@article{fdi:010068719,
  title = {{E}stimating temporal changes in soil carbon stocks at ecoregional scale in {M}adagascar using remote-sensing},
  author = {{G}rinand, {C}lovis and {L}e {M}aire, {G}. and {V}ieilledent, {G}. and {R}azakarnanarivo, {H}. and {R}azafimbelo, {T}. and {B}ernoux, {M}artial},
  editor = {},
  language = {{ENG}},
  abstract = {{S}oil organic carbon ({SOC}) plays an important role in climate change regulation notably through release of {CO}2 following land use change such a deforestation, but data on stock change levels are lacking. {T}his study aims to empirically assess {SOC} stocks change between 1991 and 2011 at the landscape scale using easy to-access spatially-explicit environmental factors. {T}he study area was located in southeast {M}adagascar, in a region that exhibits very high rate of deforestation and which is characterized by both humid and dry climates. {W}e estimated {SOC} stock on 0.1 ha plots for 95 different locations in a 43,000 ha reference area covering both dry and humid conditions and representing different land cover including natural forest, cropland, pasture and fallows. {W}e used the {R}andom {F}orest algorithm to find out the environmental factors explaining the spatial distribution of {SOC}. {W}e then predicted {SOC} stocks for two soil layers at 30 cm and 100 cm over a wider area of 395,000 ha. {B}y changing the soil and vegetation indices derived from remote sensing images we were able to produce {SOC} maps for 1991 and 2011. {T}hose estimates and their related uncertainties where combined in a post-processing step to map estimates of significant {SOC} variations and we finally compared the {SOC} change map with published deforestation maps. {R}esults show that the geologic variables, precipitation, temperature, and soil-vegetation status were strong predictors of {SOC} distribution at regional scale. {W}e estimated an average net loss of 10.7% and 5.2% for the 30 cm and the 100 cm layers respectively for deforested areas in the humid area. {O}ur results also suggest that these losses occur within the first five years following deforestation. {N}o significant variations were observed for the dry region. {T}his study provides new solutions and knowledge for a better integration of soil threats and opportunities in land management policies.},
  keywords = {{S}oil organic carbon ; {S}pectroscopy ; {PLSR} ; {R}andom forest ; {S}oil-landscape factors ; {C}hange detection ; {D}eforestation ; {MADAGASCAR}},
  booktitle = {},
  journal = {{I}nternational {J}ournal of {A}pplied {E}arth {O}bservation and {G}eoinformation},
  volume = {54},
  numero = {},
  pages = {1--14},
  ISSN = {0303-2434},
  year = {2017},
  DOI = {10.1016/j.jag.2016.09.002},
  URL = {https://www.documentation.ird.fr/hor/fdi:010068719},
}