温带草地蒸散发及波文比观测与比较:涡动相关及波文比系统
发布时间：2019-02-11 10:50
【摘要】：蒸散发的精确观测及估算是水资源管理及水文遥感验证的基础。该文利用已有的涡动塔观测数据集,配合波文比系统进行了同步观测,对二者观测的结果进行了对比分析。结果表明:涡动相关法和波文比方法估算的蒸散发均值及季节变动分别为298.73±128.58 W·m-2和272.37±116.87 W·m-2,整体而言这两种方法所观测的蒸散发较为一致,决定系数R2=0.75,平均相对误差小于6%。较涡动相关法,波文比方法估算潜热较低。生长季内,植被在生长初期及割草期出现明显的差别,表明波文比系统在植被生长旺盛期测量潜热效果更为稳定。两种方法估算的波文比具有相似的日变化及季节变动趋势。波文比存在明显的日变化及季节变动,其变动均值及标准差为0.21±0.42;其日变化与太阳辐射相关度较强(R2变动为0.41~0.52),其季节变化与叶面积指数(LAI)具有较高的非线性相关性(R2=0.65),而土壤水分对季节变动影响较小。该研究表明:在温带湿润草地生态系统,植被的生长很大程度上调节着该系统能量的分配。以上研究结果对波文比系统的实际应用具有一定的参考价值。
[Abstract]:Accurate observation and estimation of evapotranspiration are the basis of water resources management and hydrological remote sensing verification. In this paper, using the existing vortex tower observation data set, the synchronous observation is carried out in conjunction with the Bowen ratio system, and the results of the two observations are compared and analyzed. The results show that the mean value and seasonal variation of evapotranspiration estimated by vortex correlation method and Bowen ratio method are 298.73 卤128.58 W m -2 and 272.37 卤116.87 W m -2, respectively. The coefficient of determination is 0.75, and the average relative error is less than 6. Compared with the vortex correlation method, the potential heat estimated by the Bowen ratio method is lower. During the growing season, there were obvious differences between the early growth period and the mowing stage of vegetation, which indicated that Boven was more stable than the system in measuring latent heat in the vigorous period of vegetation growth. The two methods have similar diurnal variation and seasonal variation trend. There are obvious diurnal and seasonal variations in Bowen ratio, its mean value and standard deviation are 0.21 卤0.42; The correlation between diurnal variation and solar radiation was stronger (R2 = 0.41 ~ 0.52), and the seasonal variation had a higher nonlinear correlation with leaf area index (LAI) (R _ 2N _ (0.65), but soil moisture had little effect on seasonal variation. The study shows that the growth of vegetation regulates the distribution of energy in temperate humid grassland ecosystem to a great extent. The above results have certain reference value for the practical application of Bowen ratio system.
【作者单位】： 北京师范大学地表过程与资源生态国家重点实验室;北京师范大学地理科学学部资源学院;
【基金】：国家自然科学基金(41671019,41301014)资助
【分类号】：S812
本文编号：2419658
[Abstract]:Accurate observation and estimation of evapotranspiration are the basis of water resources management and hydrological remote sensing verification. In this paper, using the existing vortex tower observation data set, the synchronous observation is carried out in conjunction with the Bowen ratio system, and the results of the two observations are compared and analyzed. The results show that the mean value and seasonal variation of evapotranspiration estimated by vortex correlation method and Bowen ratio method are 298.73 卤128.58 W m -2 and 272.37 卤116.87 W m -2, respectively. The coefficient of determination is 0.75, and the average relative error is less than 6. Compared with the vortex correlation method, the potential heat estimated by the Bowen ratio method is lower. During the growing season, there were obvious differences between the early growth period and the mowing stage of vegetation, which indicated that Boven was more stable than the system in measuring latent heat in the vigorous period of vegetation growth. The two methods have similar diurnal variation and seasonal variation trend. There are obvious diurnal and seasonal variations in Bowen ratio, its mean value and standard deviation are 0.21 卤0.42; The correlation between diurnal variation and solar radiation was stronger (R2 = 0.41 ~ 0.52), and the seasonal variation had a higher nonlinear correlation with leaf area index (LAI) (R _ 2N _ (0.65), but soil moisture had little effect on seasonal variation. The study shows that the growth of vegetation regulates the distribution of energy in temperate humid grassland ecosystem to a great extent. The above results have certain reference value for the practical application of Bowen ratio system.
【作者单位】： 北京师范大学地表过程与资源生态国家重点实验室;北京师范大学地理科学学部资源学院;
【基金】：国家自然科学基金(41671019,41301014)资助
【分类号】：S812
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