Estimation of carbon storage of forest biomass for voluntary carbon markets: preliminary results

Abstract

Estimating the carbon storage of forests is essential to support climate change mitigation and promote the transition into a low-carbon emission economy. To achieve this goal, voluntary carbon markets (VCMs) are essential. VCMs are promoted by a spontaneous demand, not imposed by binding targets, as the regulated ones. In Italy, only in Veneto and Piedmont Regions (Northern Italy), VCMs through forestry activities were carried out. Valle Camonica District (Northern Italy, Lombardy Region) is ready for a local VCM, but carbon storage of its forests was never estimated. The aim of this work was to estimate the total carbon storage (TCS; t C ha⁻¹) of forest biomass of Valle Camonica District, at the stand level, taking into account: (1) aboveground biomass, (2) belowground biomass, (3) deadwood, and (4) litter. We developed a user-friendly model, based on site-specific primary (measured) data, and we applied it to a dataset of 2019 stands extracted from 45 Forest Management Plans. Preliminary results showed that, in 2016, the TCS achieved 76.02 t C ha⁻¹. The aboveground biomass was the most relevant carbon pool (48.86 t C ha⁻¹; 64.27% of TCS). From 2017 to 2029, through multifunctional forest management, the TCS could increase of 2.48 t C ha⁻¹ (+ 3.26%). In the same period, assuming to convert coppices stands to high forests, an additional TCS of 0.78 t C ha⁻¹ (equal to 2.85 t CO₂ ha⁻¹) in the aboveground biomass could be achieved without increasing forest areas. The additional carbon could be certified and exchanged on a VCM, contributing to climate change mitigation at a local level.

Keywords

Carbon storage assessment / Forest management plan / Site-specific primary data / Voluntary carbon market / Climate change mitigation

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