JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (2): 127-134.doi: 10.12302/j.issn.1000-2006.201911006

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Evapotranspiration characteristics of middle-aged Eucalyptus urophylla×E. grandis plantation based on Penman-Monteith model in Nanning, Guangxi

REN Shiqi1,2(), ZHU Yuanli2,3, LIANG Yanfang2,3, CHEN Jianbo1,2, LU Cuixiang1,2, WU Qi1,2, WEI Zhendao1,2   

  1. 1. Guangxi Zhuang Autonomous Region Forestry Research Institute, Nanning 530002, China
    2. Guangxi Nanning Eucalypt Plantation Ecosystem Observation and Research Station, Nanning 530002, China
    3. Guangxi Zhuang Autonomous Region State-owned Qipo Forest Farm, Nanning 530225, China
  • Received:2019-11-04 Accepted:2020-02-16 Online:2021-03-30 Published:2021-04-09

Abstract:

【Objective】To apply the Penman-Monteith (PM) model to the analysis of the characteristics of evapotranspiration of Eucalyptus urophylla×E. grandis plantation in hilly area of Nanning, this paper aimed to provide a reference for compiled production and a management plan of an eucalyptus plantation. 【Method】We continuously observed the microclimate and hydrological data of E. urophylla × E. grandis plantation in the Nanning Eucalypt Ecosystem Station (NEES), and used the PM model to estimate the evapotranspiration of E. urophylla × E. grandis, and then compared the evapotranspiration estimated by the Water Balance Equation (WBE) with that of the PM model.【Result】The drought index in the month and year time scales indicated that E. urophylla × E. grandis plantation remained in a state of wet or semi-wet conditions. Average daily evapotranspiration was 3.5 mm/d and the highest daily evapotranspiration was 9.8 mm/d. The average monthly evapotranspiration was 96 mm, and the rank of evapotranspiration between seasons was summer > spring > autumn > winter. The average yearly evapotranspiration was 1 156 mm, which accounted for 82% of the precipitation. There was no significant difference between evapotranspiration which was estimated using the PM model and WBE.【Conclusion】There was a similar change rule of evapotranspiration between the PM model and WBE, and the monthly evapotranspiration was also not significantly different between them. We assert that the PM model could be used to accurately estimate the evapotranspiration of E. urophylla × E. grandis plantation. To further reduce the deviation of the evapotranspiration value, we should enhance the precision of the parameters of the PM model, such as the aerodynamic resistance and the water-balance components. In addition, the soil water relative content was in a partially wet state during the study period, and the soil water was not a limiting factor for evapotranspiration of E. urophylla × E. grandis plantation in the hilly area of Nanning.

Key words: Penman-Monteith (PM) model, Water Balance Equation (WBE), evapotranspiration, soil water, Eucalyptus urophylla×E. grandis

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