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| Titel |
Influence of soil sampling approaches in the evaluation of soil organic
carbon stocks under different land uses in a Mediterranean area |
| VerfasserIn |
Rosa Francaviglia, Luca Doro, Luigi Ledda, Luis Parras-Alcántara, Beatriz Lozano-García |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250124304
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| Publikation (Nr.) |
 EGU/EGU2016-3719.pdf |
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| Zusammenfassung |
| Different approaches of soil sampling can provide significantly different estimates of soil
organic carbon stocks (SOCs) (Parras-Alcántara et al., 2015a). Many studies have focused on
SOC distribution only in the biologically active layers of topsoil, the IPCC carbon accounting
method estimates the change in SOC storage for the top 30 cm of a soil profile, and indeed
limited data are available for SOCs below this depth. Moreover, SOC estimates are more
uncertain in areas with heterogeneous land uses and pedoclimatic conditions such as
Mediterranean environments, which are more prone to land degradation due to SOC
degradation and depletion and erosive processes (Muñoz-Rojas et al., 2015). Anyhow, the
open question is whether soil should be sampled following the pedogenetic horizons with soil
entire soil approach (ESP), or along fixed depth increments using the soil control section
method (SCS) (Parras-Alcántara et al., 2015b). In addition, SOCs are often not
adjusted for the soil volume occupied by coarse fragments as recommended by
the IPCC Good Practice Guidance for LULUCF (IPCC, 2003) accordingly to the
equation:
SOCs = SOC (g kg−1) × bulk density (Mg m−3) × depth (m) × (1 – coarse
fragment) × 10.
The work deals with the comparison of SOCs using the ESP and SCS approaches, applied
to a study area of northeastern Sardinia (Italy) under typical agro-silvo-pastoral systems
(Francaviglia et al., 2014). The area lies within a hilly basin where elevation is in the
range 275-340 m a.s.l., and slope ranges from 2-6% to 16-30%. The local climate is
warm temperate with dry and hot summers, mean annual rainfall is 623 mm (range
367-811mm) and mean annual temperature is 15.0˚ C (13.8-16.4˚ C). The area
has the same soil type (Haplic Endoleptic Cambisols, Dystric) according to IUSS
Working Group WRB (2006), and the following land uses with different levels of
cropping intensification were compared: Tilled vineyards (Tv), No-tilled grassed
vineyards (Ntgv), Hay crop (Hc), Pasture (P), Cork oak forest (Cof), former vineyards
revegetated by Scrublands (Sfv), Mediterranean Maquis (Mmfv), and Helichrysum
meadows (Hmfv). Average total SOCs were 128.0 and 140.6 Mg ha−1with the ESP and
SCS approaches respectively if the coarse fraction is not included in the equation,
79.0 and 90.4 Mg ha−1when the coarse fraction is included. This indicates the
importance to consider the coarse fraction when estimating SOC stocks, and an
overestimation of SOCs when SCS sampling approach is adopted equal to about
16%.
References
Francaviglia, R., Benedetti, A., Doro, L., Madrau, S., Ledda, S., 2014. Influence of land
use on soil quality and stratification ratios under agro-silvo-pastoral Mediterranean
management systems. Agriculture, Ecosystems and Environment 183, 86-92.
Intergovernmental Panel on Climate Change (IPCC), 2003. In: Penman, J., Gytarsky, M.,
Hiraishi, T., Krug, T., Kruger, D., Pipatti, R., Buendia, L., Miwa, K., Ngara, T., Tanabe, K.,
Wagner, F. (Eds.), Good Practice Guidance for Land Use, Land Use Change and Forestry.
IPCC/OECD/IEA/IGES, Hayama, Japan.
IUSS Working Group WRB, 2006.World reference base for soil resources 2006.World
Soil Resources Reports No. 103. FAO, Rome.
Muñoz-Rojas, M., Doro, L., Ledda, L., Francaviglia, R., 2015. Application of
CarboSOIL model to predict the effects of climate change on soil organic carbon stocks in
agro-silvo-pastoral Mediterranean management systems. Agriculture, Ecosystems and
Environment 202, 8-16.
Parras-Alcántara, L., Lozano-García, B., Brevik, E. C., Cerdá, A., 2015a. Soil organic
carbon stocks quanti?cation in Mediterranean natural areas, a trade-off between entire soil
pro?les and soil control sections. EGU General Assembly. Geophysical Research Abstracts
Vol. 17, 2015-9865.
Parras-Alcántara, L., Lozano-García, B., Brevik, E., C., Cerdá, A., 2015b. Soil organic
carbon stocks assessment in Mediterranean natural areas: A comparison of entire soil profiles
and soil control sections. Journal of Environmental Management, 155, 219-228. |
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