Spatial distribution of coarse root biomass and carbon in a high-density olive orchard: effects of mechanical harvesting methods
The in situ 3D root architecture of Olea europea was described by a semi-automatic 3D digitizing approach, which permitted the estimation of the biomass and carbon content of coarse roots in the soil environment.
Coarse roots, the skeleton of the root system, are of primary importance for soil exploration and plant anchorage and only recently have been recognized as playing a major role in “long-term” carbon sequestration. Despite this role, the 3D architecture of coarse roots represents a gap in knowledge on the biomass and carbon allocation within the root system and, consequently, below-ground carbon sequestration capacity. Using a semi-automatic 3D digitizing approach (3 Space Fastrak plus Long Ranger), the 3D distribution in the soil environment of coarse root biomass and C content and how these parameters were affected by manual and mechanical (trunk shaker) harvesting methods were quantified in a high-density olive orchard. The below-ground C content at stand level was estimated to be 11.93 Mg C ha−1 and distributed at deeper soil layers (45–60 cm) in the form of first- and second-order branching roots. The present study also revealed that the mechanical harvesting method significantly increased both the angle of growth (0° = vertically downwards) of first-order lateral roots and the stump biomass, but neither the biomass allocation nor the C content was increased within the first three branching orders.
KeywordsRoot architecture Olive Harvesting method Carbon sequestration
The authors are grateful to the Chiaravalloti family for the making their farm available and for their warm hospitality. The authors also thank De Rossi A., Bartolo P., and Papandrea S. for their very useful work. The authors gratefully acknowledge the two anonymous referees for their valuable comments. We are also grateful to John Levy for revising and editing the text. Research was supported by Grants from Regione Calabria to Dr. Abenavoli L., project PSR 2007–2013—Misura 124 “Sistemi innovativi per la qualità della filiera dell’olio extravergine di oliva—SIFOLIO”.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflicts of interest.
- Abenavoli LM, Proto AR (2015) Effects of the diverse olive harvesting systems on oil quality. Agron Res 13:7–16Google Scholar
- Abenavoli LM, Cuzzupoli F, Chiaravalloti V, Proto AR (2016) Traceability system of olive oil: a case study based on the performance of a new software cloud. Agron Res 14:1247–1256Google Scholar
- Fabbri A, Bartolini G, Lambardi M, Kailis S (2004) Olive propagation manual. CSIRO, AustraliaGoogle Scholar
- Godin C, Gùedon Y, Costes E, Caraglio Y (1997) Measuring and analyzing plants with the AMAPmod software. In: Michalewicz M (ed) Advances in computational life science. vol I: Plants to ecosystems. CISRO, Australia, pp 63–94Google Scholar
- IOOC (2013) World table olive figures. International Olive Council. http://www.internationaloliveoil.org. Accessed 16 Feb 2017
- ISTAT, istituto Nazionale di Statistica (2016) Banche dati. http://agri.istat.it/sag_is_pdwout/jsp/consultazioneDati.jsp. Accessed October 2017
- Jimenez-Jimenez F, Blanco-Roldan GL, Castillo-Ruiz FJ et al (2015) Table olives mechanical harvesting with trunk shakers: orchard adaption and machine improvements. Chem Eng Trans 44:271–276Google Scholar
- Kovach WL (1994) Oriana for windows, ver. 2.01. Kovach Computing Services, Pentraeth, WalesGoogle Scholar
- Mardia KV, Jupp PE (2000) Directional statistics. Wiley, ChichesterGoogle Scholar
- Michelakis N, Vougioucalou E (1988) Water use, root and top growth of olive trees for different methods of irrigation and levels of soil water potential. Olea 19:17–31Google Scholar
- Sokal RR, Rohlf FJ (1995) Biometry: the principles and practice of statistics in biological research. Freeman, New YorkGoogle Scholar
- Turrini A, Caruso G, Avio L, Gennai C, Palla M, Agnolucci M, Tomei PE, Giovannetti M, Gucci R (2017) Protective green cover enhances soil respiration and native mycorrhizal potential compared with soil tillage in a high-density olive orchard in a long term study. Appl Soil Ecol 116:70–78CrossRefGoogle Scholar