Characterization of photosynthesis of Populus euphratica grown in the arid region

Abstract

Net photosynthetic rate (P N ), stomatal conductance (g s ), intercellular CO 2 concentration (C i ), transpiration rate (E), water use efficiency (WUE), and stomatal limitation (L s ) of Populus euphratica grown at different groundwater depths in the arid region were measured. g s of the trees with groundwater depth at 4.74 m (D 4 ) and 5.82 m (D 5 ) were lower and a little higher than that at 3.82 m (D 3 ), respectively. Compared with C i and L s of the D 3 trees, C i decreased and L s increased at 4.74 m, however, Ci increased and L s decreased at D 5 . Hence photosynthetic reduction of P. euphratica was attributed to either stomatal closure or non-stomatal factors depending on the groundwater depths in the plant locations. P N of the D 3 trees was significantly higher than those at D 4 or D 5 . The trees of D 4 and D 5 did not show a significant difference in their P N , indicating that there are mechanisms of P. euphratica tolerance to mild and moderate drought stress.

Relationships between foliar carbon isotope discrimination with potassium concentration and ash content of the riparian plants in the extreme arid region of China

“…Decay of P. euphratica and T. ramosissima has seriously affected the survival of the Ejina desert riparian oasis. More and more researches deal with photosynthetic , Deng et al 2003, Chen et al 2006, water-use (Si et al 2005a,b;, ecophysiological, and biochemical response to water stress (Devitt et al 1998, Horton et al 2001, Chen et al 2003a, Wang et al 2007 and to the salt one (Ma et al 1997, Shin et al 2000, Chen et al 2004) as well as to both of them (Zhuang et al 2007). Some results are greatly useful to preserve and restore the desert riparian vegetation.…”

Growth, photosynthesis, and ion distribution in hydroponically cultured Populus alba L. cuttings grown under various salinity concentrations

“…Studies on these species have been conducted over several decades regarding their ecological physiology, including photosynthesis and respiration (Fung et al 1998;Chen et al 2006;Wang et al 2007), chemical stresses caused by atmospheric acidification (Patton and Garraway 1986;Chappelka et al 1988;Rizzo et al 2007), water stress (Cannon and Roberts 1995;Maxwell et al 1997), and flooding (Liu and Dickmann 1993;Cao and Connerb 1999). In northwest China, studies on salt tolerance of Populus species, mainly P. euphratica, have increased as a result of soil salinization in arid and semiarid regions (Ma et al 1997;Fung et al 1998;Chen et al 2003a, b;Yu et al 2006).…”

Parameterization of a coupled CO<sub>2</sub> and H<sub>2</sub>O gas exchange model at the leaf scale of <i>Populus euphratica</i>

“…P. euphratica is characterized by a great resistance to drought, high irradiance and temperature, wind, and salinity in the soils, and is very important in maintaining ecosystem function in arid and semi-arid regions (Chen et al, 2004). Comparative studies have been carried out to determine the responses of P. euphratica to salt and drought stress (Ma et al, 2002;Chen et al, 2004Chen et al, , 2006. However, efforts to use the gas-exchange data of P. euphratica leaves to determine the biochemical model parameters and their temperature dependences are lacking.…”