Journal of Geographical Sciences ›› 2019, Vol. 29 ›› Issue (11): 1807-1822.doi: 10.1007/s11442-019-1691-1

• Research Articles • Previous Articles     Next Articles

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

REN Xiaoli1, LU Qianqian2, HE Honglin1,3, ZHANG Li1,3, NIU Zhongen1,4   

  1. 1.Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
    2.Zhongke Tongde (Beijing) Ecology Technology Co., Beijing 100124, China
    3.College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100190, China
    4.University of Chinese Academy of Sciences, Beijing 100190, China
  • Received:2018-08-22 Accepted:2018-10-20 Online:2019-11-25 Published:2019-12-05
  • About author:Ren Xiaoli (1984–), PhD, E-mail: renxl@igsnrr.ac.cn
  • Supported by:
    National Key Research and Development Program of China(No.2015CB954102);National Natural Science Foundation of ChinaNo.41571424(No.31700417);National Natural Science Foundation of China(No.41571424)

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).

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