Abstract:

In order to provide basic data for wild plant resources protection and cultivation of Salvia paohsingensis, the photosynthetic characteristics were studied with the Li-6400 portable photosynthesis system in this paper. The net photosynthetic rate (Pn) was measured under different light intensities condition, and then drawing the curve of Pn respond to light intensities according to the results. The diurnal variation of Pn was measured at sunny day from 8:30a.m.-17:30p.m. The results showed that the Pnmax, Rd, LCP, LSP and AQY of S. paohsingensis were 27.30μmol?m-2?s-1, -2.24μmol?m-2?s-1, 40.09μmol?m-2?s-1, 1600μmol?m-2?s-1 and 0.0512 respectively. S. paohsingensis had the strong utilization efficiency on weak light．Diurnal course curves of S. paohsingensis net photosynthetic rate had two peaks. The “midday depression” of S. paohsingensis was belonged to stomatal limitation. Among the ecological factors and the physiological factors, RH and Ci were the key ones that influenced the Pn of S. paohsingensis. To ease “midday depression” and increase production of S. paohsingensis, some tall crops should be intercropped.