Abstract
Background and aims
Fruit orchards potential as carbon (C) sinks is virtually unknown. Moreover, despite their importance in the Mediterranean area, few data are available about the effect of the reduction in water availability on fruit tree productivity. Here we report the effect of two different irrigation regimes on net primary (NPP) and net ecosystem (NEP) productivities of an apple orchard in northern Italy in 2006.
Methods
Trees productivity and heterotrophic soil respiration were estimated by inventory and root exclusion methods, while belowground allocation with a C mass-balance approach.
Results
The NPP of the control (7.86 ± 0.25 Mg C ha-1; mean ± SE) was significantly greater than that of water stressed trees (6.53 ± 0.12 Mg C ha-1), and the ratio between above and below net primary productivity (ANPP/BNPP) was 1.88 and 0.98 respectively. However, the partitioning of ANPP and BNPP among aerial organs and among fine, coarse roots, and root litter was unaffected by the water regime. Although NEP was greater in the control than in stressed trees the C gain of the system after fruit removal (NEPafr) was unaffected by water availability.
Conclusions
This study indicated an effect of water availability on C partitioning patterns above- and belowground, although there were no significant effects on the C sink potential as NEPafr.
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Abbreviations
- ANPP:
-
Aboveground net primary productivity
- BNPP:
-
Belowground net primary productivity
- NPP:
-
Net primary productivity
- NEP:
-
Net ecosystem productivity
- NEPafr :
-
Net ecosystem productivity after fruit removal
- TBCA:
-
Total belowground carbon allocation
- Ccr :
-
Carbon in coarse roots
- Cfr :
-
Carbon in fine roots
- Cff :
-
Carbon in fruit
- Clf :
-
Carbon in litterfall
- Cr :
-
Carbon in root standing biomass
- Crf :
-
Carbon input from roots to soil
- Csoil :
-
Carbon in soil
- Csb :
-
Carbon in annual shoots
- Csw :
-
Carbon in aboveground woody organs
- DOY:
-
Day of the year
- Fr :
-
Rhizosphere associated soil respiration
- Fs :
-
Total soil respiration
- Fsoc :
-
SOM-derived soil respiration
- SOC:
-
Soil organic carbon
- SOM:
-
Soil organic matter
- TLA:
-
Total leaf area
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Acknowledgements
The research was funded by the Italian Ministry of University and Research through the National Project "PRIN 2004, Carbon cycle in managed tree ecosystems". We thank Enrico Muzzi (University of Bologna) for the support in the statistical analysis, Dr. Christian Davies (Shell Research Ltd.) for the preliminary review of the manuscript and two anonymous reviewers for their valuable comments.
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Panzacchi, P., Tonon, G., Ceccon, C. et al. Belowground carbon allocation and net primary and ecosystem productivities in apple trees (Malus domestica) as affected by soil water availability. Plant Soil 360, 229–241 (2012). https://doi.org/10.1007/s11104-012-1235-2
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DOI: https://doi.org/10.1007/s11104-012-1235-2