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Master Thesis

Évaluation et cartographie des services écosystémiques fournis par les sols

Abstract : Soil is a natural resource providing several ecosystem services (ES). This study aims to assess and map 2 ES provided by soils of Pleine-Fougères study area: climate regulation and control of erosion. Biophysical quantification of climate regulation support on the indicator of soil organic carbon (SOC) stock changes over a period of 7 years. The characterization of this indicator reveals SOC stocks increases higher than national references. Indeed, this service is estimated at 1.65 t / ha / year for grassland, 1.17 t / ha/ year and 0.85 t / ha / year respectively for the land used for corn and cereals. In addition, to map this ES, two approaches have been implemented: the first is to spatialize the indicator using a soil digital mapping approach with the Random Forest method (R² = 0.47) and a calibration dataset of 64 points. This model uses soil hydromorphy and landuse as explanatory factors of its spatial distribution. The second approach is to assign a value of the indicator for each type of land occupation. Furthermore, the control of erosion, estimated by RUSLE model, is defined by the difference between the potential and the actual erosion. The average provision of this ES is estimated at 10 t / ha / year and the highest values recorded for landscape areas located in steep slopes. Moreover, the study of the interrelationships of synergies and antagonism with standardization scores shows that the interaction described by Medium / Medium is the most present on the site. Thus, despite uncertainties associated with the biophysical evaluation of 2 SES, the results have characterized the major landscape features of the site while management units disappeared.
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Master Thesis
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Submitted on : Tuesday, December 6, 2016 - 10:52:55 AM
Last modification on : Monday, July 6, 2020 - 3:38:21 PM
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  • HAL Id : dumas-01409703, version 1



Yosra Ellili. Évaluation et cartographie des services écosystémiques fournis par les sols. Science des sols. 2016. ⟨dumas-01409703⟩



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