| 半干旱雨养农田典型晴天感热、潜热的阶段差异 |
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| 引用本文： | 王润元,杨兴国,把多辉,王胜.半干旱雨养农田典型晴天感热、潜热的阶段差异[J].甘肃气象,2004,22(4):26-28,39. |
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| 作者姓名： | 王润元 杨兴国 把多辉 王胜 |
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| 作者单位： | [1]中国气象局兰州干旱气象研究所，甘肃省干旱气候变化与减灾重点实验室，甘肃兰州730020 [2]天水市气象局，甘肃天水741018 |
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| 基金项目： | 国家自然科学基金项目(40205005)资助. |
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| 摘 要： | 利用野外试验观测资料，就西北地区东部半干旱雨养农田典型晴天感热、潜热在作物不同生长时段的变化特征进行初步的探讨。结果表明：在作物不同生长阶段，我国西北地区东部半干旱雨养农田典型晴天的感热、潜热日变化特点基本相似，均表现为单峰型变化特征。从春季到夏季。感热的阶段变化表现为增加的趋势，而潜热的阶段变化与晴天前期的降水变化基本一致，呈波动趋势。在农田的地气能量交换中，植被的影响为主导因素时，主要表现为潜热交换方式，太阳辐射的影响为主导因素时主要表现为感热交换方式。农田典型晴天波恩比的阶段变化与晴天前期降水量的阶段变化有较好的反对应关系。降水的季节变化基本决定了农田水分的季节变化。
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| 关 键 词： | 半干旱农田 感热 潜热 日变化 |
| 文章编号： | 1006-7639(2004)-04-0026-03 |
Changes of Sensible and Latent Heat on a Typical Clear Day on Dry - farming Land in Semi- arid Region during Different Development Phases of Crop |
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| WANG Run-yuan,YANG Xin-guo,BA Duo-hui,WANG Sheng.Changes of Sensible and Latent Heat on a Typical Clear Day on Dry - farming Land in Semi- arid Region during Different Development Phases of Crop[J].Gansu Meteorology,2004,22(4):26-28,39. |
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| Authors: | WANG Run-yuan YANG Xin-guo BA Duo-hui WANG Sheng |
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| Institution: | WANG Run-yuan~1,YANG Xin-guo~1,BA Duo-hui~2,WANG Sheng~1 |
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| Abstract: | Based on the field observation data, changes of sensible heat and latent heat on dry-farming land in semi-arid region during different development phases of crop on a typical clear day are presented in this paper. The results show that the daily variations of sensible heat and latent heat under typical clear day are similar in different growth period of crop and exhibit the single peak character. The sensible heat showed a tendency of increase from spring to summer, but the change of latent heat was similar to precipitation in different development phases of crop and showed a figure of a wave.When the influence of vegetation was a central factor, the latent heat is main way in land-atmosphere energy exchange. When the influence of solar radiation was the central factor, the sensible heat is the main way. The precipitation and HS/LE were going in opposition during different development phases of crop.The seasonal change of precipitation turned the seasonal change of water in dry-farming land. |
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| Keywords: | farmland in semi-arid area sensible heat latent heat daily variation |
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