Banca de DEFESA: JOÃO GABRIEL DE SOUZA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JOÃO GABRIEL DE SOUZA
DATE: 30/01/2025
TIME: 09:00
LOCAL: Sala de Aula 01 do PPEAMB, 1º andar do Prédio Antônio Coelho, do Departamento de Tecnologia Rural
TITLE:

Agroforestry as a strategy for carbon sequestion, little production and microbial activity

KEY WORDS:

Environmental sustainability, biomass, conservation systems.

PAGES: 46
BIG AREA: Engenharias
AREA: Engenharia Sanitária
SUMMARY:

Understanding carbon flows in biomass is essential for land use management and the promotion of environmental services, such as carbon storage and sequestration. This research sought to measure the contribution of litter input and carbon storage provided by Agroforestry Systems (SAFs) with shaded coffee plantations, located in an Altitude Brejo in Pernambuco, in the state of Pernambuco. , plays a crucial role in maintaining soil fertility due to its influence on nutrient cycling. SAFs have proven to be effective in capturing carbon, acting as CO2 sinks and contributing to the mitigation of climate change. The objectives of this study were: to quantify the litter input and above-ground carbon content in SAFs and to evaluate microbial activity in this land use system. The research highlights the importance of SAFs in carbon sequestration and promoting microbial biodiversity, which favors environmental sustainability and agricultural production. Litter production showed temporal variations, with an input of this material being observed in the Secondary Native Forest (MNS) (858.06 kg/ha/month) compared to the SAF (807.11 kg/ha/month). Regarding the percentage of fractions that make up the litter (leaves, branches, reproductive structures), the leaf fraction was predominant in both systems, constituting around 79% in the SAF and 68% in the MNS of the litter contributed up the soil. The increase in litterfall in MNS followed precipitation, while this trend was not observed in SAF. The results are in line with the literature on the topic, highlighting the contribution of plant species to the deposition of organic matter. In the SAF, the stock of live biomass above ground was 330 t/ha, corresponding to 155.1 t/ha of carbon, values higher than those recorded in the MNS (67 t/ha of biomass and 31 t/ha of carbon) . The greater biomass and carbon stock in the SAFs reflect the development of the arboreal component and the diversity of plant species, favoring the sequestration and storage of atmospheric carbon. Pearson's correlation analysis indicated a strong positive relationship between biomass and carbon (r = 0.997). SAF showed higher microbial density compared to MNS, especially fungi. During the dry period, fungi in the SAF reached an average of 10.0 × 10⁵ CFU/g, while during the rainy period there was a significant reduction due to leaching. Fungi identified included Aspergillus, Penicillium, Simplicillium and Trichoderma. The high microbial population in the two land use systems (SUS) occurs due to the maintenance of favorable soil conditions, proven by the positive correlation between the number of CFU and soil pH and moisture. The results highlight the relevance of SAFs as conservation models, promoting greater soil productivity, carbon storage and microbial biodiversity compared to MNS. These systems stand out as important tools for environmental conservation, associated with agricultural production and environmental preservation.

COMMITTEE MEMBERS:
Interno - ALEX SOUZA MORAES
Externo ao Programa - 6383609 - MOACYR CUNHA FILHO - nullPresidente - VICTOR CASIMIRO PISCOYA