HYDRUS-1D simulations with those of the tipping bucket approach using the same datasets. Modularity in the software design of both DSSAT and HYDRUS-1D made it easy to couple the two models. The pairing provided the DSSAT interface an ability to use both the tipping bucket and HYDRUS-1D simulation approaches. The two approaches were evaluated in terms of their ability to estimate the soil water balance, especially soil water contents and evapotranspiration rates. Values of thedindex for volumetric water contents were 0.9 and 0.8 for the original and coupled models, respectively. Comparisons of simulations for the pod mass for four soybean and four peanut treatments showed relatively highdindex values for both models (0.94–0.99).

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Hydrodynamic changes of the soil-cactus interface, effective actual evapotranspiration and its water efficiency under irrigation

Revista Brasileira de Engenharia Agrícola e Ambiental ◽

10.1590/1807-1929/agriambi.v21n4p273-278 ◽

2017 ◽

Vol 21 (4) ◽

pp. 273-278 ◽

Cited By ~ 3

Author(s):

José E. F. de Morais ◽

Thieres G. F. da Silva ◽

Maria G. de Queiroz ◽

Gherman G. L. de Araújo ◽

Magna S. B. Moura ◽

...

Keyword(s):

Water Balance ◽

Soil Water ◽

Water Dynamics ◽

Soil Water Balance ◽

Actual Evapotranspiration ◽

Water Efficiency ◽

Economic Returns ◽

Soil Water Dynamics ◽

Irrigation Depth ◽

Efficiency Indicators

ABSTRACT The knowledge on soil water dynamics is the basis of crop water management. The soil water balance (SWB) method is used for this purpose. However, its application in cactus may lead to misinterpretation in water efficiency analysis, since it does not consider the amount of water retained in the plant (WRP). This study aimed to evaluate SWB applicability, hydrodynamic changes and water efficiency of forage cactus clones under irrigation. The clones ‘Orelha de Elefante Mexicana’ (OEM), ‘IPA Sertânia’ (IPA) and ‘Miúda’ (MIU) were submitted to irrigation depths (2.5, 5.0 and 7.5 mm) and frequencies (7, 14 and 28 days), in Serra Talhada, PE, Brazil, between March 2012 and August 2013. The SWB was applied, by adding the WRP in the estimate of the effective actual evapotranspiration (ETrEF). The water efficiency indicators were calculated. The actual evapotranspiration on SWB (ETrSWB) overestimated ETrEF and, like other SWB components, it was affected by the factors irrigation depth, frequency and clone. The clone OEM is the most efficient, due to the use of the WRP, while MIU leads to highest gross economic returns for sale of cladodes as seed. As conclusion, the application of the soil water balance method in areas cultivated with cactus species must be accompanied by WRP.

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Influence of beech and spruce forests on soil water dynamics

10.5194/egusphere-egu2020-22353 ◽

2020 ◽

Author(s):

Vaclav Sipek ◽

Jan Hnilica ◽

Lukáš Vlček ◽

Soňa Hnilicová ◽

Miroslav Tesař

Keyword(s):

Water Balance ◽

Vertical Distribution ◽

Soil Water ◽

Soil Column ◽

Beech Forest ◽

Lower Pressure ◽

Water Dynamics ◽

Soil Water Balance ◽

Conifer Forest ◽

Soil Water Dynamics

This study focuses on the description of soil water dynamics at four sites with different land cover types, namely beech forest, conifer forest, meadow and clipped grass. The analysis was based on soil tensiometer measurements from five consecutive vegetation seasons (comprising both wet and dry years). We investigated both column average pressure heads and also their vertical distribution. The soil water balance was studied by the HYDRUS-1D model. The highest pressure heads were observed at the grassland site, followed by the meadow site. The forested sites were generally reaching lower pressure head values, which was a result of higher evapotranspiration and different soil properties. The differences between the spruce forest (Picea abies (L.)) and beech forest (Fagus sylvatica L.) were evident namely in dry periods, when the beech site was experiencing lower pressure heads. Contrarily, the spruce site was drier (with recorded lower pressure heads) in wet periods and at the beginning of each season. Compared to the conifer forest, lower pressure heads were observed in beech forest, namely at the bottom of the inspected soil column (down to 100 cm). The inspection of the soil water balance revealed different rates of evapotranspiration and drainage at all sites. The evapotranspiration was highest in the beech canopy followed by spruce and both grass covered sites. The differences between spruce and beech forest were based namely on the water consumption efficiency and differences in interception rates, vertical distribution of the roots, and soil hydraulic properties.&#160;This research was supported by the Czech Science Foundation (GA CR 20-00788S), SoilWater project (EIG CONCERT-Japan), and by the institutional support of the Czech Academy of Sciences, Czech Republic (RVO: 67985874).

