@article{fdi:010075128,
  title = {{V}ariability in soil shrinkage along forest and pasture toposequences in {A}mazonia},
  author = {{Z}enero, {M}. {D}. {O}. and {G}rimaldi, {M}ichel and {C}ooper, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{P}hysically fragile soils are subjected to rapid and abrupt land-use changes in many tropical countries. {I}n this respect, it is important to characterize the changes in soil structure as an essential driver of soil functioning. {S}oil structure and hydric behavior can be analyzed together using soil shrinkage curves ({SSC}). {T}he purpose of this study was to highlight the relevance of {SSC} analysis, even for soils with low shrink-swell capacity, to investigate the influence of three factors of vertical and lateral differentiation in the soil: soil horizon type, topographic position and land use. {W}e analyzed {SSC} variability along two neighboring toposequences, one under forest and the other under pasture, in the southeast of the state of {P}ara in the {B}razilian {A}mazon. {Q}uasi-continuous {SSC} were obtained using a {R}etractometer({C}), and the pedostructure model was adjusted well to experimental data. {D}espite the overall weakness of the shrinkage and the high {SSC} variability, partial {R}edundancy {A}nalysis demonstrated significant ({P} < 0.001) influence of each of the three factors addressed in our study. {T}he influence of soil vertical differentiation was modest, explaining 30% of the total variance in parameters of the pedostructure model. {T}opographic position and land use had a weaker influence on the {SSC}, explaining only 5% and 4%, respectively, of total variance. {T}hese relatively weak influences, in the particular case of our study, were explained by few soil differences along the toposequences (i.e. {U}ltisols from uphill to downhill, extensive pasture management). {H}owever, statistical analysis of hydro-structural variables deduced from the {SSC} revealed significant differences among soil horizons regarding distribution of porosity between plasma and structural pores, and dynamics of these two compartments as a function of soil moisture, which is specific information provided by {SSC} analysis.},
  keywords = {{S}hrinkage curve analysis ; {S}oil structure ; {S}oil porosity ; {S}oil hydro-structural properties ; {S}oil water holding capacities ; {L}and use ; {BRESIL} ; {AMAZONIE} ; {PARA}},
  booktitle = {},
  journal = {{G}eoderma},
  volume = {338},
  numero = {},
  pages = {291--301},
  ISSN = {0016-7061},
  year = {2019},
  DOI = {10.1016/j.geoderma.2018.12.013},
  URL = {https://www.documentation.ird.fr/hor/fdi:010075128},
}