Chin J Plan Ecolo ›› 1999, Vol. 23 ›› Issue (5): 401-410.

• Research Articles • Previous Articles     Next Articles

A Comparison of Transpiration, Photosynthesis and Transpiration Efficiency in Four Tree Species in the Loess Region

WANG Meng-Ben, LI Hong-Jian, CHAI Bai-Feng and FENG Cai-Ping   

  • Published:1999-05-10
  • Contact: LI Zhi-An

Abstract: The diurnal course of transpiration rate generally showed a pattern of single peak and had a close relationship with Li (light intensity) in the species: P, hopeiensis, P. simonii,P, beijingensis and C. korshinskii. The four sorts of optimal models of transpiration rate consisted of the independent variable of Li; the independant variables of Li and T(temperature),the independent variables of Li and RH(relative humidity),and the independant variables of Li, T and RH, respectively. These four species had the transpiration rates (g·g-1LD·h-1) in the following order: C. korshinskii ( 0.9269 ± 0.2089 ) (mean ± 1 SD ) > P. simonii ( 0.7177 ± 0.2410 ) > P. hopeiensis (0.6256 ± 0.1609) >P. beijingensis (0.6007 ±0.2749); the net photosynthesis rate (mgCO2 ·g-1LD·h-1) was C. korshinskii(14.5949±4.6627)>P.simonii(13.4055±2.9994)>P. hopeiensis (13.2569 ±4.3531) > P. beijingensis (11.6989 ± 2.5884); and the transpiration efficiency (gDM·g-1H2O) was P. beijingensis (1.41% ± 0.42%)>P. hopeiensis(1.35%±0.36%)>P.simonii (1.26%±0.23%)>C. korshinskii (1.00%±0.27%).