Soil organic carbon temperature sensitivity of different soil types and land use systems in the Brazilian semi-arid region
| Autor: | Leilane Kristine dos Santos Silva, Guilherme Bastos Lyra, Tâmara Cláudia de Araújo Gomes, Giordano Bruno Medeiros Gonzaga, Stoécio Malta Ferreira Maia |
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| Přispěvatelé: | STOECIO MALTA FERREIRA MAIA, GIORDANO BRUNO MEDEIROS GONZAGA, LEILIANE KRISTINE DOS SANTOS SILVA, GUILHERME BASTOS LYRA, TAMARA CLAUDIA DE ARAUJO GOMES, CPATC. |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Organic soils
Soil Science Climate change 010501 environmental sciences 01 natural sciences Soil respiration Soil Carbono 0105 earth and related environmental sciences Global warming Soil classification 04 agricultural and veterinary sciences Vegetation Soil carbon Soil type Pollution Arid Carbon Solo Matéria Orgânica Agronomy 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science Decomposição Agronomy and Crop Science |
| Zdroj: | Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA-Alice) Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
| Popis: | Quantifying the sensitivity of soil organic matter decomposition (SOM) to global warming is critical for predict future impacts of climate change on soil organic carbon stocks (SOC) and soil respiration, especially in semi-arid regions such as northeastern Brazil, where SOC stocks are naturally small. In this study, the responses of the labile and recalcitrant carbon components and soil respiration dynamics were evaluated in three different soil types and land use systems (native vegetation, cropland and pasture) of the Brazilian semi-arid region, when submitted to temperature increase. After 169 days of incubation, the results showed that an increase of 5°C generated an average increase in CO2 emission of 12.0%, but which could reach 28.1%. Overall, the labile carbon (LC) in areas of native vegetation showed greater sensitivity to temperature than in cropland areas. It was also observed that recalcitrant carbon (RC) was more sensitive to warming than LC. Our results indicate that Brazil's semi-arid region presents a substantial vulnerability to global warming, and that the sensitivity of RC and of LC in areas of native vegetation to warming can enhance SOC losses, contributing to positive feedback on climate change, and compromising the productive systems of the region. However, further studies evaluating other types of soil and texture and management systems should be carried out to consolidate the results obtained and to improve the understanding about SOM decomposition in the Brazilian semi-arid region. Made available in DSpace on 2021-01-14T09:02:27Z (GMT). No. of bitstreams: 1 2019-Maia-et-al-Soil-Use-and-Management.pdf: 643979 bytes, checksum: b4dcbbeca45a54ee0b266e957ebb3d61 (MD5) Previous issue date: 2019 |
| Databáze: | OpenAIRE |
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