@Article{NavarreteSitAraPedDuq:2016:CoFoPa,
author = "Navarrete, D. and Sitch, S. and Arag{\~a}o, Luiz Eduardo Oliveira
e Cruz de and Pedroni, L. and Duque, A.",
affiliation = "{University of Exeter} and {University of Exeter} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Carbon Decisions
International} and {Universidad Nacional de Colombia}",
title = "Conversion from forests to pastures in the Colombian Amazon leads
to differences in dead wood dynamics depending on land management
practices",
journal = "Journal of Environmental Management",
year = "2016",
volume = "171",
pages = "42--51",
month = "Apr.",
keywords = "Coarse woody debris, Colombian Amazon, Dead wood carbon pool,
Forest-to-pasture conversion, Grazing intensity, REDD+.",
abstract = "Dead wood, composed of coarse standing and fallen woody debris
(CWD), is an important carbon (C) pool in tropical forests and its
accounting is needed to reduce uncertainties within the strategies
to mitigate climate change by reducing deforestation and forest
degradation (REDD+). To date, information on CWD stocks in
tropical forests is scarce and effects of land-cover conversion
and land management practices on CWD dynamics remain largely
unexplored. Here we present estimates on CWD stocks in primary
forests in the Colombian Amazon and their dynamics along 20 years
of forest-to-pasture conversion in two sub-regions with different
management practices during pasture establishment: high-grazing
intensity (HG) and low-grazing intensity (LG) sub-regions. Two
20-year-old chronosequences describing the forest-to-pasture
conversion were identified in both sub-regions. The line-intersect
and the plot-based methods were used to estimate fallen and
standing CWD stocks, respectively. Total necromass in primary
forests was similar between both sub-regions (35.6 ± 5.8 Mg ha-1
in HG and 37.0 ± 7.4 Mg ha-1 in LG). An increase of ~124% in CWD
stocks followed by a reduction to values close to those at the
intact forests were registered after slash-and-burn practice was
implemented in both sub-regions during the first two years of
forest-to-pasture conversion. Implementation of machinery after
using fire in HG pastures led to a reduction of 82% in CWD stocks
during the second and fifth years of pasture establishment,
compared to a decrease of 41% during the same period in LG where
mechanization is not implemented. Finally, average necromass 20
years after forest-to-pasture conversion decreased to 3.5 ± 1.4 Mg
ha-1 in HG and 9.3 ± 3.5 Mg ha-1 in LG, representing a total
reduction of between 90% and 75% in each sub-region, respectively.
These results highlight the importance of low-grazing intensity
management practices during ranching activities in the Colombian
Amazon to reduce C emissions associated with land-cover change
from forest to pasture.",
doi = "10.1016/j.jenvman.2016.01.037",
url = "http://dx.doi.org/10.1016/j.jenvman.2016.01.037",
issn = "0301-4797",
language = "en",
targetfile = "Navarrete_conversion.pdf",
urlaccessdate = "27 abr. 2024"
}