globalchange  > 气候变化事实与影响
DOI: 10.1007/s00271-018-0606-8
WOS记录号: WOS:000462199200002
论文题名:
One-step approach for estimating maize actual water use: Part I. Modeling a variable surface resistance
作者: Chavez, J. L.1; Lopez-Urrea, R.2,3
通讯作者: Chavez, J. L.
刊名: IRRIGATION SCIENCE
ISSN: 0342-7188
EISSN: 1432-1319
出版年: 2019
卷: 37, 期:2, 页码:123-137
语种: 英语
WOS关键词: STOMATAL-RESISTANCE ; AREA ; EMISSIVITY ; PERFORMANCE ; AIRCRAFT ; FLUXES ; INDEX ; NDVI
WOS学科分类: Agronomy ; Water Resources
WOS研究方向: Agriculture ; Water Resources
英文摘要:

In a global scenario of climate change, water scarcity and population growth, it is imperative to optimize crop water management. One way is by calibrating a physically based crop evapotranspiration (ET) model, in the so-called one-step approach; as opposed to the two-step approach that uses reference evapotranspiration and crop coefficients. The Penman-Monteith (Symposium of the society for experimental biology, the state and movement of water in living organisms, Academic Press, Inc., New York; Monteith, Symposium of the society for experimental biology, the state and movement of water in living organisms, Academic Press, Inc., New York, 1965) ET model uses a bulk surface resistance (r(s)) term. This variable describes the resistance (stomatal, leaf, and canopy) to crop water transpiration and water evaporation from the soil surface. If the crop is not transpiring at a potential rate the r(s) resistance depends on the water status of the soil and vegetation. The stomatal resistance is influenced by climate and by water availability. However, this influence is different from crop to crop. The resistance increases when the crop is stressed and when the soil water availability limits ET. In this study, surface resistance was parameterized for grain maize considering a number of plant and environmental variables for water stressed and non-stressed conditions. The independent explanatory variables that facilitated a good calibration of r(s), on a half-hourly basis, were: net radiation, photosynthetic active radiation, aerodynamic resistance, crop height, and leaf area index. The application of the obtained "r(s)" model (based on the variables mentioned above) resulted in maize ET (mm 30-min(-1)) estimation error of less than 1 +/- 10% when evaluated with eddy covariance based ET data. This result is evidence that it is possible to calculate maize ET with a small associated error at very small time scales, for water deprived and advective conditions, using the one-step ET approach.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/130503
Appears in Collections:气候变化事实与影响

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作者单位: 1.Colorado State Univ, Dept Civil & Environm Engn, 1372 Campus Delivery, Ft Collins, CO 80523 USA
2.ITAP, Parque Empresarial Campollano,2a Avda 61, Albacete 02007, Spain
3.FUNDESCAM, Parque Empresarial Campollano,2a Avda 61, Albacete 02007, Spain

Recommended Citation:
Chavez, J. L.,Lopez-Urrea, R.. One-step approach for estimating maize actual water use: Part I. Modeling a variable surface resistance[J]. IRRIGATION SCIENCE,2019-01-01,37(2):123-137
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