Responses of dominant desert species Artemisia ordosica and Salix psammophila to water stress
Xiao, C.W.(Chinese Academy of Sciences, Beijing (China))E-mail:[email protected] | Zhou, G.S. | Zhang, X.S. | Zhao, J.Z. | Wu, G.
Morphology, biomass accumulation and allocation, gas exchange, and chlorophyll fluorescence were compared for one-year-old seedlings of Salix psammophila and Artemisia ordosica in response to two water supplies (equivalent to 315.0 mm for present precipitation in growing season and to 157.5 mm for future decreasing precipitation) during 105 d. In both species, photochemical efficiency of photosystem 2, net photosynthetic rate, transpiration rate, stomatal conductance, biomass accumulation in different organs, tree height, number of leaves, and leaf area were reduced in response to the decrease in water supply. Diurnal patterns of gas exchange and biomass allocation were affected in different ways in the two species, with notably a decrease in specific leaf area and an increase in root:shoot ratio in S. psammophila only. Overall, S. psammophila was more responsive to the decreasing precipitation than A. ordosica.
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