Dados do Trabalho

Título

ASSESSMENT OF SOIL DEGRADATION POTENTIAL FROM TIME SERIES OF BARE SOIL IMAGES

Resumo

Soil exposure is a significant factor in soil degradation because it is subject to environmental conditions such as solar radiation. Based on this statement, we aimed to correlate the frequency of soil exposure in the states of São Paulo and Paraná over 36 years (1985 - 2021) with field and remotely sensed environmental data. For that, multisource provided covariate to analyses, namely: Bare Soil Frequency (BSF), soil texture and surface temperature data from methodologies developed by the Group on Geotechnology in Soil Science (GEOCIS); climatic information from WorldClim; pedologic data from Embrapa legacy; Land Use and Land Cover (LULC) from MapBiomas open data. The previous results indicated some general and specific points that related the BSF to environmental covariates. In the analyzed period the State of Paraná demonstrated a lower exposure index than São Paulo due to the high adoption of a no-till system by Paraná. Regarding the soil texture factor, soils developed from sandstones in the upper horizons showed greater exposure compared to more clayey soils. This observation represents a high risk of degradation because sandy soils are more susceptible to climatic factor impacts, such as rain and solar radiation incidence. On the one hand, northwest Paraná had higher BSF values than other parts of the State. We attribute this behavior to LULC in that area had been mainly composed of sugarcane cropland, while the rest of Paraná predominated Silviculture. On the other hand, São Paulo had a higher average BSF. However, sugarcane croplands stayed less time with exposed soil in 2005. This fact occurred because of the mechanized harvesting expansion, which reduced burning, making the crop cycle less impactful to the soil. This set of covariates related to the BSF are essential tools for better soil management, favoring the conservation and maintenance of soil health.

Palavras-chave

Remote Sensing; Soil Degradation; Soil Health; Sustainability; Soil Management

Instituição financiadora

FAPESP

Agradecimentos

https://esalqgeocis.wixsite.com/geocis