scholarly journals Influence of Soil Physical Properties and Terrain Relief on Actual Evapotranspiration in the Catchment with Prevailing Arable Land Determined by Energy Balance and Bowen Ratio

10.5772/52810 ◽  
2013 ◽  
Author(s):  
Renata Duffkov
Keyword(s):  
Energy Balance ◽  
Physical Properties ◽  
Arable Land ◽  
Bowen Ratio ◽  
Soil Physical Properties ◽  
Actual Evapotranspiration

scholarly journals Soil Physical Properties of Arable Land by Land Use Across the Country

2012 ◽  
Vol 45 (3) ◽  
pp. 344-352 ◽  
Author(s):  
H.R. Cho ◽  
Y.S. Zhang ◽  
K.H. Han ◽  
H.J. Cho ◽  
J.H. Ryu ◽  
...  
Keyword(s):  
Land Use ◽  
Physical Properties ◽  
Arable Land ◽  
Soil Physical Properties

scholarly journals Variation of soil organic carbon and physical properties in relation to land uses in the Yellow River Delta, China

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Shuying Jiao ◽  
Junran Li ◽  
Yongqiang Li ◽  
Ziyun Xu ◽  
Baishu Kong ◽  
...  
Keyword(s):  
Land Use ◽  
Physical Properties ◽  
Soil Quality ◽  
Yellow River ◽  
Arable Land ◽  
Yellow River Delta ◽  
Soil Physical Properties ◽  
Land Uses ◽  
Forest Land ◽  
The Yellow River Delta

AbstractSoil physical properties and soil organic carbon (SOC) are considered as important factors of soil quality. Arable land, grassland, and forest land coexist in the saline-alkali reclamation area of the Yellow River Delta (YRD), China. Such different land uses strongly influence the services of ecosystem to induce soil degradation and carbon loss. The objective of this study is to evaluate the variation of soil texture, aggregates stability, and soil carbon affected by land uses. For each land use unit, we collected soil samples from five replicated plots from “S” shape soil profiles to the depth of 50 cm (0–5, 5–10, 10–20, 20–30, and 30–50 cm). The results showed that the grassland had the lowest overall sand content of 39.98–59.34% in the top 50 cm soil profile. The content of soil aggregates > 0.25 mm (R0.25), mean weight diameter and geometric mean diameter were significantly higher in grassland than those of the arable and forest land. R0.25, aggregate stability in arable land in the top 30 cm were higher than that of forest land, but lower in the soil profile below 20 cm, likely due to different root distribution and agricultural practices. The carbon management index (CMI) was considered as the most effective indicator of soil quality. The overall SOC content and CMI in arable land were almost the lowest among three land use types. In combination with SOC, CMI and soil physical properties, we argued that alfalfa grassland had the advantage to promote soil quality compared with arable land and forest land. This result shed light on the variations of soil properties influenced by land uses and the importance to conduct proper land use for the long-term sustainability of the saline-alkali reclamation region.

scholarly journals Actual evapotranspiration from partially tile-drained fields as influenced by soil properties, terrain and crop

2011 ◽  
Vol 6 (No. 3) ◽  
pp. 131-146 ◽  
Author(s):  
R. Duffková ◽  
A. Zajíček ◽  
E. Nováková
Keyword(s):  
Physical Properties ◽  
Soil Properties ◽  
Soil Water ◽  
Water Regime ◽  
Bowen Ratio ◽  
Crop Productivity ◽  
Actual Evapotranspiration ◽  
Discharge Zone ◽  
Soil Drought ◽  
Permanent Grassland

  Physical properties of soils have a significant influence on their water regime and should be considered when selecting suitable agricultural crops for particular sites, taking into account the crop productivity and its water requirements. Mean daily rates of actual evapotranspiration (ETa) were obtained by collation of measured or otherwise estimated 10-min values for the years 2004, 2006 and 2009 for a partially tile-drained agricultural experimental catchment in the Bohemo-Moravian Highland (Czech Republic). ETa was measured using the Bowen ratio (β) and energy balance (BREB) method at four weather stations located on different soil types (Stagnosols, Cambisols) and terrain relief positions (defined with respect to the groundwater recharge and discharge zones) over different crops (cereals, oil rape and permanent grassland). A systematic influence of soil properties on the evapotranspiration rate was more pronounced during the periods of limited transpiration (soil drought, crop maturity), when the average daily ETa was significantly lower and the corresponding β significantly higher over coarser-textured soils (shallow Haplic Cambisols), namely (year–ETa (mm/day)/β): 2004 – 1.75/1.66; 2006 – 2.44/0.93; 2009 – 2.60/0.81), than over finer-textured soils (Stagnic Cambisols and Haplic Stagnosols), namely: 2004 – 2.92/0.97; 2006 – 3.06/0.44; 2009 – 3.42/0.39). When the transpiration was not limited by soil water deficit, it acted as an equalizing factor smoothing down evapotranspiration from heterogeneous soil areas, whereby the effect of the soil physical properties was masked. With regard to soil water regime and evapotranspiration, the tile-drained Stagnic Cambisol lands behaved similarly as non-drained Haplic Cambisols. The effects of land use and of the terrain relief position could not be tracked independently, because the permanent grassland was situated in the wetter and texturally heavier parts of the catchment and the positions of the recharge/discharge zone coincided with the positions of texturally lighter/heavier soils, respectively.

