首页|The potential for an old-growth forest to store carbon in the topsoil:A case study at Sasso Fratino,Italy
The potential for an old-growth forest to store carbon in the topsoil:A case study at Sasso Fratino,Italy
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There is considerable interest devoted to old-growth forests and their capacity to store carbon(C)in biomass and soil.Inventories of C stocks in old-growth forests are carried out worldwide,although there is a lack of information on their actual potential for C sequestration.To further understand this,soil organic carbon(SOC)was measured in one of Italy's best-preserved old-growth forests,the Sasso Fratino Integral Nature Reserve.This reserve is on the World Heritage List along with other ancient beech forests of Europe,and it is virtually untouched due to the steepness of the terrain,even before legal constraints were imposed.Although the sandstone-derived soils are often shallow,they are rich in organic matter.However,no quan-tification had been carried out.By systematically sampling the topsoil across the forest,we accurately determined the average amount of SOC(62.0±16.9 Mg ha-1)and nitrogen(4.0±1.2 Mg ha-1)in the top 20 cm.Using the CENTURY model,future dynamics of SOC stocks were predicted to 2050 according to two climate scenarios,A1F1 and B2,the first of high concern and the second more optimistic.The model projected an increase of 0.2 and 0.3 Mg ha-1 a-1 by 2030 under the A1F1 and B2 scenarios,respectively,sug-gesting that the topsoil in old-growth forests does not reach equilibrium but continues accumulating SOC.However,from 2030 to 2050,a decline in SOC accumulation is pre-dicted,indicating SOC net loss at high altitudes under the worst-case scenario.This study confirms that soils in old-growth forests play a significant role in carbon sequestration.It also suggests that climate change may affect the potential of these forests to store SOC not only in the long term but also in the coming years.
Dipartimento per la Innovazione nei Sistemi Biologici,Agroalimentari e Forestali(DIBAF),Universita della Tuscia,Via San C.de Lellis Snc,01100 Viterbo,Italy
Dipartimento di Scienze e Tecnologie Agrarie,Alimentari,Ambientali e Forestali(DAGRI),Università degli Studi di Firenze,P.le delle Cascine 18,50144 Firenze,Italy
Italian Ministry of University and Research,Project PRIN 2008
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