Soil organic carbon stock assessment for the different cropland land uses in Italy |
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| Authors: | Tommaso Chiti Lorenzo Gardin Lucia Perugini Roberta Quaratino Francesco Primo Vaccari Franco Miglietta Riccardo Valentini |
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| Institution: | (1) Dipartimento di Scienze dell’Ambiente Forestale e delle sue Risorse (DISAFRI), Universit? della Tuscia, Via San C. De Lellis s.n.c, 01100 Viterbo, Italy;(2) Studio Gardin, via Guerrazzi 2R, 50132 Florence, Italy;(3) Istituto di Biometeorologia (Ibimet) del Consiglio Nazionale delle Ricerche (CNR), via G. Caproni 8, 50145 Florence, Italy;(4) FoxLab-Fondazione E. Mach, Via E. Mach, 1 38010 S. Michele all’Adige, Trento, Italy |
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| Abstract: | The aim of this work was to quantify the soil organic C (SOC) stock in the top 30 cm of mineral soil for the whole Italian
territory, according to the different land use types of the Intergovernmental Panel on Climate Change (IPCC) cropland category
(arable land, agroforestry, vineyards, olive groves, orchards and rice fields), as a basis for future land use scenarios and
to address mitigation policy at country level. A database for SOC stock was created with the data from the national project
denominated SIAS and partly from regional map reports. All data were referred to the year 2000 since they were derived from
surveys conducted from 1995 to 2005. The data were stratified according to the Italian climatic regions, the landscape position
and the IPCC cropland subcategories. Taking into account the uncertainty in the estimate, the mean SOC stock values of the
different subcategories show significant differences (p < 0.05) among climatic regions and landscapes, ranging from 41.9 ± 15.9 Mg C ha−1 in the vineyards to 63.3 ± 27.9 Mg C ha−1 in the rice fields. Generally, a small decrease of the SOC stock from the temperate regions toward the Mediterranean ones
is observed. Taking into account the mean value of each subcategory and the country area they occupied in 2000, the total
C stored in the upper 30 cm of soil was estimated at 490.0 ± 121.7 Tg C. The resulting estimate represents the 17% of the
value reported by another study for the soil of the whole country down to 50 cm depth, suggesting the importance of preserving
this large C pool. Considering the cropland category as a whole, the estimated mean SOC stock is 52.1 ± 17.4 Mg C ha−1, similar to that reported for other European countries, 50–60 Mg C ha−1. In conclusion, the assessment of the mean SOC stock of the different cropland land uses, landscape position and climate
regions could notably help when assessing the impact of different agricultural practices and future stock change evaluation. |
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