Emissão de CO² e atributos físicos em diferentes sistemas de preparo do solo
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Data
2018-02-19
Autores
Simon, Carla da Penha
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Editor
Universidade Federal do Espírito Santo
Resumo
Soil from the agricultural environment can be as a carbon emitter or sink. Soil CO2
emissions (FCO2) depend on the adoption of management practices, such as soil
preparation systems. The objective of this study was to evaluate the influence of
different tillage systems, no-tillage (NT), conventional tillage (CT), minimum tillage
(MT) and native forest area as reference (NF) for FCO2 and relationship with soil
attributes. The study was carried out at the IFES Campus Santa Teresa-ES, between
the months of August / 2016 and March / 2017. To evaluate the FCO2, an infrared gas
analyzer LI-8100A was used, with the simultaneous reading of the temperature and
humidity of the soil; and removal of soil samples close to the installed FCO2 collars, in
the depth range 0 - 0.20 m, in order to determine soil attributes: density (Bd), total pore
volume (TPV), macroporosity (Ma), microporosity (Mi) and mechanical resistance to
soil penetration (RSP). Geostatistical analyzes of semivariograms parameters were
estimated using Geostatistical for environmental science® GS + Software. In the study
areas FCO2 ranged from 0.53 to 4.99 μmol CO2 m-2 s
-1
, the spatial dependence indices
in the NT, CT and MT areas were 95, 50% and 37.9 respectively. The spatial behavior
of the variables in the study presented the classifications of moderate to low spatial
variability. Chapter 2: using univariate statistics, each soil preparation system plus
reference area (NF) were considered as treatments, with 6 replications, totaling 24
experimental units. Where the studied variables were: Bd, TPV, Ma, Mi, RSP and total
organic carbon (TOC). The analyzes were performed using the SisVar® statistical
program. FCO2 presented a significant difference between NT and CT; mean values
for NT, NF, MT and CT (2.30, 2.25, 2.18 and 1.39 μmol CO2 m-2 s
-1
); COT presented
its highest value in the Mata area (32.95 g kg-1
), differing statistically from the other
areas. It was observed that lower emissions can be expected from systems with low
organic carbon input.
Descrição
Palavras-chave
Geoestatistic , Geoestatística , No-tillage , Preparo convencional , Conventional tillage , Cultivo mínimo , Minimum tillage , Sistema de plantio direto , Native forest , Mata nativa
Citação
SIMON, Carla da Penha. Emissão de CO² e atributos físicos em diferentes sistemas de preparo do solo. 2018. 52 f. Dissertação (Mestrado em Agricultura Tropical) - Programa de Pós-Graduação em Agricultura Tropical, Universidade Federal do Espírito Santo, São Mateus, 2018.