CAPACITY OF C SEQUESTRATION OF CHESTNUT FORESTS LOCATED IN WESTERN SPAIN
The aim of this work was to study the variability and potential of C storage from the soils of Sweet chestnut coppices in Central-Western Spain, managed as coppices (timber production) or orchards (fruit production). Twenty-five chestnut coppices in the Old Kingdom of León and Extremadura (Western Spain) were selected at different altitudes and under different management systems. At those sites, we observed the depth of soil horizons, bulk densities and C and N contents of the epipedons. The results indicated that management has a strong effect on soil C contents (more than site), the soil C content of the epipedon varying between 4 and 93 mg C g-1. Principal component analysis revealed that the soil C and N contents were aligned opposite to management on the first axis, while local groupings were aligned jointly with latitude on the second axis. Accordingly, since these contents do not depend on location but rather on the use and management implemented, seven chestnut forests were chosen in Extremadura, in which the bulk density was also considered (results referred to Mg C ha-1 and to a soil depth of -80 cm). Thus, the maximum soil C content was 530 Mg C ha-1; this value is considered to be the maximum C-storage potential of the chestnut soils. Orchard soils may have values as low as 40 Mg C ha-1, indicating limitation in soil organic matter and then having potentiality of C storage; at least 150 Mg C ha-1 should be reached under an appropriate management regime.
Gallardo, J.F. and González Hernández, M.I. (2008). CAPACITY OF C SEQUESTRATION OF CHESTNUT FORESTS LOCATED IN WESTERN SPAIN. Acta Hortic. 784, 119-126
carbon storage, Castanea sativa, forest ecosystems, soil C accumulation, extremadura, chestnut orchards, chestnut coppices