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Journal of Geographical Sciences

, Volume 29, Issue 11, pp 1807–1822 | Cite as

Estimation and analysis of the ratio of transpiration to evapotranspiration in forest ecosystems along the North-South Transect of East China

  • Xiaoli RenEmail author
  • Qianqian Lu
  • Honglin He
  • Li Zhang
  • Zhongen Niu
Article
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Abstract

The ratio of transpiration to evapotranspiration (T/ET) is a key parameter for quantifying water use efficiency of ecosystems and understanding the interaction between ecosystem carbon uptake and water cycling in the context of global change. The estimation of T/ET has been paid increasing attention from the scientific community in recent years globally. In this paper, we used the Priestly-Taylor Jet Propulsion Laboratory Model (PT-JPL) driven by regional remote sensing data and gridded meteorological data, to simulate the T/ET in forest ecosystems along the North-South Transect of East China (NSTEC) during 2001–2010, and to analyze the spatial distribution and temporal variation of T/ET, as well as the factors influencing the variation in T/ET. The results showed that: (1) The PT-JPL model is suitable for the simulation of evapotranspiration and its components of forest ecosystems in Eastern China, and has relatively good stability and reliability. (2) Spatial distribution of T/ET in forest ecosystems along NSTEC was heterogeneous, i.e., T/ET was higher in the north and lower in the south, with an averaged value of 0.69; and the inter-annual variation of T/ET showed a significantly increasing trend, with an increment of 0.007/yr (p<0.01). (3) Seasonal and inter-annual variations of T/ET had different dominant factors. Temperature and EVI can explain around 90% (p<0.01) of the seasonal variation in T/ET, while the inter-annual variation in T/ET was mainly controlled by EVI (53%, p<0.05).

Keywords

The North-South Transect of East China (NSTEC) forest ecosystems ratio of transpiration to evapotranspiration (T/ET) water use efficiency (WUE) 
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Notes

Acknowledgement

The flux data of CBS, QYZ, DHS sites were obtained from ChinaFLUX, and the simulated transpiration data of the three sites were provided by Dr. Xianjin Zhu and Prof. Guirui Yu, which are highly acknowledged.

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Copyright information

© Science in China Press 2019

Authors and Affiliations

  • Xiaoli Ren
    • 1
    Email author
  • Qianqian Lu
    • 2
  • Honglin He
    • 1
    • 3
  • Li Zhang
    • 1
    • 3
  • Zhongen Niu
    • 1
    • 4
  1. 1.Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources ResearchCASBeijingChina
  2. 2.Zhongke Tongde (Beijing) Ecology Technology Co.BeijingChina
  3. 3.College of Resources and EnvironmentUniversity of Chinese Academy of SciencesBeijingChina
  4. 4.University of Chinese Academy of SciencesBeijingChina

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