Abstract:Ordas plateau is a typical dry and semi dry sandland in China.The distribution pattern and productivity of terrestrial ecosystem are greatly affected by the global change,especially the global precipitation change.Response is investigated for seedlings of Salix psammophila ,a dominant shrub in Ordas plateau,to the global precipitation change by artificially controlling water supply at four levels.The results show that photosynthetic rate,transpiration rate,stomatal conductance and fluorescence efficienc...