@article{fdi:010037597,
  title = {{S}oil organic matter dynamics along a rice chronosequence in north-eastern {A}rgentina : evidence from natural {C}-13 abundance and particle size fractionation},
  author = {{D}esjardins, {T}hierry and {F}olgarait, {P}.{J}. and {P}ando {B}ahuon, {A}nne and {G}irardin, {C}. and {L}avelle, {P}atrick},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e studied the consequences of rice cultivation and its subsequent abandonment for soil organic matter ({SOM}) dynamics in northeastern {A}rgentina. {T}wo chronosequences, which included a pristine grassland with {C}4 vegetation as a control, and several stages of rice ({C}3) fields abandoned for 1, 2, 4, 6 and 15 years were selected, and soil samples from the first 10 cm were gathered from each plot. {N}atural {C}-13 abundance coupled with particle-size fractionation were employed to characterize {SOM} changes through time discriminated by {SOM} origin. {S}oil samples up to 50 cm were also collected throughout one chronosequence. {M}ost changes in {SOM} occurred on the first 20 cm layer and, bulk density, carbon and nitrogen content, as well as delta {C}-13 remained similar at greater depths. {A}fter the rice cropping, the bulk density was slightly greater than in the natural grassland, and remained stable after the abandonment. {C}arbon and nitrogen contents remained almost stable in the surface layer during the cultivation. delta {C}-13 varied accordingly with the changes in vegetation cover with a {C}4 signature in the natural grassland and mainly a {C}3 signature in the rice fields. {T}he abandonment of the rice cropping induced a decrease of the soil organic matter content, mainly of natural grassland origin, during the first 4 years. {W}hen the abandonment extended, the {SOM} content (from {C}4 origin) increased slowly and after 15 years, was almost the same as that of the natural grassland. {T}he carbon turnover was greater in the coarser fractions than in the finer ones, confirming that soil organic carbon in the sand fraction was relatively labile. {H}owever, all the fractions were affected by inputs and outputs of {C} derived from rice and natural grassland. {T}his fact could indicate that the former protected carbon could become less stable due to cultivation. (c) 2006 {E}lsevier {L}td. {A}ll rights reserved.},
  keywords = {{A}rgentina ; natural grassland ; rice fields ; soil organic matter ; stable carbon isotope ; turnover},
  booktitle = {},
  journal = {{S}oil {B}iology and {B}iochemistry},
  volume = {38},
  numero = {9},
  pages = {2753--2761},
  ISSN = {0038-0717},
  year = {2006},
  DOI = {10.1016/j.soilbio.2006.04.029},
  URL = {https://www.documentation.ird.fr/hor/fdi:010037597},
}