scholarly journals Assessment of daily actual evapotranspiration with SEBAL and S-SEBI algorithms in cotton crop

2010 ◽  
Vol 25 (3) ◽  
pp. 383-392 ◽  
Author(s):  
Carlos Antonio Costa dos Santos ◽  
Bergson Guedes Bezerra ◽  
Bernardo Barbosa da Silva ◽  
Tantravahi Venkata Ramana Rao
Keyword(s):  
Remote Sensing ◽  
Energy Balance ◽  
Iterative Process ◽  
Arid Regions ◽  
Bowen Ratio ◽  
The State ◽  
Actual Evapotranspiration ◽  
Cotton Crop ◽  
Semi Arid

The main objective of this study is to assess the daily ET accuracy obtained by remote sensing algorithms in comparison with measurements in situ. The experiment was conducted in the State of Ceará, Brazil, in a cotton experimental field of EMBRAPA using Bowen ratio measurements to obtain the energy balance components. SEBAL and S-SEBI algorithms were used with four TM Landsat - 5 images of 2005, in order to determine the actual evapotranspiration of cotton crop. The comparison between the estimated values by remote sensing algorithms and the measured values in situ showed that the methods (SEBAL and S-SEBI) presented satisfactory results. The S-SEBI algorithm is an important tool to be applied in ET analysis of semi-arid regions, due its practicability to solve the energy balance and its processing is simpler than SEBAL algorithm which needs the solution of an iterative process.

scholarly journals Actual Evapotranspiration in Suli Alpine Meadow in Northeastern Edge of Qinghai-Tibet Plateau, China

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Jin-kui Wu ◽  
Shi-qiang Zhang ◽  
Hao Wu ◽  
Shi-wei Liu ◽  
Yu Qin ◽  
...  
Keyword(s):  
Energy Balance ◽  
Alpine Meadow ◽  
Bowen Ratio ◽  
Growing Season ◽  
High Elevation ◽  
Actual Evapotranspiration ◽  
Tibet Plateau ◽  
Evapotranspiration Estimation ◽  
Qinghai Tibet Plateau ◽  
Ratio Energy

Actual evapotranspiration was observed by using eddy covariance (EC) technique, calculated by micrometeorological method the Bowen ratio energy balance (BREB) and measured by micro-lysimeter (ML) in the Suli alpine meadow which located in the northeastern edge of Qinghai-Tibet Plateau noted for its high elevation and cold environment during the growing season in 2011. Results showed that the energy balance ratio for half-hour data was 0.74. Without consideration of uncertainty, the evapotranspiration values estimated by BREB, ML, and EC were 270.6 mm, 238.9 mm, and 236.1 mm, respectively. Significant correlation existed between the evapotranspiration results by the three methods. Uncertainties of the evapotranspiration estimation by BREB, ML, and EC were 19.6 mm, 15.6 mm, and 15.1 mm, respectively. Deduced by facts on the natural and vegetation conditions, the value of evapotranspiration should be equal to that of precipitation, that is, about 252 mm. From this point, the evapotranspiration values estimated by the three methods were within a reliable range. The EC method has larger advantage and wider scope for the estimation of evapotranspiration in alpine meadow area.

­Actual Evapotranspiration for Sugarcane Based on Bowen Ratio-Energy Balance and Soil Water Balance Models with Optimized Crop Coefficients.

