Abstract
Water stress and nitrogen (N) availability are the two main factors limiting plant growth, and the two constrains can interact in intricate ways. Moreover, atmospheric N depositions are altering the availability of these limiting factors in many terrestrial ecosystems. Here, we studied the combined effects of different soil water availability and N supply on photosynthesis and water-use efficiency (WUE) in Picea asperata seedlings cultured in pots, using gas exchange, and stable carbon and nitrogen isotope composition (δ 13C and δ 15N). Photosynthesis under light saturation (A sat) and stomatal conductance (g s) of P. asperata decreased as the soil moisture gradually diminished. Under severe water-stress condition, N addition decreased the A sat and g s, whereas the positive effects were observed in moderate water-stress and well-watered conditions. The effect of N addition on the intrinsic WUE (WUEi) deduced from gas exchange was associated with soil water availability, whereas long-term WUE evaluated by leaf δ 13C only affected by soil water availability, and it would be elevated with soil moisture gradually diminished. Water deficit would restrict the uptake and further transport of N to the aboveground parts of P. asperata, and then increasing δ 15N. Therefore, δ 15N in plant tissues may reflect changes in N allocation within plants. These results indicate that the effect of N enrichment on photosynthesis in P. asperata is largely, if not entirely, dependent on the severity of water stress, and P. asperata would be more sensitive to increasing N enrichment under low soil water availability than under high soil moisture.
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Abbreviations
- A sat :
-
Photsynthetic rate under light saturation
- C i/C a :
-
The ratio of intercellular CO2 concentration and ambient CO2 concentration
- g s :
-
Stomatal conductance
- WUE:
-
Water use efficiency
- WUEi :
-
Intrinsic water use efficiency
- δ 13C:
-
Stable carbon isotope composition
- δ 15N:
-
Stable nitrogen isotope composition
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Acknowledgements
This research was supported by the National Natural Science Foundation of China (No. 31370495 and 31070533).
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Communicated by M Garstka.
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Tang, B., Yin, C., Yang, H. et al. The coupling effects of water deficit and nitrogen supply on photosynthesis, WUE, and stable isotope composition in Picea asperata . Acta Physiol Plant 39, 148 (2017). https://doi.org/10.1007/s11738-017-2451-4
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DOI: https://doi.org/10.1007/s11738-017-2451-4