Abstract
Water deficit is one of the major limiting factors in vegetation recovery and restoration in loess, hilly-gully regions of China. The light responses of photosynthesis in leaves of two-year old Prunus sibirica L., Hippophae rhamnoides L., and Pinus tabulaeformis Carr. under various soil water contents were studied using the CIRAS-2 portable photosynthesis system. Light-response curves and photosynthetic parameters were analyzed and fitted using the rectangular hyperbola model, the exponential model, the nonrectangular hyperbola model, and the modified rectangular hyperbola model. Under high light, photosynthetic rate (P N) and stomatal conductance (g s) were steady and photoinhibition was not significant, when the relative soil water content (RWC) varied from 56.3–80.9%, 47.9–82.9%, and 33.4–92.6% for P. sibirica, H. rhamnoides, and P. tabulaeformis, respectively. The light-response curves of P N, the light compensation point (LCP), and the dark respiration rate (R D) were well fitted using the above four models. The nonrectangular hyperbola was the best model in fitting the data; the modified rectangular hyperbola model was the second, and the rectangular hyperbola model was the poorest one. When RWC was higher or lower than the optimal range, the obvious photoinhibition and significant decrease in P N with increasing photosynthetic photon flux density (PPFD) were observed in all three species under high light. The light saturation point (LSP) and apparent quantum yield also decreased significantly, when the upper limit of PPFD was 200 μmol m−2 s−1. Under these circumstances, only the modified rectangular hyperbola model was able to fit well the curves of the light response, LCP, LSP, R D, and light-saturated P N.
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Abbreviations
- FC:
-
field capacity
- g s :
-
stomatal conductance
- GWC:
-
gravitational water content
- LCP:
-
light compensation point
- LSP:
-
light saturation point
- MAE:
-
mean absolute error
- MSE:
-
mean square error
- P N :
-
net photosynthetic rate
- P Nmax :
-
lightsaturated net photosynthetic rate
- PPFD:
-
photosynthetic photon flux density
- R D :
-
dark respiration rate
- RWC:
-
relative water content
- SWC:
-
soil water content
- VWC:
-
volumetric water content
- Φ:
-
apparent quantum yield
- Φc :
-
quantum yield at the light compensation point
- Φc0 :
-
absolute value of the slope of the photosynthetic rate-light-response curve between zero irradiance and LCP
- Φ0 :
-
quantum yield at zero irradiance
- ΦPPFD≤120 :
-
apparent quantum yield by the upper limit of PPFD of 120 μmol m−2 s−1
- ΦPPFD≤160 :
-
apparent quantum yield by the upper limit of PPFD of 160 μmol m−2 s−1
- ΦPPFD≤200 :
-
apparent quantum yield by the upper limit of PPFD of 200 μmol m−2 s−1
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Acknowledgements: This study was supported by the China “973” projects (No. 2012CB955404, No. 2012CB416904) and the National Science Foundation of China (No. 30872003). Y. Lang and M. Wang contributed equally to this work.
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Lang, Y., Wang, M., Zhang, G.C. et al. Experimental and simulated light responses of photosynthesis in leaves of three tree species under different soil water conditions. Photosynthetica 51, 370–378 (2013). https://doi.org/10.1007/s11099-013-0036-z
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DOI: https://doi.org/10.1007/s11099-013-0036-z