@article{fdi:010040693,
  title = {{C}omposition and reactivity of morphologically distinct charred materials left after slash-and-burn practices in agricultural tropical soils},
  author = {{R}umpel, {C}. and {G}onzalez {P}erez, {J}. {A}. and {B}ardoux, {G}. and {L}argeau, {C}. and {G}onzalez {V}ila, {F}. {J}. and {V}alentin, {C}hristian},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he composition of black carbon ({BC}) was studied up to now using laboratory experiments, which often fail to reproduce conditions occurring in natural fires. {W}e sampled plant material and two {BC} fractions produced during slash and burn agriculture from two adjacent sites. {A} coarse fraction ({CF}), most probably derived from twigs and stems, was differentiated from lighter, fluffy fine material ({FF}). {T}he samples were analysed for elemental and isotopic composition and their reactivity using acid hydrolysis and acid dichromate oxidation. {T}he chemical composition of the samples was studied by {C}-13 {CPMAS} {NMR} spectroscopy and analytical pyrolysis. {T}he lignin content of the samples was determined after {C}u{O} oxidation. {T}he two {BC} fractions were higher in carbon than the plant material. {O}n an ash-free basis the {CF} and {FF} sampled from the two different sites had remarkably similar elemental contents. {S}table isotope ratios of carbon showed enrichment or depletion depending on the morphological fraction under {C}3 vegetation. {T}he ratios tended to be depleted in {C}-13 with regards to the plant material in both fractions for samples taken under {C}4 vegetation. {T}he reactivity of {BC} towards dichromate oxidation and acid hydrolysis was lower for {CF} compared to {FF}. {C}-13 {CPMAS} {NMR} spectroscopy showed that {BC} fractions were aromatic but could also show substantial contribution from alkyl and {O}-alkyl {C}. {A}nalytical pyrolysis and {C}u{O} oxidation indicated that part of the lignin backbone was remaining in all {BC} fractions. {W}e conclude that the differentiation of {BC} fractions according to morphological criteria was meaningful.},
  keywords = {},
  booktitle = {},
  journal = {{O}rganic {G}eochemistry},
  volume = {38},
  numero = {6},
  pages = {911--920},
  ISSN = {0146-6380},
  year = {2007},
  DOI = {10.1016/j.orggeochem.2006.12.014},
  URL = {https://www.documentation.ird.fr/hor/fdi:010040693},
}