A Measurement Based Sensitivity Analysis of the Penman-Monteith Actual Evapotranspiration Model for Crops of Different Height and in Contrasting Water Status
A Measurement Based Sensitivity Analysis of the Penman-Monteith Actual Evapotranspiration Model for Crops of Different Height and in Contrasting Water Status
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DOI：
10.1007/s007040050039
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发表时间：
1998-09
影响因子：
3.4
通讯作者：
G. Rana;N. Katerji
中科院分区：
文献类型：
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作者：
G. Rana;N. Katerji
本文研究了Penman-Monteith蒸散模型在半干旱气候条件下，对不同高度和不同水分状况（充分灌溉和水分胁迫）下作物的气候（有效能量和水汽压亏缺）和参数（空气动力学和冠层阻力）因子的敏感性。在意大利南部对参考草（0.1 m）、粒用高粱（0.1 m）和甜高粱（0.3 m）进行了三个实验。对于这种分析，敏感性系数，采取每小时的平均值，在作物完全覆盖土壤的生长季节进行评估。蒸散的相对误差也进行了评估。结果表明，对于参比草，有效能和空气动力学阻力起主要作用。对于水分胁迫下的作物，最重要的评价指标是冠层阻力。对于高大作物，如甜高粱，当作物处于良好的水分状况和水分胁迫下时，蒸汽压不足的作用是根本性的。
This paper presents a study of the sensibility of the Penman-Monteith evapotranspiration model to climatic (available energy and vapour pressure deficit) and parametric (aerodynamic and canopy resistances,raandrcrespectively) factors in a semi-arid climate, for crops in contrasting water status (well irrigated and under water stress) and of different heights. Three experiments were carried out in southern Italy on reference grass (≈ 0.1 m), grain sorghum (≈ 1 m) and sweet sorghum (≈ 3 m). For this analysis the sensitivity coefficients, taken as hourly means, were evaluated during the growth season when the crops completely covered the soil. The relative errors on evapotranspiration were also evaluated forraandrc. The results showed that, for reference grass, available energy and aerodynamic resistance play a major role. For crops under water stress the most important term to evaluate is canopy resistance. For a tall crop, as sweet sorghum, the role of the vapour pressure deficit is fundamental, both when the crop is in good water status and under water stress.