@article{fdi:010064201,
  title = {{D}istribution of organic carbon in different soil fractions in ecosystems of central amazonia},
  author = {{M}arques, {J}. {D}. {D}. and {L}uizao, {F}. {J}. and {T}eixeira, {W}. {G}. and {S}arrazin, {M}ax and {F}erreira, {S}. {J}. {F}. and {B}eldini, {T}. {P}. and {M}arques, {E}. {M}. {D}.},
  editor = {},
  language = {{ENG}},
  abstract = {{O}rganic matter plays an important role in many soil properties, and for that reason it is necessary to identify management systems which maintain or increase its concentrations. {T}he aim of the present study was to determine the quality and quantity of organic {C} in different compartments of the soil fraction in different {A}mazonian ecosystems. {T}he soil organic matter ({FSOM}) was fractionated and soil {C} stocks were estimated in primary forest ({PF}), pasture ({P}), secondary succession ({SS}) and an agroforestry system ({AFS}). {S}amples were collected at the depths 0-5, 5-10, 10-20, 20-40, 40-60, 60-80, 80-100, 100-160, and 160-200 cm. {D}ensimetric and particle size analysis methods were used for {FSOM}, obtaining the following fractions: {FLF} (free light fraction), {IALF} (intra-aggregate light fraction), {F}-sand (sand fraction), {F}-clay (clay fraction) and {F}-silt (silt fraction). {T}he 0-5 cm layer contains 60 % of soil {C}, which is associated with the {FLF}. {T}he {F}-clay was responsible for 70 % of {C} retained in the 0-200 cm depth. {T}here was a 12.7 g kg(-1) {C} gain in the {FLF} from {PF} to {SS}, and a 4.4 g kg(-1) {C} gain from {PF} to {AFS}, showing that {SS} and {AFS} areas recover soil organic {C}, constituting feasible {C}-recovery alternatives for degraded and intensively farmed soils in {A}mazonia. {T}he greatest total stocks of carbon in soil fractions were, in decreasing order: (101.3 {M}g ha(-1) of {C} -{AFS}) > (98.4 {M}g ha(-1) of {C} - {FP}) > (92.9 {M}g ha(-1) of {C} -{SS}) > (64.0 {M}g ha(-1) of {C} - {P}). {T}he forms of land use in the {A}mazon influence {C} distribution in soil fractions, resulting in short- or long-term changes.},
  keywords = {fractionation ; soil organic matter ; land use ; soil physical fractions ; {BRESIL} ; {AMAZONIE}},
  booktitle = {},
  journal = {{R}evista {B}rasileira de {C}iencia do {S}olo},
  volume = {39},
  numero = {1},
  pages = {232--242},
  ISSN = {0100-0683},
  year = {2015},
  DOI = {10.1590/01000683rbcs20150142},
  URL = {https://www.documentation.ird.fr/hor/fdi:010064201},
}