干旱区生态环境知识资源中心(Arid): 毛乌素沙地油蒿灌丛Priestley-Taylor模型系数研究

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	毛乌素沙地油蒿灌丛Priestley-Taylor模型系数研究
其他题名	Priestley-Taylor model coefficient in a typical Artemisia ordosica shrubland in Mu Us Sandy Land of northwestern China
	梁椿烜; 马景永; 杨睿智; 吴雅娟; 田赟; 贾昕; 查天山; 杨林
来源期刊	北京林业大学学报
ISSN	1000-1522
出版年	2018
卷号	40 期号:12 页码:1-8
中文摘要	【目的】基于半经验半理论的Priestly-Taylor模型(PT)估算蒸散发(ET)时,主要依赖于精确确定该模型系数alpha在特定研究区内的适宜值,本研究就该模型系数alpha的适用性进行了本地化研究,以便更准确地估算干旱半干旱区的蒸散发。【方法】在中国西北干旱地区毛乌素沙地的一个生长季内,采用涡度协方差技术并结合气象数据信息,监测研究区典型油蒿灌丛地的水、热交换传输过程,以分析PT模型系数alpha的季节变化特征并确定其本地化估算参考值。【结果】在季节变化过程中,实际PT模型系数alpha整体变化较明显,展叶期内alpha系数呈单峰型变化趋势,完全展叶期和叶变色期内的alpha系数变化不明显;日均alpha系数最大值为0.66,最小值为0.03,全生长季alpha系数均值为0.23。油蒿生长季内alpha系数与冠层导度和饱和水汽压差呈对数正相关;土壤含水量(30 cm处)以及叶面积指数与alpha系数均为正相关关系。在季节变化过程中,PT模型常规系数alpha=1.26确定的蒸散量(ET_(1.26))估算值以及根据逐日温度和2 m高度处风速资料计算的PT模型系数alpha=0.50确定的蒸散量(ET_(0.50))估算值均显著大于实测蒸散发。改进的PT模型系数的本地化推荐适宜值为0.23,并且通过修正后的PT模型估算ET与实测值之间存在较好的一致性,线性斜率为0.72,R~2为0.57。【结论】因此,修正的PT模型显著提高干旱半干旱区植被蒸散发估算精度,为区域植被水文过程模型提供支持。
英文摘要	[Objective] Estimating evapotranspiration (ET) based on the semi-empirical and semi-theoretical Priestly-Taylor model (PT) mainly relies on accurately determining the appropriate value of the model coefficient alpha in a specific study area. This study expored the applicability of the model coefficient alpha. Localization studies have been conducted to more accurately estimate evapotranspiration in arid and semi-arid regions. [Method] This paper used the eddy covariance technique combined with micro-meteorological data to monitor the water and heat transfer processes of a typical Artemisia ordosica shrubland in growing season in Mu Us Sandy Land of northwestern China to quantify the seasonal variations in alpha coefficients. [Result] The results showed that the actual alpha coefficient had significant seasonal variations, peaking during the leafing period, and remaining relatively plateau during expanded leaf period and the leaf discoloration period. The maximum alpha coefficient was 0.66 and the minimum value was 0.03, averaging 0.23 in growing season. There was a logarithmic positive correlation between alpha coefficient and canopy conductance and saturated vapor pressure difference in the growing season. Soil water content (30 cm belowground) and leaf area index were positively correlated with alpha coefficient. Evapotranspiration estimated from the PT model with alpha=1.26 and with alpha=0.50, which was calculated from the wind speed data at 2 m height, was significantly larger than the measured evapotranspiration. The recommended localization value of the improved PT model coefficient alpha was 0.23, which gave better estimation of ET, linear gradient was 0.72, R~2 was 0.57. [Conclusion] Therefore, the modified PT model can be used to accurately estimate evapotranspiration in arid and semi-arid regions.
中文关键词	Priestley-Taylor模型系数 ; 蒸散发 ; 涡度相关法 ; 半干旱区 ; 油蒿
英文关键词	Priestley-Taylor model coefficient evapotranspiration eddy covariance semi-arid region Artemisia ordosica
类型	Article
语种	中文
国家	中国
收录类别	CSCD
WOS类目	Forestry
WOS研究方向	Forestry
CSCD记录号	CSCD:6394984
来源机构	北京林业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/237279
作者单位	梁椿烜, 北京林业大学水土保持学院, 北京 100083, 中国.; 马景永, 北京林业大学水土保持学院, 北京 100083, 中国.; 杨睿智, 北京林业大学水土保持学院, 北京 100083, 中国.; 吴雅娟, 北京林业大学水土保持学院, 北京 100083, 中国.; 田赟, 北京林业大学水土保持学院;;北京市水土保持工程技术研究中心;;水土保持国家林业局重点实验室, ;;北京市水土保持工程技术研究中心;;水土保持国家林业局重点实验室, ;;;;, 北京;;北京;;北京 100083;;100083;;100083, 中国.; 贾昕, 北京林业大学水土保持学院;;北京市水土保持工程技术研究中心;;水土保持国家林业局重点实验室, ;;北京市水土保持工程技术研究中心;;水土保持国家林业局重点实验室, ;;;;, 北京;;北京;;北京 100083;;100083;;100083, 中国.; 查天山, 北京林业大学水土保持学院;;北京市水土保持工程技术研究中心;;水土保持国家林业局重点实验室, ;;北京市水土保持工程技术研究中心;;水土保持国家林业局重点实验室, ;;;;, 北京;;北京;;北京 100083;;100083;;100083, 中国.; 杨林, 甘肃省定西市林木种苗管理站, 定西, 甘肃 743000, 中国.
推荐引用方式 GB/T 7714	梁椿烜,马景永,杨睿智,等. 毛乌素沙地油蒿灌丛Priestley-Taylor模型系数研究[J]. 北京林业大学,2018,40(12):1-8.
APA	梁椿烜.,马景永.,杨睿智.,吴雅娟.,田赟.,...&杨林.(2018).毛乌素沙地油蒿灌丛Priestley-Taylor模型系数研究.北京林业大学学报,40(12),1-8.
MLA	梁椿烜,et al."毛乌素沙地油蒿灌丛Priestley-Taylor模型系数研究".北京林业大学学报 40.12(2018):1-8.