Abstract
Organic matter, an important component of healthy soils, may be used as an indicator in sustainability assessments. Managing soil carbon storage can foster agricultural productivity and environmental quality, reducing the severity and costs of natural phenomena. Thus, accurately estimating the spatial variability of soil organic matter (SOM) is crucial for sustainable soil management when planning agro-environmental measures at the regional level. SOM variability is very large in Italy, and soil organic carbon (SOC) surveys considering such variability are difficult and onerous. The study concerns the Abruzzo Region (about 10,800 km2), in Central Italy, where data from 1753 soil profiles were available, together with a Digital Elevation Model (DEM) and Landsat images. Some morphometric parameters and spectral indices with a significant degree of correlation with measured data were used as predictors for regression-kriging (RK) application. Estimated map of SOC stocks, and of SOM related to USDA (United States Department of Agriculture) texture—an additional indicator of soil quality—were produced with a satisfactory level of accuracy. Results showed that SOC stocks and SOM concentrations in relation to texture were lower in the hilly area along the shoreline, pointing out the need to improve soil management to guarantee agricultural land sustainability.
Highlights
One of the main challenges for the future is to maintain soil functions, but despite many efforts to promote more sustainable land management, soil degradation in the European Union (EU) is increasing [1], with a severe impact on food production and the supply of ecosystem services
Results showed that soil organic carbon (SOC) stocks and soil organic matter (SOM) concentrations in relation to texture were lower in the hilly area along the shoreline, pointing out the need to improve soil management to guarantee agricultural land sustainability
The 11 parameters and to indices derived from ancillary datasand
Summary
One of the main challenges for the future is to maintain soil functions, but despite many efforts to promote more sustainable land management, soil degradation in the European Union (EU) is increasing [1], with a severe impact on food production and the supply of ecosystem services. Among the soil properties impacting soil quality, soil organic carbon (SOC)—and soil organic matter (SOM). According to the Food and Agriculture Organization of the United Nations (FAO) [3], one of the characteristics of sustainable soil management (SSM) is a stable or increasing storage of SOM, ideally close to the optimal level for the local environment, for all land uses. The most efficient way to improve soil quality is to stimulate better SOM management
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