Comparison of Eddy Covariance and BREB methods in determining forest evapotranspiration——Case study on broad-leaved Korean pine forest in Changbai Mountain

Abstract

Abstract: In this paper,a comparative study was made to use the methods of Eddy Covariance and Bowen-Ratio Energy Balance(BREB) in continually measuring the evapotranspiration of broad-leaved Korean pine forest in Changbai Mountain from Sept.1 to Oct.31,2002.The results showed that in September,the evapotranspiration measured by Eddy Covariance and BREB was 83.1 and 87.9 mm,respectively,the error of BREB relative to Eddy Covariance was less than 6%,and the correlation between their daily total evapotranspiration was significant(0.78),suggesting that BREB was in good agreement with Eddy Covariance in forest evapotranspiration measurement.In October,the evapotranspiration measured by Eddy Covariance and BREB was 42.5 and 49.1 mm,respectively,the error of BREB relative to Eddy Covariance was up to 16%,and the correlation coefficient between their daily total evapotranspiration was 0.53,which suggested that the error of BREB method increased with decreasing vapour pressure gradient.In early and mid-September,evapotranspiration consumed 71% of total forest available energy,while most of the available energy was used for the transformation of sensible heat,and only 40% of total available energy was used by evapotranspiration after the forest was leafless.

Key words: Macrobrachium nipponense, Lead, Ultrastructure, Histochemistry

CLC Number:

WU Jiabing, GUAN Dexing, ZHANG Mi, HAN Shijie, JIN Changjie. Comparison of Eddy Covariance and BREB methods in determining forest evapotranspiration——Case study on broad-leaved Korean pine forest in Changbai Mountain[J]. cje, 2005, (10): 1245-1249.

References

[1] 马铃,赵平,饶兴权,等.2005.乔木蒸腾作用的主要测定方法[J].生态学杂志,24(1):88～96.
[2] 于贵瑞,张雷明,孙晓敏,等.2004.亚洲区域陆地生态系统碳通量观测研究进展[J].中国科学(D辑),34(增刊Ⅱ):15～29.
[3] 王正非,朱廷曜,朱劲伟.1985.森林气象学[M].北京:北京林业出版社,196～205.
[4] 王安志,裴铁璠.2001.森林蒸散测算方法研究进展与展望[J].应用生态学报,12(6):933～937.
[5] 朱劲伟.1980.波文比在研究森林蒸发散中的作用及其处理[J].林业科学,1:58～61.
[6] 刘和平,刘树华,朱廷曜,等.1997.森林冠层空气动力学参数的确定[J].北京大学学报(自然科学版),33(4):522～528.
[7] 宋从和.1993.波文比能量平衡法的应用及其误差分析[J].河北林学院学报,8(1):85～96.
[8] 吴家兵,关德新,孙晓敏,等.2004.长白山阔叶红松林CO2交换的涡动通量修订[J].中国科学(D辑),34(增刊Ⅱ):95～102.
[9] 周国逸.1988.森林生态系统蒸发散计算方法的研究[J].中南林学院学报,1:22～27.
[10] 贺庆棠.1980.森林的热量平衡[J].林业科学,1:24～33.
[11] 徐德应.1989.海南岛尖峰热带森林蒸散[J].林业科学研究,2(1):34～41.
[12] 程根伟,陈桂蓉.2003.贡嘎山暗针叶林区森林蒸散发特征与模拟[J].水科学进展,14(5):617～621.
[13] 魏天兴,朱金兆,张学培.1999.林分蒸散耗水量测定方法述评[J].北京林业大学学报,21(3):85～91.
[14] Angus DE, Watts PJ. 1984. Evapotranspiration-How good is the Bowen ration method[J]. Agric. Water. Man., 8:133 ～ 150.
[15] Fuchs M, Tanner CB. 1970. Error analysis of Bowen rations measured by differential psychrometry[J]. Agric. Meteorol., 7:329 ～ 334.
[16] Garratt JR. 1993. Sensitivity of climate simulations to land surface and atmospheric boundary-layer treatments-A review[J]. J.Clim. ,6:419～449.
[17] Grace J, Lloyd J, Mclntyre J. 1995. Fluxes of carbon dioxide and water vapour over an undisturbed tropical forest in southwest Amazonia[J]. Glob. Change Biol., 1:1 ～ 12.
[18] Greco S, Baldocchi DD. 1996. Seasonal variations of CO2 and water vapour exchange rates over a temperate deciduoud forest[J].Global. Change Biol., 2:183～ 197.
[19] Kell BW, Paul JH, Patrick JM, et al. 2001. A comparison of methods for determining forest evapotranspiration and its components: sap-flow, eddy covariance and catchment water balance[J]. Agric. For. Meteorol., 106:153～168.
[20] Luis SP, Alain P, Richard GA, et al. 1999. Evapotranspiration:Concepts and future trends[J]. J. Irrig. Drain. Engin., 125(2):45～51.
[21] Malek E, Bingham GE. 1993. Comparison of the Bowen ratio-energy balance and the water balance methods for the measurement of evapotranspiration[J]. J. Hydrol., 146: 209～ 220.
[22] Ohmura A. 1982. Objective criteria for rejecting data for Bowen ration flux calculations[J]. J. Appl. Meteorol., 21: 595 ～ 598.
[23] Paw U, Baldocchi KT, Meyers DD. 2000. Correction of eddy-covariance measurements incorporating both advective effects and density fluxes[J]. Boundary - Layer Meteorol., 97:487 ～ 511.
[24] Perez PJ, Castellvi F, Ibanez M, et al. 1999. Assessment of reliability of Bowen ration methods for partitioning fluxes[J]. Agric.For. Meteorol., 97:141 ～ 150.
[25] Prueger JH, Hatfield JL, Aase JK. 1997. Bowen-ratio comparisons with lysimetric evapotranspiration [J]. Agron. J., 89:730～736.
[26] Shuttleworth WJ, Gash JHC, Lloyd CR, et al. 1984. Eddy correlation measurements of energy partition for Amazon forest [J].Q. J. R. Meteorol. Soc., 110:1163～ 1169.