Photosynthesis,transpiration, and water use efficiency of <Emphasis Type="Italic">Leymus dasystachys</Emphasis> on the Hunshandake desert |
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| Authors: | R Z Wang X Q Liu Q Xing Y Bai |
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| Institution: | (1) Laboratory of Quantitative Vegetation Ecology, Institute of Botany, the Chinese Academy of Sciences, No. 20 Nanxincun, Xiangshan, Beijing, 100093, China;(2) Beijing Botanical Garden, Institute of Botany, the Chinese Academy of Sciences, No. 20 Nanxincun, Xiangshan, Beijing, 100093, China;(3) Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, Sask., S7N 5A8, Canada |
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| Abstract: | Net photosynthetic rate (P
N), transpiration rate (E), and stomatal conductance (g
s) declined from upper leaves to the lower ones during dry and rainy seasons, indicating that long-term carbon budget should take into account P
N variations for different leaf types. Relatively greater P
N in the dry season suggested that this species is more able to maintain higher P
N under drought, but the relatively higher E in the dry season might reduce water use efficiency (P
N/E) for the species. Significant correlations between P
N and g
s indicated that g
s may be the critical factor for P
N variability in the desert region. |
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| Keywords: | dry and rainy seasons leaf age and insertion stomatal conductance |
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