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Soil water dynamics and evapotranspiration of forage cactus clones under rainfed conditions

Pesquisa Agropecuária Brasileira ◽

10.1590/s0100-204x2015000700001 ◽

2015 ◽

Vol 50 (7) ◽

pp. 515-525 ◽

Cited By ~ 10

Author(s):

Thieres George Freire da Silva ◽

Jorge Torres Araújo Primo ◽

Magna Soelma Beserra de Moura ◽

Sérvulo Mercier Siqueira e Silva ◽

José Edson Florentino de Morais ◽

...

Keyword(s):

Water Balance ◽

Soil Water ◽

Water Consumption ◽

Water Availability ◽

Crop Growth ◽

Water Dynamics ◽

Soil Water Balance ◽

Soil Water Availability ◽

Soil Water Dynamics ◽

Area Index

Abstract: The objective of this work was to evaluate soil water dynamics in areas cultivated with forage cactus clones and to determine how environmental conditions and crop growth affect evapotranspiration. The study was conducted in the municipality of Serra Talhada, in the state of Pernambuco, Brazil. Crop growth was monitored through changes in the cladode area index (CAI) and through the soil cover fraction, calculated at the end of the cycle. Real evapotranspiration (ET) of the three evaluated clones was obtained as the residual term in the soil water balance method. No difference was observed between soil water balance components, even though the evaluated clones were of different genus and had different CAI increments. Accumulated ET was of 1,173 mm during the 499 days of the experiment, resulting in daily average of 2.35 mm. The CAI increases the water consumption of the Orelha de Elefante Mexicana clone. In dry conditions, the water consumption of the Miúda clone responds more slowly to variation in soil water availability. The lower evolution of the CAI of the IPA Sertânia clone, during the rainy season, leads to a higher contribution of the evaporation component in ET. The atmospheric demand controls the ET of clones only when there is higher soil water availability; in this condition, the water consumption of the Miúda clone decreases more rapidly with the increase of atmospheric demand.

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Soil Water dynamic and water balance in a coral island: Zhaoshu Island, Xisha archipelago

10.22541/au.159586033.34465659 ◽

2020 ◽

Author(s):

Shengsheng Han ◽

Suxia Liu ◽

Xingguo Mo ◽

Lihu Yang ◽

XF Song

Keyword(s):

Water Balance ◽

Soil Water ◽

Xisha Archipelago ◽

Coral Island ◽

Soil Water Dynamic

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HYDRUS-1D Simulation of Soil Water Dynamics for Sweet Corn under Tropical Rainfed Condition

Applied Sciences ◽

10.3390/app10041219 ◽

2020 ◽

Vol 10 (4) ◽

pp. 1219 ◽

Cited By ~ 2

Author(s):

Mazhar Iqbal ◽

Md Rowshon Kamal ◽

Mohd Fazly M. ◽

Hasfalina Che Man ◽

Aimrun Wayayok

Keyword(s):

Water Balance ◽

Soil Water ◽

Surface Runoff ◽

Sweet Corn ◽

Water Dynamics ◽

Total Water ◽

Soil Water Dynamics ◽

Growing Seasons ◽

Rainfed Conditions ◽

Hydrus 1D

Assessment of soil water balance is essential to understand water dynamics for optimal use of water and fertilizers. The study intended to simulate soil water dynamics in sweet corn production under tropical rainfed conditions. Surface runoff, subsurface leaching, and evapotranspiration are the main components of water balance, especially in tropical environments. Therefore, intensive field experiments and HYDRUS-1D numerical modeling were applied to investigate the water balance components and analyzing water dynamics. The study was carried out in a sweet corn field for two growing seasons under the rainfed conditions at the Malaysian Agricultural Research and Development Institute (MARDI), Serdang, Malaysia. The total water inputs during the first and second seasons were 75.8 cm and 79.7 cm, respectively. Simulated results of evapotranspiration (ET) accounted for 40.7% and 33.1% of total water input during the first and second seasons. Surface runoff accounted for 41% and 28.6% in the first and second season, respectively. Water leaching accounted for 10.6%–26.8% of total water input during both seasons respectively. As rainfall fulfilled the crop water requirement throughout the growing seasons no additional irrigation was required. The overall simulation results validate the HYDRUS-1D as an effective tool to simulate soil water dynamics under rainfed conditions.

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