Banca de DEFESA: JULIA ISABELLA DE MATOS RODRIGUES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JULIA ISABELLA DE MATOS RODRIGUES
DATE: 16/02/2024
TIME: 14:00
LOCAL: Auditótio do Instituto de Ciências Agrárias (ICA)
TITLE:

Shifting cultivation and resource management: impacts on a tropical secondary forest

KEY WORDS:

Slash-and-burn; Ecological succession; Natural regeneration; Tropical ecosystems; Forest resilience; Agricultural sustainability.

PAGES: 87
BIG AREA: Ciências Agrárias
AREA: Recursos Florestais e Engenharia Florestal
SUBÁREA: Manejo Florestal
SPECIALTY: Dendrometria e Inventário Florestal
SUMMARY:

The expansion of secondary forests in tropical ecosystems due to post-shifting cultivation abandonment is a reality driven by decreasing productivity resulting from improper management practices. Natural regeneration often plays a key role in restoring these ecosystems, but its effectiveness is limited by various factors, including the degree of degradation, seed sources, and proximity to adjacent forests. The Water and Nutrient Manipulation in Secondary Forests in the Eastern Amazonia (MANFLORA) project was developed over eight years (1999-2007) to understand the factors influencing the dynamics of these ecosystems. The experiment took place in an ecosystem with a 40-year history of shifting cultivation and included irrigation during drier periods and the removal of nutrients through litter. Treatments consisted of irrigation, litter removal, and a control group. Sixteen years after the conclusion of MANFLORA, this dissertation is divided into three chapters aimed at understanding the overall context of shifting cultivation in the Amazonia and the long-term impacts of resource management on secondary forests in the region. In the first chapter, a literature review on shifting cultivation in the Amazonia was conducted, highlighting its importance for rural populations and emphasizing negative impacts such as reduced biota, soil fertility, and aggregation, as well as impacts on flora and fauna. The following two chapters assessed the long-term effects of the MANFLORA experiment. The second chapter examined indicators of vegetation composition and structure, showing differences in floristic composition between treatments but no significant impacts on vegetation structure. The third chapter focused on soil and litter nutrient dynamics, highlighting residual effects on nutrient availability such as K, Ca, Mg, and P. Irrigation positively influenced K availability, while litter removal negatively impacted pH and monthly production of Ca, Mg, and P. These results suggest that resource management can have lasting effects on nutrient dynamics in secondary forests. In summary, the study underscores the importance of shifting cultivation for Amazonian communities but emphasizes the need for sustainable practices to balance food production with forest conservation. The long-term results of MANFLORA provide valuable insights into post-shifting cultivation dynamics, highlighting the influence of water and nutrient manipulations over time. Therefore, this work contributes to understanding the role of these ecosystems and emphasizes the importance of management approaches that consider long-term resilience and sustainability.

BANKING MEMBERS:
Presidente - 388426 - FRANCISCO DE ASSIS OLIVEIRA
Interno - 2411797 - FABIANO EMMERT
Interno - 741.673.590-49 - GUSTAVO SCHWARTZ - EMBRAPA
Externo ao Programa - 1551175 - RODRIGO SILVA DO VALE
Externo à Instituição - LUIZ FERNANDES SILVA DIONISIO - UFRR