| Autor: |
Oresca, Denizard, Souza, Eduardo Soares de, Souza, Rodolfo Marcondes Silva, Silva, José Raliuson Inácio, Moura, Débora Purcina de, Sampaio, Everardo Valadares de Sá Barreto, Hammecker, Claude, Lima, José Romualdo de Sousa, Menezes, Rômulo Simões Cezar, Pessoa, Luiz Guilherme Medeiros, Ferrão, Natache Gonçalves de Moura, Antonino, Antônio Celso Dantas |
| Zdroj: |
Sustainability (2071-1050); Dec2024, Vol. 16 Issue 23, p10652, 19p |
| Abstrakt: |
The Caatinga biome has been severely devastated over the years due to the replacement of native dry forests with grassland areas in the Brazilian semiarid region. Despite this, variations in key soil quality indicators still need to be fully elucidated. We evaluated soil and root respiration dynamics in grassland (GR), agroforestry (AS), and Caatinga forest (CA) areas, during dry and rainy seasons. In situ, monthly CO 2 flux (total, root, and heterotrophic respirations), soil moisture (θ v), and temperature ( T s o i l ) were measured. Soil samples were collected every 5 cm layer up to 20 cm depth to analyze total organic carbon (TOC) and microbial activities. The highest parameter values occurred during the rainy season. Total soil respiration was highest in AS, followed by CA and then GR, with 19.3, 13.4, and 8.4 ton C h a − 1 y r − 1 , respectively, and root respiration contributed 33.2 and 32.9% to total soil respiration in CA and AS, respectively. However, TOC concentrations and microbial activity were significantly higher in AS than in GR and similar to CA, more than compensating the C losses by respiration. Therefore, agroforestry systems have a high potential for semiarid lands because they preserve soil carbon and microbial activity comparable to Caatinga forests. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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