Banca de DEFESA: HELLEN KEZIA SILVA ALMADA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : HELLEN KEZIA SILVA ALMADA
DATA : 31/05/2022
HORA: 15:00
LOCAL: Plataforma Zoom
TÍTULO:

IMPLICATIONS OF DEFORESTATION IN THE CERRADO-AMAZON TRANSITION FOR CLIMATE REGULATION AND WATER AVAILABILITY

PALAVRAS-CHAVES:

remote sensing, tropical ecosystems, water security

PÁGINAS: 80
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
SUBÁREA: Ecologia de Ecossistemas
RESUMO:

One of the great challenges of ecosystem ecology today is to understand how climate change and changes in land use and cover affect or have the potential to affect the services provided by native ecosystems, such as climate regulation and water availability, and to understand what are the effects of these changes on the environmental and economic sustainability of urban and rural communities. In this context, Brazilian Conservation Units (CUs) and Indigenous Lands (ILs) have been particularly effective as barriers to deforestation and in providing ecosystem services, including climate regulation. However, deforestation in private areas outside UCs and TIs, known as multiple-use zones (MUs), often adds external pressure that increases disturbance within protected areas. Here, we use recent satellite-based data (2001-2020) to assess how surface temperature [LST], evapotranspiration [ET] and albedo – three key processes for climate regulation – have changed with land use (CUs, ILs, and MUs) and biomes (Amazon, Cerrado) in the Brazilian state of Mato Grosso. We also evaluated the temporal effects of changes in land use and cover on water flow and availability, in microbasins with steep relief and different levels of native vegetation cover, located in the transition between the Cerrado and Amazon biomes. Our results confirm that, despite multiple stressors, protected areas still play an important role in stabilizing the regional climate, maintaining a higher ET flux, lower LST and lower albedo relative to other land uses. We also showed in this study that the annual and daily flows in steep watersheds depend directly on the percentage of native vegetation, since these flows are always higher in watersheds with higher conversion rates of native vegetation. We found even greater seasonality in the flow of watersheds with the highest percentage of converted area, where storm peaks were always higher and the base flow in the dry season was lower. Our study indicated that deforestation in steep watersheds can compromise water availability in the region, since the replacement of native vegetation promotes peaks in water flow during the rainy season and water shortages during the dry season.

MEMBROS DA BANCA:
Presidente - 132029001 - EDDIE LENZA DE OLIVEIRA
Interno - 068.877.126-28 - DILERMANDO PEREIRA LIMA JUNIOR - UEM
Interno - 220.974.038-08 - PAULO MONTEIRO BRANDO - NENHUMA
Externo à Instituição - CHRISTOPHER NEILL - IPAM
Externo à Instituição - LIANA OIGHENSTEIN ANDERSON - Oxford