A carregar...
Publicação
Transpiration and Water Use of an Irrigated Traditional Olive Grove with Sap-Flow Observations and the FAO56 Dual Crop Coefficient Approach
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 1.17 MB | Adobe PDF |
Orientador(es)
Resumo(s)
The SIMDualKc model was applied to evaluate the crop water use and the crop coefficient
(Kc) of an irrigated olive grove (Olea europaea L.) located in Sicily, Italy, using experimental data
collected from two crop seasons. The model applies the FAO56 dual Kc approach to compute the
actual crop evapotranspiration (ETc act) and its components, i.e., the actual tree transpiration (Tc act),
obtained through the basal crop coefficient (Kcb), and soil evaporation according to an evaporation coefficient
(Ke). Model calibration was performed by minimizing the difference between the predicted
Tc act and the observed daily tree transpiration measured with sap flow instrumentation (TSF field)
acquired in 2009. The validation was performed using the independent data set of sap flow measurements
from 2011. The calibrated Kcb was equal to 0.30 for the initial and non-growing season stages,
0.42 for the mid-season, and 0.37 for the end season. For both seasons, the goodness-of-fit indicators
relative to comparing TSF field with the simulated Tc act resulted in root mean square errors (RMSE)
lower than 0.27 mm d1 and a slope of the linear regression close to 1.0 (0.94 b0 1.00). The olive
grove water balance simulated with SIMDualKc produced a ratio between soil evaporation (Es) and
ETc act that averaged 39%. The ratio between actual (ETc act) and potential crop evapotranspiration
(ETc) varied from 84% to about 99% in the mid-season, indicating that the values of ETc act are close
to ETc, i.e., the adopted deficit irrigation led to limited water stress. The results confirm the suitability
of the SIMDualKc model to apply the FAO56 dual Kc approach to tree crops, thus assessing the water
use of olives and supporting the development of appropriate irrigation management tools that are usable
by farmers. A different way to estimate Kcb is based on the approach suggested in 2009 by Allen
and Pereira (A&P), which involves the measured fraction of ground covered (shaded) by the crop
and the height of the trees. Its application to the studied grove produced the mid-season Kcb values
ranging from 0.40–0.45 and end-season Kcb values ranging from 0.35–0.40. The comparison between
the A&P-computed Tc act A&P and TSF field shows RMSE values ranging from 0.27 to 0.43 mm d1,
which demonstrates the adequacy of the latter approach for parameterizing water balance models
and for irrigation scheduling decision making
Descrição
Palavras-chave
standard basal crop coefficient actual transpiration soil evaporation sap flow orchard water balance fraction of ground cover Kcb from cover fraction and height
Contexto Educativo
Citação
Puig-Sirera, À.; Rallo, G.; Paredes, P.; A. Paço, T.; Minacapilli, M.; Provenzano, G.; S. Pereira, L. Transpiration andWater Use of an Irrigated Traditional Olive Grove with Sap-Flow Observations and the FAO56 Dual Crop Coefficient Approach. Water 2021, 13, 2466
Editora
MDPI