Actual Evapotranspiration of Unirrigated Grass in a Smart Field Lysimeter
We selected 585 rainless days with regular records for the analysis of daily differences. On most days, the lysimeter‐measured actual evapotranspiration, ETa, was smaller than the Penman–Monteith FAO 56 reference crop evapotranspiration, ET0. The FAO 56 procedure was found to be a reasonable estimat...
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2020
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oai:localhost:DHTL-96462020-10-29T07:56:16Z Actual Evapotranspiration of Unirrigated Grass in a Smart Field Lysimeter Doležal, F. Hernandez-Gomis, R. Matula, S. Gulamov, M. Miháliková, M. Khodjaev, S. American Society of Civil Engineers Evapotranspiration Percolate collecting bottle mass Smart field lysimeter Lysimeter weight We selected 585 rainless days with regular records for the analysis of daily differences. On most days, the lysimeter‐measured actual evapotranspiration, ETa, was smaller than the Penman–Monteith FAO 56 reference crop evapotranspiration, ET0. The FAO 56 procedure was found to be a reasonable estimator of the unstressed evapotranspiration in a moderately stressed environment. The ETa/ET0 ratio and the canopy surface resistance, rs, depend on the soil water content and suction measured at 5 cm. These graphs break down into horizontal unstressed parts and declining (for ETa/ET0) or inclining (for rs) water‐stressed parts. The ratio ETa/ET0 is about 85% and rs is about 250 s m−1 when the grass is not under water stress. The annual curve of the unstressed crop coefficient has a sine shape. An energy balance criterion suggests that advection of heat is important in winter but not so much in summer. The study provides parameters of evapotranspiration for a canopy that can be found on many standard weather stations and demonstrates that high‐quality research into evapotranspiration of low, dense, and shallow‐rooting crops is possible with small lysimeters of this type. https://acsess.onlinelibrary.wiley.com/doi/10.2136/vzj2017.09.0173 2020-10-29T07:56:16Z 2020-10-29T07:56:16Z 2018 BB 1539-1663 http://tailieuso.tlu.edu.vn/handle/DHTL/9646 en Vadose Zone Journal, Volume 17, Issue 1 (2018), pp.1-13 |
| institution |
Trường Đại học Thủy Lợi |
| collection |
DSpace |
| language |
English |
| topic |
American Society of Civil Engineers Evapotranspiration Percolate collecting bottle mass Smart field lysimeter Lysimeter weight |
| spellingShingle |
American Society of Civil Engineers Evapotranspiration Percolate collecting bottle mass Smart field lysimeter Lysimeter weight Doležal, F. Actual Evapotranspiration of Unirrigated Grass in a Smart Field Lysimeter |
| description |
We selected 585 rainless days with regular records for the analysis of daily differences. On most days, the lysimeter‐measured actual evapotranspiration, ETa, was smaller than the Penman–Monteith FAO 56 reference crop evapotranspiration, ET0. The FAO 56 procedure was found to be a reasonable estimator of the unstressed evapotranspiration in a moderately stressed environment. The ETa/ET0 ratio and the canopy surface resistance, rs, depend on the soil water content and suction measured at 5 cm. These graphs break down into horizontal unstressed parts and declining (for ETa/ET0) or inclining (for rs) water‐stressed parts. The ratio ETa/ET0 is about 85% and rs is about 250 s m−1 when the grass is not under water stress. The annual curve of the unstressed crop coefficient has a sine shape. An energy balance criterion suggests that advection of heat is important in winter but not so much in summer. The study provides parameters of evapotranspiration for a canopy that can be found on many standard weather stations and demonstrates that high‐quality research into evapotranspiration of low, dense, and shallow‐rooting crops is possible with small lysimeters of this type. |
| author2 |
Hernandez-Gomis, R. |
| author_facet |
Hernandez-Gomis, R. Doležal, F. |
| format |
BB |
| author |
Doležal, F. |
| author_sort |
Doležal, F. |
| title |
Actual Evapotranspiration of Unirrigated Grass in a Smart Field Lysimeter |
| title_short |
Actual Evapotranspiration of Unirrigated Grass in a Smart Field Lysimeter |
| title_full |
Actual Evapotranspiration of Unirrigated Grass in a Smart Field Lysimeter |
| title_fullStr |
Actual Evapotranspiration of Unirrigated Grass in a Smart Field Lysimeter |
| title_full_unstemmed |
Actual Evapotranspiration of Unirrigated Grass in a Smart Field Lysimeter |
| title_sort |
actual evapotranspiration of unirrigated grass in a smart field lysimeter |
| publishDate |
2020 |
| url |
http://tailieuso.tlu.edu.vn/handle/DHTL/9646 |
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AT dolezalf actualevapotranspirationofunirrigatedgrassinasmartfieldlysimeter |
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