Carbon stock increases up to old growth forest along a secondary succession in Mediterranean island ecosystems

PLoS One. 2019 Jul 24;14(7):e0220194. doi: 10.1371/journal.pone.0220194. eCollection 2019.

Abstract

The occurrence of old-growth forests is quite limited in Mediterranean islands, which have been subject to particularly pronounced human impacts. Little is known about the carbon stocks of such peculiar ecosystems compared with different stages of secondary succession. We investigated the carbon variation in aboveground woody biomass, in litter and soil, and the nitrogen variation in litter and soil, in a 100 years long secondary succession in Mediterranean ecosystems. A vineyard, three stages of plant succession (high maquis, maquis-forest, and forest-maquis), and an old growth forest were compared. Soil samples at two soil depths (0-15 and 15-30 cm), and two litter types, relatively undecomposed and partly decomposed, were collected. Carbon stock in aboveground woody biomass increased from 6 Mg ha-1 in the vineyard to 105 Mg ha-1 in old growth forest. Along the secondary succession, soil carbon considerably increased from about 33 Mg ha-1 in the vineyard to about 69 Mg ha-1 in old growth forest. Soil nitrogen has more than doubled, ranging from 4.1 Mg ha-1 in the vineyard to 8.8 Mg ha-1 in old growth forest. Both soil parameters were found to be affected by successional stage and soil depth but not by their interaction. While the C/N ratio in the soil remained relatively constant during the succession, the C/N ratio of the litter strongly decreased, probably following the progressive increase in the holm oak contribution. While carbon content in litter decreased along the succession, nitrogen content slightly increased. Overall, carbon stock in aboveground woody biomass, litter and soil increased from about 48 Mg ha-1 in the vineyard to about 198 Mg ha-1 in old growth forest. The results of this study indicate that, even in Mediterranean environments, considerable amounts of carbon may be stored through secondary succession processes up to old growth forest.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biomass
  • Carbon / analysis*
  • Ecosystem*
  • Environmental Monitoring / methods
  • Forests*
  • Humans
  • Mediterranean Islands
  • Nitrogen / analysis
  • Soil / chemistry*
  • Trees / chemistry*
  • Wood / chemistry*

Substances

  • Soil
  • Carbon
  • Nitrogen

Grants and funding

This work was supported by TEMPUS-1-2012-1-SK-TEMPUS-SMHES, grant 2012-3325/001-001 N.530397 to RV and PRIN 2018 "CARBOTREES", grant 20085FL4E4 to TLM. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.