Banca de DEFESA: FERNANDA LAMIN HENRIQUE

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : FERNANDA LAMIN HENRIQUE
DATE: 18/02/2020
TIME: 13:30
LOCAL: Laboratório Didático I
TITLE:

Spatiotemporal patterns of vegetation productivity in Caatinga drylands

KEY WORDS:

geoprocessing  ; vegetation index  ; ecosystem stability ;Caatinga ;semiarid ecossystems; landscape

PAGES: 40
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

Ecosystem patterns of vegetation are well related to climatic factors in seasonal environments. Rainfall is a limiting resource in arid environments, but there is evidence that in the absence of precipitation, geographic aspects such as land and climate factors as water balance, contribute to the stabilization of primary productivity. Using geoprocessed data, we tested the influence of altitude, water deficit and type of vegetation (forest formation, countryside formation and savanna formation) on primary productivity and on the stability of this ecosystem function in the Caatinga domain. We expect that altitude will positively influence both primary productivity and stability, while the water deficit will have a negative effect. We believe that forest regions depend more on the increase in elevation, while the herbaceous-shrub physiognomies are more strongly controlled by the water deficit. We map the Caatinga in greater and lesser productivity and stability, based on the division by the median, and, we modeled the temporal structure of these changes seasonally, through a cross correlation function, to verify how stable the Caatinga is. The influence of altitude and water deficit on primary productivity differ individually according to the type of vegetation. Still, we found a variation between different types of vegetation, the effect on stability, when altitude and water deficit interact with each other. The water deficit negatively affects primary productivity and stability, and appears to have a greater influence than altitude, which acts with a positive effect. The most productive and stable areas, which in the long term, make up 37.5% of the Caatinga, declines to 10% in October, on a seasonal scale. The strongest change happens almost instantly due to the decrease in places with higher productivity due to drought, showing that few areas remain stable in the most critical periods. Understanding which processes influence the patterns described are important in terms of conservation, to predict the places that may suffer the most from the changes that the Caatinga have faced in changing land use and climate

BANKING MEMBERS:
Interno - 1678202 - CARLOS ROBERTO SORENSEN DUTRA DA FONSECA
Presidente - 1718346 - EDUARDO MARTINS VENTICINQUE
Externo à Instituição - THIAGO SANNA FREIRE SILVA - UNESP