Evaluating the models of stomatal conductance response to humidity in a tropical rain forest of Xishuangbanna, southwest China Academic Article uri icon

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abstract

  • The ecosystem-level fluxes of water vapour and carbon dioxide were measured from 2003 to 2006 at a tropical rain forest in Xishuangbanna, southwest China, using the eddy covariance (EC) technique. These flux measurements allowed the canopy-level evaluation of stomatal conductance (g) response to humidity models. The results showed that both the BWB model and the Leuning model discussed here underestimated g at high humidity and overestimated g at the mid-to-low range of humidity. In contrast, the Wang models discussed here (model-ha and model-Da) perfectly described the relationship of g response to humidity. The model comparison results also demonstrated high consistency over all the observation years. The good performance of the Wang model-ha and model-Da indicated that stomatal conductance responds more sensitively to humidity deficit or water vapour pressure deficit than to relative humidity itself at canopy level.

authors

  • Li, Zhiheng
  • Zhang, Yiping
  • Wang, Shusen
  • Yuan, Guofu
  • Yang, Yan
  • Yu, Guiri
  • Sun, Xiaomin

publication date

  • August 1, 2011