Banca de DEFESA: LUAN SOUZA DA FONSECA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : LUAN SOUZA DA FONSECA
DATE: 23/06/2022
TIME: 09:00
LOCAL: Google Meet
TITLE:

PERFORMANCE OF NATIVE SPECIES AND THE COMPOSITION OF PLANTED COMMUNITIES ALONG 5 YEARS OF BRAZILIAN DRYLAND RESTORATION

KEY WORDS:

Restoration; Survival; Species; Dryland; Communities

PAGES: 38
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

In the decade of ecosystem restoration, it becomes necessary to reverse the advance of degradation of natural environments, aiming at sustainable development and ensuring human well-being. To achieve this goal, we must think about the restoration of dryland environments that represent 47% of the land surface, such as the Caatinga, a Brazilian semi-arid ecosystem that covers an area of approximately 912,000km². To scale up restoration projects in this biome, we must understand which species and community compositions can ensure greater success in restoration projects. The aim of this work was to identify species and compositions that show good potential for restoration in the Caatinga. We analysed a five-year period of the first cohort of the BrazilDry experiment located in Açú National Forest (Rio Grande do Norte, Brazil). Using analyses of variance with Tukey's a posteriori test, we tested which species and communities, exhibit: (1) stability in first cohort mortality (species only) and percent survival, (2) mean height, (3) mean annual growth, (4) photosynthesizing biomass production, and (5) diameter above ground (DAS). For the species, all the investigated variables were significant with values of P=>0.001. We found that only one species showed average survival below the stipulated (16%) after five years of planting and more than half show some stability in the cohort. Most species presented height and DAS within the assumed ranges for the work (1 to 2m and 10 to 20mm, respectively), besides presenting, in general, an annual growth between 0m to 0.5m. M. tenuiflora was the highlight in the production of photosynthesizing biomass and DAS, with values exceeding 200g and 30mm, respectively. Regarding plant compositions, only survival and photosynthesizing biomass differed with P=>0.001. Only one composition is not above the 16% survival range. The monoculture of M. tenuiflora differs from all other  compositions in the production of photosynthesizing biomass. The stability in the survival curve of the species presents some stability between 2-4 years due to the technique of root extension. The height and growth show satisfactory results, even with the limitation of their development caused by the dry period, competition with exotic herbaceous species and the capacity for regrowth. The photosynthesizing biomass and DAS are driven by
species diversity, however, in its establishment and growth phase competitive interactions may prevail. This work brings a selection of native species and communities that perform well over 5 years restoration in Caatinga, presenting characteristics that define their potential in the recovery of degraded areas. 

BANKING MEMBERS:
Externo à Instituição - EDSON APARECIDO VIEIRA FILHO
Presidente - 1677189 - GISLENE MARIA DA SILVA GANADE
Externa à Instituição - MILENA CORDEIRO DE AMORIM LOPES