@Article{SilveiraEWACMMSTCS:2019:PrMoPl,
author = "Silveira, Eduarda M. O. and Esp{\'{\i}}rito Santos, Fernando D.
and Wulder, Michael A. and Acerbi J{\'u}nior, Fausto W. and
Carvalho, M{\^o}nica C. and Mello, Carlos R. and Mello, Jos{\'e}
M{\'a}rcio and Shimabukuro, Yosio Edemir and Terra, Marcela
Castro Nunes Santos and Carvalho, Luis Marcelo T. and Scolforo,
Jos{\'e} R. S.",
affiliation = "{Universidade Federal de Lavras (UFLA)} and {University of
Leicester} and {Canadian Forest Service (Pacific Forestry Centre)}
and {Universidade Federal de Lavras (UFLA)} and {Universidade
Federal de Lavras (UFLA)} and {Universidade Federal de Lavras
(UFLA)} and {Universidade Federal de Lavras (UFLA)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade Federal
de Lavras (UFLA)} and {Universidade Federal de Lavras (UFLA)} and
{Universidade Federal de Lavras (UFLA)}",
title = "Pre-stratified modelling plus residuals kriging reduces the
uncertainty of aboveground biomass estimation and spatial
distribution in heterogeneous savannas and forest environments",
journal = "Forest Ecology and Management",
year = "2019",
volume = "445",
pages = "96--109",
month = "Aug.",
keywords = "AGB, Random forests, Brazilian biomes, Climate Seasonality.",
abstract = "Mapping aboveground biomass (AGB)is a challenge in heterogeneous
environments, such as the Brazilian savannas and tropical forests
located in Minas Gerais state (MG), Brazil. The factors linked to
AGB stocks vary in climate, soil characteristics, and stand-level
structural attributes over short distances, making generalization
of AGB difficult over regional-scales. We offer the hypothesis
that stratification into vegetation types at the plot level plus a
regression kriging technique, can reduce the variability of
factors controlling AGB, helping to select the appropriate
predictor variables and result in an ability to produce reliable
models and maps. To do so, we incorporate remotely sensed data
(Landsat and MODerate resolution Imaging Spectroradiometer-MODIS),
spatio-environmental variables, and forest inventory data to
develop spatial-explicit maps of AGB across three important
Brazilian biomes (savanna, Atlantic forest, and semi-arid
woodland). We modelled and predicted the spatial distribution of
AGB of six individual vegetation types of savanna-forest biomes
(shrub savanna, woodland savanna, densely wooded savanna,
deciduous forest, semi-deciduous forest and rain forest),
utilizing a random forests (RF)algorithm plus residual kriging,
selecting the lowest number of variables that offer the best
predictive performance. The stratified models notably improved the
AGB prediction by reducing the mean absolute error MAE (%)and the
root-mean-square error RMSE (Mg/ha)for all vegetation types,
mainly for shrub savanna (MAE reduced from 82.69 to 54.73%). The
AGB spatial distribution is governed mainly by precipitation and
seasonality. The south and east of MG presented high values of AGB
due to the predominance of semi-deciduous trees and rain forest
conditions within Atlantic forest biome (total of 491,456,607 Mg),
with a higher amount rain over the year, lower temperatures, and
lower precipitation seasonality. Rain forests have the largest
mean AGB per area (157.71 Mg/ha)while semi-deciduous forests hold
the largest AGB stocks in the state (583,176,472 Mg). Shrub
savannas, located in the central, northwest and north regions of
MG (lower amount of rain, higher temperatures and strong
seasonality), accounted the lowest amount of AGB in both total AGB
(27,906,281 Mg)and AGB per area (18.80 Mg/ha). Our study
demonstrates that stratification can reduce variability and
improve estimates by developing individual models and selecting
optimal predictor variables dependent on the characteristics of
specific vegetation types. The methods demonstrated and the
resultant maps and estimates improve the quality of regional
biomass estimates needed to understand and mitigate climate
change, enabling researchers to refine estimates of greenhouse gas
emissions.",
doi = "10.1016/j.foreco.2019.05.016",
url = "http://dx.doi.org/10.1016/j.foreco.2019.05.016",
issn = "0378-1127",
language = "en",
targetfile = "Silveira1-s2.0-S0378112719301185-main.pdf",
urlaccessdate = "28 abr. 2024"
}