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Agroforestry Systems

, Volume 92, Issue 2, pp 301–310 | Cite as

Carbon fractions as indicators of organic matter dynamics in chestnut orchards under different soil management practices

  • Olga Borges
  • Fernando Raimundo
  • João Coutinho
  • Berta Gonçalves
  • Ivo OliveiraEmail author
  • Afonso Martins
  • Manuel Madeira
Article

Abstract

Several studies have emphasized the negative impact of the conventional soil management (CT) system on productivity and sustainability of chestnut orchards (Castanea sativa Mill.) when compared to no-tillage with grass cover (NT). However, scarce information is available regarding the effects of these soil management systems on soil organic matter (SOM) dynamics and soil quality. SOM or soil organic carbon is a key component of soil quality and has different fractions with different lability, namely, organic C (POC), active C (AC) and hot-water extractable carbon (HWC). These are considered as indicators of changes in management-induced soil quality. Thus, a study was carried out to evaluate the effects of NT and CT systems applied in the chestnut orchards on: (i) total amount of soil organic C (TOC), including C from both organic and mineral layers; (ii) soil organic C concentration of mineral horizons (OC); (iii) labile soil organic fractions (POC, AC, HWC); (iv) and soil mineral-associated C. The study was developed in two 30-year old chestnut orchards located in Northeast Portugal, that were kept under different soil management systems (NT or CT) during the preceding 17 years. Soil samples were taken at 0–10 and 10–20 cm soil depth. No significant differences in OC concentration were observed between NT and CT, while TOC was significantly higher in NT than in CT (22.54 and 12.17 Mg/ha or 34.16 and 22.90 Mg/ha, considering the organic layer plus mineral layers at 0–10 and 0–20 cm depth (set of two depths). The NT practice led to significantly higher concentration of labile C fractions (POC, AC and HWC) than CT at 0–10 cm soil depth. These results indicate that measurement of labile soil organic C fractions, such as POC, AC and HWC, may provide a sensitive and consistent indication of changes in soil C and SOM dynamics in response to soil management practices. Overall, NT seems to ensure better soil quality than CT in chestnut orchards under Mediterranean climate conditions.

Keywords

Castanea sativa Labile soil organic carbon Soil quality Soil tillage 

Notes

Acknowledgements

This study was supported by: European Investment Funds by FEDER/COMPETE/POCI—Operacional Competitiveness and Internacionalization Programme, under Project POCI-01-0145-FEDER-006958 and National Funds by FCT—Portuguese Foundation for Science and Technology, under the Project UID/AGR/04033. The authors thank the staff of the Soil Laboratory of the Instituto Superior de Agronomia (Universidade de Lisboa) for the processing of some of the analyses. Mr. Lindolfo Afonso, landowner of the farm where the orchards are located, is acknowledged for the provided facilities to the study development and José Carlos Rego for assistance in field and laboratory activities.

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Copyright information

© Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  1. 1.Direção Regional de Agricultura e Pescas do NorteDelegação do Nordeste TransmontanoBragançaPortugal
  2. 2.Centre for the Research and Technology of Agro-Environmental and Biological Sciences - CITABUniversity of Trás-os-Montes e Alto Douro - UTADVila RealPortugal
  3. 3.Department of Biology and EnvironmentUniversity of Trás-os-Montes and Alto DouroVila RealPortugal
  4. 4.Centro de Estudos Florestais, Instituto Superior de AgronomiaUniversidade de LisboaLisbonPortugal

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