| 摘要: |
| 本文以田间试验资料为基础,建立了一个农田水量平衡模型,模型中根系吸水项采用 DeJong 吸水函数,用农田潜在蒸散量乘以土壤水分胁迫系数计算农田实际蒸散量,降水或灌水后进入土壤每层的水量选用一个雨水分配模型。利用模型模拟的结果研究了冬小麦和夏玉米农田的水分变化规律,并计算了农田实际蒸散量和土壤分层根系吸水量。 |
| 关键词: 土壤水分平衡 模型 |
| DOI： |
| 分类号:S161.4 |
| 基金项目:国家教委留学回国人员科研资助项目 |
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| Comparison of the Reference Evapotranspiration Estimated by the Penman-Monteith and FAO-PPP-17 Penman Methods |
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Gong Yuanshi (Dept.of management of Soil Water,BAU,Beijing 100094)
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| Abstract: |
| Based on the field observing data,a soil layered water budget model was developed in this paper.The term for water uptake by roots in the model was used by DeJong-extraction function.Theac- tual evapotranspiration was calculated by potential evapotranspiration and a water stress factor.The water amount into the layered soil profile after a rain or an irrigation was estimated by an empirical model for rain water distribution.Using the simulated results,the properties of the field water cycle for winter wheat... |
| Key words: soil water budget model |
