Plantations of woody tree species play a cru-cial role in ecological security along coastal zones. Under-standing energy partitioning and evapotranspiration can reveal land-atmosphere interaction processes. We investi-gated energy fluxes, evapotranspiration, and their related biophysical factors using eddy covariance techniques in a black locust ( Robinia pseudoacacia L.) plantation in 2016, 2018, and 2019 on the Yellow River Delta. Downward long-wave radiation offsets 84-85％ of upward longwave radia-tion; upward shortwave radiation accounted for 12-13％ of downward shortwave radiation. The ratio of net radiation to downward radiation was 18-19％ over the three years. During the growing season, latent heat flux was the largest component of net radiation; during the dormant season, the sensible heat flux was the dominant component of net radia-tion. The seasonal variation in daily evapotranspiration was mainly controlled by net radiation, air temperature, vapor pressure deficit, and leaf area index. Black locust phenology influenced daily evapotranspiration variations, and evapo-transpiration was greater under sea winds than under land winds because soil water content at 10-cm depth was greater under sea winds during the day. Seasonal patterns of daily evaporative fraction, Bowen ratio, crop coefficient, Priest-ley-Taylor coefficient, surface conductance, and decoupling coefficient were mainly controlled by leaf area index. The threshold value of daily surface conductance was approxi-mately 8 mm s ?1 over the plantation.

Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration,Research Institute of Forestry,Chinese Academy of Forestry,Beijing 100091, People's Republic of China;Research Center for Coastal Forestry of National Forestry and Grassland Administration,Beijing 100091, People's Republic of China;Shandong Academy of Forestry Sciences,Ji'nan 250014, People's Republic of China;Forest Ecosystem Research Station of the Yellow River Delta in Shandong,Dongying 257000,People's Republic of China;Yellow River Delta Ecological Research Station of Coastal Wetland,Yantai Institute of Coastal Zone Research,Chinese Academy of Sciences,Yantai 264003, People's Republic of China;Key Laboratory of Dryland Agriculture of Ministry of Agriculture and Rural Affairs,Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences,Beijing 100081, People's Republic of China

[1]Xiang Gao;Zhenyu Du;Qingshan Yang;Jinsong Zhang;Yongtao Li;Xiaojie Wang;Fengxue Gu;Weiping Hao;Zekun Yang;Dexi Liu;Jianmin Chu-.Energy partitioning and evapotranspiration in a black locust plantation on the Yellow River Delta, China)[J].林业研究（英文版）,2022(04):1219-1232

Plantations,Downward

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