Mapping landscape features related to soil carbon using ASTER thermal infrared images.
Climatic change derived from greenhouse gases (GHG) anthropogenic emissions consists in one of the main concerns of public policy makers. In Brazil, agricultural activities and livestock are responsible for 23% of gross GHG emissions, and land use and soil management are the main factors that drive these emissions levels. Soil carbon is mainly stocked as soil organic matter (SOM), and SOM stocks are related to clay content in soil and soil management. In order to improve the monitoring of these factors, we propose the use of ASTER TIR images data to map quartz, phyllosilicated clays, and non-photosynthetically active vegetation (NPAV) in order to assess remote sensing techniques to large-scale mapping of environments with greater or less soil carbon accumulation. We used thermal bands ratios to get quartz, phyllosilicated clays, and NPAV image fractions, that were compared to ASTER VNIR images and to the soil classes map of the study area. Results show that areas with higher values in quartz image fraction are related to bare soils areas in quartz-enriched soils. Higher values in phyllosilicates image fraction are related to bare soils areas with clay soils and higher values in NPAV image fraction are consistent to the vegetation activity throughout the study area, including crop residues areas detected in large-scale farms.
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Separatas biblioteca |
| Language: | English eng |
| Published: |
2018-01-10
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| Subjects: | Spectral indices, Phyllosilicates, Non photosynthetically active vegetation, Índices espectrais, Quartzo, Filossilicatos, Vegetação não fotossinteticamente ativa, Imagem de satélite, Quatz., Sensoriamento remoto, Solo, Carbono., Remote sensing, Carbon, Soil, Agriculture., |
| Online Access: | http://www.alice.cnptia.embrapa.br/alice/handle/doc/1084953 |
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