Taking pioneer plant Neyraudia reynaudiana on soil and water conservation as test material,with pot experiment test for four level drought stress to study the effects of photosynthetic characteristics of Neyraudia reynaudiana with photosynthetic pigments,chlorophyll fluorescence parameters and photosynthetic parameters.Results showed that chlorophyll content of Neyraudia reynaudiana increased and chlorophyll a/b decreased under moderate and mild drought stress.Chlorophyll fluorescence parameters F0,Fm,Fv in...