【摘要】：蒸散發(fā)的精確觀測及估算是水資源管理及水文遙感驗證的基礎(chǔ)。該文利用已有的渦動塔觀測數(shù)據(jù)集,配合波文比系統(tǒng)進行了同步觀測,對二者觀測的結(jié)果進行了對比分析。結(jié)果表明:渦動相關(guān)法和波文比方法估算的蒸散發(fā)均值及季節(jié)變動分別為298.73±128.58 W·m-2和272.37±116.87 W·m-2,整體而言這兩種方法所觀測的蒸散發(fā)較為一致,決定系數(shù)R2=0.75,平均相對誤差小于6%。較渦動相關(guān)法,波文比方法估算潛熱較低。生長季內(nèi),植被在生長初期及割草期出現(xiàn)明顯的差別,表明波文比系統(tǒng)在植被生長旺盛期測量潛熱效果更為穩(wěn)定。兩種方法估算的波文比具有相似的日變化及季節(jié)變動趨勢。波文比存在明顯的日變化及季節(jié)變動,其變動均值及標準差為0.21±0.42;其日變化與太陽輻射相關(guān)度較強(R2變動為0.41~0.52),其季節(jié)變化與葉面積指數(shù)(LAI)具有較高的非線性相關(guān)性(R2=0.65),而土壤水分對季節(jié)變動影響較小。該研究表明:在溫帶濕潤草地生態(tài)系統(tǒng),植被的生長很大程度上調(diào)節(jié)著該系統(tǒng)能量的分配。以上研究結(jié)果對波文比系統(tǒng)的實際應(yīng)用具有一定的參考價值。
[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 鹵128.58 W m -2 and 272.37 鹵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 鹵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.
【作者單位】： 北京師范大學地表過程與資源生態(tài)國家重點實驗室;北京師范大學地理科學學部資源學院;
【基金】：國家自然科學基金(41671019,41301014)資助
【分類號】：S812

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