| 淮河流域农田生态系统湍流输送特征 |
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| 引用本文： | 武强,杨书运,严平,韩云芳,李侠丽.淮河流域农田生态系统湍流输送特征[J].安徽农学通报,2015(3). |
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| 作者姓名： | 武强 杨书运 严平 韩云芳 李侠丽 |
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| 作者单位： | 安徽农业大学资源与环境学院,安徽合肥,230036 |
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| 摘 要： | 利用涡度相关法与垂直梯度法对安徽寿县农田湍流通量进行了连续观测，分析了不同天气状况与不同下垫面对农田湍流通量的影响。结果显示：农田湍流通量受不同天气条件的影响显著。LE、H、G变化特征在晴、阴、雨条件下均呈单峰型曲线，日峰值、变化幅度：LE＞H＞G；通量值受短时气象条件影响有所波动，其稳定程度：晴天＞阴天＞雨天；雪天湍流通量单峰曲线规律不明显，LE波动剧烈，G为负值。地表反照率：雪地＞裸地＞作物下垫面；雪面反照率最大，导致H、LE最小，G相对较大，为负值；作物下垫面地表反照率随作物生长周期有先增后减的趋势。反照率与湍流通量各值的变化呈负相关。
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| 关 键 词： | 农田 湍流通量 显热通量 土壤热通量 地表反照率 |
The Characteristics of the Turbulent Fluxes in the Huaihe River Farmland Ecosystem |
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| Abstract: | In this study,the eddy covariance and vertical gradient method was used for a continuous observa?tion on the farmland turbulent flux in Shouxian,Anhui province.The effects of different weather conditions and underlying surfaces on farmland turbulent fluxes was analyzed.The results show that the effects of the different weather conditions to farmland turbulent flux was significantly different.LE,H,G variation in sunny, cloudy,raining conditions showed a unimodal curve,meanwhile there may be fluctation affected by short-term weather conditions.Daily peak and Amplitude of variation shows:LE>H>G;The stability degree of flux value changing over time:sunny>cloudy>raining;In the snow,there is no obvious turbulent fluxes uni?modal regularity.LE is volatile extremely while G is the output state.The surface albedo:snowfield> bare field>crop land;Snow surface albedo was the largest,which result in H and LE was in minimum level,G is negative and higher by contrast.Crop land surface albedo has a tendency to increase after the decrease along with the crop growth cycle.Albedo change was negatively correlated with the turbulent flux value. |
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| Keywords: | Farmland Turbulent flux Sensible heat flux Soil heat flux Surface albedo |
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