2021 ◽  
Author(s):  
Suelen da Costa Faria Martins ◽  
Marcos Alex dos Santos ◽  
Gustavo Bastos Lyra ◽  
José Leonaldo Souza ◽  
Guilherme Bastos Lyra ◽  
...  
Keyword(s):  
Energy Balance ◽  
Water Balance ◽  
Soil Water ◽  
Bowen Ratio ◽  
Balance Method ◽  
Northeastern Brazil ◽  
Soil Water Balance ◽  
Actual Evapotranspiration ◽  
Crop Coefficients ◽  
Ratio Energy

Abstract Evapotranspiration is an important parameter to evaluate soil water deficit and water use efficiency, especially at places with irregularly distributed precipitation.The aim of this study was to assess the daily actual evapotranspiration (ETa) estimated by the Thornthwaite and Mather soil water balance method adapted for crops (ThM) and by the dual Kc approach with the crop coefficients optimized from inversing modeling and by the adjustment procedure suggested in FAO-56. The models comparison and optimization were performed with actual evapotranspiration determined by the Bowen ratio – energy balance method (ETβ) for sugarcane at full canopy closure grown in Alagoas State, Northeastern Brazil. The objective function of the inverse problem was defined in terms of ETβ and ETa estimated by the ThM and dual Kc method by optimizing single crop coefficient (Kc) and the basal coefficient Kcb, respectively. Both optimized Kcand Kcbwere lower than the adjusted KcFAO56, with optimized Kconly 3% less than the Kc obtained experimentally. ETa estimated by ThM and dual Kc models with optimized crop coefficients (Kc = 1.05 or Kcb = 1.00) had similar high precision (r² >0.79) and accuracy (dm>0.93 and RMSE < 0.30 mm d-1), whereas using the coefficients derived from FAO 56 overestimated ETa in both models.

Soil physical properties of afforested and arable land

1997 ◽  
Vol 13 (4) ◽  
pp. 209-217 ◽  
Author(s):  
I. Messing ◽  
A. Alriksson ◽  
W. Johansson
Keyword(s):  
Physical Properties ◽  
Arable Land ◽  
Soil Physical Properties

Comparison of actual evapotranspiration based on lysimeter, scintillometer and bowen ratio energy balance method

2020 ◽  
Author(s):  
Veronika Forstner ◽  
Matevž Vremec ◽  
Matěj Orság ◽  
Gabriela Pozníková ◽  
Steffen Birk ◽  
...  
Keyword(s):  
Energy Balance ◽  
Land Surface ◽  
Near Infrared ◽  
Agricultural Research ◽  
Sensible Heat Flux ◽  
Bowen Ratio ◽  
Vegetation Period ◽  
The Other ◽  
Actual Evapotranspiration ◽  
Ratio Energy

&lt;p&gt;Evapotranspiration is an important parameter for grassland ecosystems because the (actual) evapotranspiration explains the exchange of water and energy between soil, land surface and atmosphere. Understanding the effects of changing grassland yields on evapotranspiration rates is essential for the assessment of the water- and plant water balance of grassland sites under climate change. However, evapotranspiration is difficult to measure, and the suitability of the various methods strongly depends on the time and spatial scale considered. Thus, the aim of this work is to compare different measurements of actual evapotranspiration (ETa) at a managed alpine grassland site. The study area is located in the northern alps of Austria, at the Agricultural Research and Education Centre Raumberg-Gumpenstein (Styria). Here, the ETa data of a high resolution weighable lysimeters, are compared with ETa data measured by a scintillometer system BLS900 (Scintec, Germany). The system measures sensible heat flux integrated along the near-infrared beam of 880 nm, length of 356 m and height of 6.3 m above grassy surface. The ETa is calculated as a residual from the energy balance equation. Another independent source of ETa data is the Bowen ratio energy balance system (BREB), which is placed roughly in the middle of the scintillometer path and adjacently (few meters) to the lysimeter.&lt;/p&gt;&lt;p&gt;During the observation period (vegetation period 2018; March-November), ETa calculated from the weighable lysimeter was 573 mm in total and showed the highest absolute value compared to the other measurements. The calculated ETa from the BREB system is 505 mm (including condensation) and 526 mm (excluding condensation).&lt;/p&gt;&lt;p&gt;At the beginning of the vegetation growth, the scintillometer system measured lower values of ETa than the lysimeter, but higher values than the BREB system. Contrary, at the end of May, the lysimeter ETa showed the lowest values compared to the other two systems. This can be related to the fact that the grass on the lysimeter was cut three times per year, whereas the management of other areas on the experimental site was different. The same effects were observed at the second and third cut, always with the fact that the scintillometer system showed higher values than the BREB system. After two weeks of the first and second cut, the vegetation on the lysimeters was established faster than on the surrounding grassland. As a consequence, the lysimeter ETa showed again the highest values. Only after the third cut at the end of September, the vegetation was slowly growing and the scintillometer as well the BREB system showed higher ETa values till the end of the observation month in November. These results suggest that the evapotranspiration rates are strongly dependent on the management of the grassland, which needs to be considered in the selection and design of evapotranspiration measurements.&lt;/p&gt;

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