文献类型：期刊文献

英文题名：Environmental controls of evapotranspiration in a mixed plantation in North China

作者：Tong, Xiaojuan[1] Zhang, Jinsong[2] Meng, Ping[2] Li, Jun[3] Zheng, Ning[2]

第一作者：Tong, Xiaojuan

通信作者：Tong, XJ[1]

机构：[1]Beijing Forestry Univ, Coll Forestry, Beijing 100083, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry, Key Lab Tree Breeding & Cultivat, State Forestry Adm, Beijing 100091, Peoples R China;[3]Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China

年份：2017

卷号：61

期号：2

起止页码：227-238

外文期刊名：INTERNATIONAL JOURNAL OF BIOMETEOROLOGY

收录：;Scopus(收录号：2-s2.0-84976878444);WOS:【SCI-EXPANDED(收录号:WOS:000393669800003)】；

基金：This study was sponsored by the National Natural Science Foundation of China (31570617, 31100322), the Special Public Sector Research (GYHY20110400904), and the Fundamental Research Funds for the Central Universities (No. YX2011-19). We are grateful to Mr. Changrong Jia and Mr. Yingfeng Ren for their assistance with field measurements.

语种：英文

外文关键词：Evapotranspiration; Mixed plantation; Eddy covariance; Priestley-Taylor coefficient; Decoupling factor; Canopy conductance

摘要：The mixed plantation plays an important role in the water cycle in the hilly area of North China. To evaluate the effect of afforestation on the water balance in this region, the temporal variation of evapotranspiration (ET) and environmental controls were investigated based on the eddy flux measurement of water vapor in a 31-year-old mixed plantation from 2006 to 2010. During 5 years, annual ET ranged from 513 to 680 mm, with an average of 579 mm. Growing season ET accounted for 72-82 % of annual ET during the 5-year period and its interannual variation was determined by the number of rainy days. In the non-growing and growing seasons, monthly ET was primarily dependent on monthly mean soil water content and monthly mean net radiation, respectively. Annual mean Priestley-Taylor coefficient (alpha) was 0.64, and the decoupling factor (Omega) was 0.48. High values of alpha and Omega implied that ET was energy limited in the growing seasons of 2006-2010. The mean annual ratio of ET to precipitation (ET/P) was 1.10. The density of the mixed plantation was around 50 % higher than the optimal value determined by local water capacity, leading to a large ET/P ratio. The dense plantation needs to be thinned to prevent excessive water loss in the hilly area of North China.