Photosynthetica 2005, 43(2):289-291 | DOI: 10.1007/s11099-005-0047-5

Photosynthesis, transpiration, and water use efficiency of Leymus dasystachys on the Hunshandake desert

R. Z. Wang1, X. Q. Liu1, Q. Xing2, Y. Bai3
1 Laboratory of Quantitative Vegetation Ecology, Institute of Botany, the Chinese Academy of Sciences, Xiangshan, Beijing, China
2 Beijing Botanical Garden, Institute of Botany, the Chinese Academy of Sciences, Xiangshan, Beijing, China
3 Department of Plant Sciences, University of Saskatchewan, Saskatoon, Sask., Canada

Net photosynthetic rate (PN), transpiration rate (E), and stomatal conductance (gs) declined from upper leaves to the lower ones during dry and rainy seasons, indicating that long-term carbon budget should take into account PN variations for different leaf types. Relatively greater PN in the dry season suggested that this species is more able to maintain higher PN under drought, but the relatively higher E in the dry season might reduce water use efficiency (PN/E) for the species. Significant correlations between PN and gs indicated that gs may be the critical factor for PN variability in the desert region.

Additional key words: dry and rainy seasons; leaf age and insertion; stomatal conductance

Received: October 21, 2004; Accepted: January 28, 2005; Published: June 1, 2005  Show citation

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Wang, R.Z., Liu, X.Q., Xing, Q., & Bai, Y. (2005). Photosynthesis, transpiration, and water use efficiency of Leymus dasystachys on the Hunshandake desert. Photosynthetica, 43(2), 289-291. doi: 10.1007/s11099-005-0047-5
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