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首页> 外文期刊>Acta Horticulturae >The dual crop coefficient approach: testing the SIMDualKc model with peach orchard evapotranspiration Eddy covariance measurements.
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The dual crop coefficient approach: testing the SIMDualKc model with peach orchard evapotranspiration Eddy covariance measurements.

机译：双重作物系数方法：使用桃园蒸发蒸腾涡流协方差测量测试SIMDualKc模型。

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摘要

The SIMDualKc model is a water balance simulation model that allows estimating crop evapotranspiration using the dual crop coefficient approach. This approach separately considers plant transpiration and soil evaporation through the basal crop coefficient and the evaporation coefficient, respectively. The use of dual crop coefficients has proved to be more adequate than single crop coefficients for discontinuous crops, with incomplete cover of the soil, and for high frequency irrigation. The model was tested with peach orchard evapotranspiration (ET) measurements obtained by the eddy covariance technique (EC). The measurements were performed in central Portugal under Mediterranean conditions, in a sandy soil, during two irrigation seasons. Direct measurements of ET were thereafter correlated with continuous sap flow (SF) measurements (providing tree transpiration) and soil evaporation estimates (obtained from a locally calibrated model). These combination of techniques provided ET for the entire irrigation season. The orchard had a low fraction of ground covered by vegetation which was taken into account in SIMDualKc by adopting a density factor for the calculation of the basal crop coefficient. Results showed a difference of up to 0.1 mm between mean daily measured (2.1 mm) and simulated (2.2 mm) ET. Thus the model slightly overestimated ET when comparing to ET obtained by way of a EC-SF relationship. The experimentally determined single crop coefficient (Kc) was around 0.5, the same as the modelled Kc. Soil evaporation estimates by the SIMDualKc model were closer to experimental data than transpiration estimates. The accuracy of the model is acceptably good considering the applications intended.
机译：SIMDualKc模型是一种水平衡模拟模型，可以使用双重作物系数方法估算作物的蒸散量。该方法分别通过基础作物系数和蒸发系数来考虑植物的蒸腾作用和土壤蒸发。对于土壤不完全覆盖的不连续作物和高频灌溉，双重作物系数的使用已被证明比单一作物系数的使用更为合适。通过涡流协方差技术（EC）获得的桃园蒸发蒸腾（ ET ）测量值对模型进行了测试。在两个灌溉季节期间，在地中海条件下的葡萄牙中部，沙质土壤中进行了测量。然后，将 ET 的直接测量值与连续的树液流量（SF）测量值（提供树木蒸腾作用）和土壤蒸发估算值（从本地校准模型中获得）相关联。这些技术的结合为整个灌溉季节提供了ET。果园的植被覆盖率很低，在SIMDualKc中通过采用密度因子来计算基础作物系数而将其考虑在内。结果表明，每日平均测量值（2.1 mm）与模拟（2.2 mm）的ET差异最大为0.1 mm。因此，与通过EC-SF关系获得的 ET 进行比较时，该模型略微高估了 ET 。实验确定的单一作物系数（ Kc ）约为0.5，与建模的 Kc 相同。 SIMDualKc模型估算的土壤蒸发量比蒸腾估算值更接近实验数据。考虑到预期的应用，模型的准确性可以接受。

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