@article{fdi:010018929,
  title = {{T}esting the validity of upslope migration in banded vegetation from {S}outh-{W}est {N}iger},
  author = {{C}happell, {A}. and {V}alentin, {C}hristian and {W}arren, {A}. and {N}oon, {P}. and {C}harlton, {M}. and {D}'{H}erb{\`e}s, {J}ean-{M}arc},
  editor = {},
  language = {{ENG}},
  abstract = {{R}ecent studies of banded vegetation have suggested a successional model, in which bare bands are colonised in a pioneer front on the upslope side of a vegetation band. {V}egetation patterns in {S}outh-{W}est {N}iger have been interpreted to suggest that spatial transitions reflect this form of temporal succession, and in these patterns there is corroborating evidence for slow upslope migration. {H}owever, given the inherent difficulties of long-term field experiments there are few data to judge the validity of this model. {T}he use of the artificial radionuclide caesium-137 (137{C}s) to provide information on net soil flux over the cast ca. 30 years offers potential in this regard. {F}urthermore, the identification of various types of soil crust, which can induce different types of hydrological behaviour, provides valuable information for predicting soil evolution. {T}o test the hypothesis that banded vegetation migrates upslope, a 70-m transect encompassing two vegetation bands and a single bare lane was sampled in {S}outh-{W}est {N}iger. {T}he transect was aligned orthogonal to the bands and approximately parallel to the direction of water, soil and nutrient flow. {S}oil samples for gamma-ray spectrometry and particle-size analysis were collected along the transect at 21 locations with 1-m intervals in the lower part and three samples were obtained on the upper part. {P}rior to collection, the soil surface characteristics were examined to distinguish between crust types and to identify the presence of termite activity. {T}he results demonstrate the utility of these techniques for examining the net redistribution of soil over a period of three decades and its relations to vegetation succession. {T}he amount of soil eroded was found generally to decrease downslope, whilst the proportion of fine silt in the soil generally increased downslope... ({D}'apr{\`e}s r{\'e}sum{\'e} d'auteur)},
  keywords = {{FORMATION} {VEGETALE} ; {DYNAMIQUE} {DE} {VEGETATION} ; {SOL} ; {FLUX} ; {MESURE} ; {RADIOACTIVITE} ; {MODELISATION} ; {ANALYSE} {QUANTITATIVE} ; {BROUSSE} {TIGREE} ; {NIGER} ; {ZONE} {SAHELIENNE} ; {ZONE} {SEMIARIDE} ; {NIAMEY} {REGION}},
  booktitle = {{T}he significance of soil, water and landscape processes in banded vegetation patterning},
  journal = {{C}atena},
  volume = {37},
  numero = {1-2},
  pages = {217--229},
  ISSN = {0341-8162},
  year = {1999},
  DOI = {10.1016/{S}0341-8162(98)00074-5},
  URL = {https://www.documentation.ird.fr/hor/fdi:010018929},
}