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Diurnal and seasonal variations in photosynthetic characteristics of switchgrass in semiarid region on the Loess Plateau of China

  • Original Papers
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Photosynthetica

Abstract

In order to use rationally switchgrass (Panicum virgatum L.) introduced in a large scale in semiarid regions on the Loess Plateau of China, we investigated and compared soil water storage dynamics, diurnal and seasonal changes in leaf photosynthetic characteristics, and biomass production of switchgrass grown under three different row spacing (20, 40, and 60 cm). Results indicated that photosynthetic parameters showed a pronounced seasonality. Diurnal course of net photosynthetic rate (P N) was bimodal, showing obvious midday depression, which was mainly due to stomatal limitation in May and June, by nonstomatal limitation in August, and both stomatal and nonstomatal factors in September. Generally, P N, stomatal conductance, instantaneous water-use efficiency, light-saturated net photosynthetic rate, saturation irradiance, and compensation irradiance increased with increasing row spacing. Plant height, leaf width, and a relative growth rate of biomass accumulation were significantly higher at the row spacing of 60 cm, while 20 cm spacing showed significantly higher aboveground biomass production and the biomass water-use efficiency. All these confirmed that soil water is the key limiting factor influencing switchgrass photosynthesis, and suggested that the wide row plantation (i.e., 60 cm) was more beneficial to switchgrass growth, while narrow spacing was in favor of improving switchgrass productivity and water-use efficiency.

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Abbreviations

AQE:

apparent quantum efficiency

C i :

intercellular CO2 concentration

E :

transpiration rate

g s :

stomatal conductance

I c :

compensation irradiance

I s :

saturation irradiance

L20:

row spacing of 20 cm

L40:

row spacing of 40 cm

L60:

row spacing of 60 cm

Ls :

stomatal limitation value

P N :

net photosynthetic rate

P Nmax :

light-saturated net photosynthetic rate

R D :

dark respiration rate

RH:

air relative humidity

SWS:

soil water storage

T air :

air temperature

VPD:

leaf to air vapor pressure deficit

WUE:

instantaneous water-use efficiency

WUEb :

biomass water-use efficiency

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Authors and Affiliations

  1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, Shaanxi, 712100, China

    Z. J. Gao, B. C. Xu & L. J. Huo

  2. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi, 712100, China

    B. C. Xu & S. Li

  3. Shaanxi Institute of Zoology, Xi’an, Shaanxi, 710032, China

    J. Wang

Authors
  1. Z. J. Gao
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  2. B. C. Xu
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  3. J. Wang
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  4. L. J. Huo
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  5. S. Li
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Corresponding author

Correspondence to B. C. Xu.

Additional information

Acknowledgements: This work was financially supported by National Science Foundation of China (41371509), Programs for New Century Excellent Talents in University (NECT-11-0444) and Fundamental Research Funds for the Central Universities (ZD2013020).

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Gao, Z.J., Xu, B.C., Wang, J. et al. Diurnal and seasonal variations in photosynthetic characteristics of switchgrass in semiarid region on the Loess Plateau of China. Photosynthetica 53, 489–498 (2015). https://doi.org/10.1007/s11099-015-0108-3

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  • DOI: https://doi.org/10.1007/s11099-015-0108-3

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