Tesis
Possíveis destinos do carbono da serrapilheira no ecótono Cerrado-Pantanal
Fecha
2017-07-12Registro en:
MARTINS, André Luiz. Possíveis destinos do carbono da serrapilheira no ecótono Cerrado-Pantanal. 2017. 99 f. Tese (Doutorado em Física Ambiental) - Universidade Federal de Mato Grosso, Instituto de Física, Cuiabá, 2017.
Autor
Lobo, Francisco de Almeida
Ortíz, Carmen Eugenia Rodríguez
http://lattes.cnpq.br/2783222284467182
http://lattes.cnpq.br/0296723198831816
Lobo, Francisco de Almeida
346.659.001-91
http://lattes.cnpq.br/0296723198831816
Ortíz, Carmen Eugenia Rodríguez
830.350.526-20
http://lattes.cnpq.br/2783222284467182
346.659.001-91
830.350.526-20
Rodrigues, Thiago Rangel
725.880.391-20
http://lattes.cnpq.br/7044858666359931
Lucena, Isabela Codolo de
000.972.041-37
http://lattes.cnpq.br/8039678256614548
Valentini, Carla Maria Abido
432.459.271-34
http://lattes.cnpq.br/6189350328079584
Institución
Resumen
Considering the current situation in the world, where the concern with the
anthropic greenhouse effect is determinant of the public policies of the
development of the nations, the understanding of the natural processes that affect
the biogeochemical carbon cycle is absolutely indispensable. As the
phytophysiognomies of the Cerrado of Baixada Cuiabana show great variability in
the accumulation of litter on the soil, this accumulation reveals and quantifies how
much CO2 can be released in an eventual fire on the surface. Therefore, the
transect of Campo Sujo produces a cumulative of carbon in average 1,3 Mg.ha1
.year
-1 and can release around 5 Mg.ha-1
.year
-1 of CO2. In this sense,
the objective of the present work was to evaluate the dynamics of the production,
accumulation and decomposition of the litter associated to its contribution with
the organic matter of the soil and to the risk of burning it in an area of ecotone,
area of Between the Cerrado-Pantanal. Five transects with distinct
phytophysiognomies were analyzed: The Campo Sujo, the Cerrado Stricto Sensu,
the Cambarazal, the Cerradão and a Cerrado Miscelanea. The litter produced in
the transects evaluated presented a significant increase in the dry period, varying
from 0,22 Mg.ha-1.month-1 in the Campo Sujo to 0,88 Mg.ha-1.month-1 in the
Cerrado Stricto Sensu. Like wise, the accumulated litter presented a significant
increase in the arid period, ranged from 5,74 Mg.ha
-1.month-1 in the Campo Sujo
to 14,42 Mg.ha-1.month-1 in Cambarazal. The estimated annual carbon production
from litter ranged from 0,9 Mg.ha-1
.year
-1 in the Campo Sujo and 4,3 Mg.ha1
.year
-1 in the Cerrado Stricto Sensu. Like wise, the estimated annual nitrogen
production from the litter varied from 0,02 Mg.ha-1
.year
-1 in the Campo Sujo and
0,12 Mg.ha-1
.year
-1 in Cerradão, confirming the hypothesis that in the Baixada
Cuiabana accumulated litter contributes to the increased risk of fires. It was
observed with the Monte Alegre Formula that over 86% of the evaluated days are
between the medium, high and very high degrees of danger. The estimates of the
Monte Alegre Formula in the region characterize the location with fire risk during
313 days of the year. Some situations in the transects evaluated favored the
combustibility of the plant material deposited on the soil. High litter levels were
observed on the soil, and fire probability indexes with high and extreme ranks
were practically every month of the year. Likewise, the moisture content of litter
accumulated on the soil presented values lower than Moisture content in plant
material, and the on-site dryness index corroborates the understanding of
increased combustibility in the dry season.