Dados do Trabalho

Título

Soil Basal Respiration in Biodiverse Successional Agroforestry Systems

Resumo

Successional agroforestry systems (SAFS) tend to have a dynamic ecological successional similar to natural restoration. Soil basal respiration (SBR) can be useful as an indicator of the biological quality of such systems. We evaluated SBR in SAFS with different times of management in different seasons. The study was conducted in Florianópolis, Southern Brazil, in FLUVIC NEOSOLS. The SAFS, with one, four, and six years of establishment, have tree species in the central rows and green manure species in the inter rows, and SBR was assessed in summer, autumn, winter, and spring. The central rows had higher SBR than the inter rows, probably due to the heterogeneity of tree roots compared to the annual species in the inter rows. The SAFS with one and six years of establishment showed higher SBR than those with four years. That may be due to the higher species density in the one-year system, while the six-year system is more stable due to its longer establishment time and heterogeneity. The highest SBR values occurred in Spring and Autumn, probably due to lower variation in environmental conditions compared to summer and winter, which have more extreme temperatures. The time after establishment, seasons of the year and rows affect SBR in SAFS. As the SAFS ecological succession progresses, the stability increases, as indicated by the high soil basal respiration, which is more representative in intermediate seasons.

Palavras-chave

SAFS; ecological succession; soil microbiology; SBR.

Instituição financiadora

CAPES

Agradecimentos

CAPES