@article{fdi:010063289,
  title = {{S}oil clay influences {A}cacia encroachment in a {S}outh {A}frican grassland},
  author = {{G}rellier, {S}. and {F}lorsch, {N}. and {J}aneau, {J}ean-{L}ouis and {P}odwojewski, {P}ascal and {C}amerlynck, {C}. and {B}arot, {S}{\'e}bastien and {W}ard, {D}. and {L}orentz, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{B}ecause of technical difficulties in measuring soil properties at a large scale, little is known about the effect of soil properties on the spatial distribution of trees in grasslands. {W}e were interested in the associations of soil properties with the phenomenon of tree encroachment, where trees increase in density at the expense of grasses. {T}he spatial variation of soil properties and especially soil texture may modify the properties of hydraulic conductivity, and the availability of soil water and mineral nutrients, which in turn may affect the spatial distribution of encroaching trees. {T}hrough the development of a geophysical method ({S}lingram) using an electromagnetic device {EM}38 and {B}ayesian inversion, we were able to accurately map soil electrical conductivity ({EC}) of a {L}uvisol in a grassland of {S}outh {A}frica. {EC} measured at the 08 to 2m depth on a 15ha area is a proxy for clay content and was correlated with the spatial distribution of four size classes of the encroaching {A}cacia sieberiana. {T}ree location (all sizes considered) was significantly correlated with {EC}. {T}all acacias (>3m height) were totally absent from patches with {EC} >24m{S}m(-1). {F}or all other size classes from medium trees to seedlings, tree density decreased with increasing {EC}. {T}his suggests that high clay contents at depth associated with high {EC} values may prevent the establishment and/or survival of trees and influence the spatial distribution of {A}.sieberiana. {T}his result also shows that geophysical tools may be useful for demonstrating important ecological processes.},
  keywords = {{PRAIRIE} ; {PATURAGE} ; {ARBUSTE} ; {INVASION} ; {DYNAMIQUE} {DE} {VEGETATION} ; {DISTRIBUTION} {SPATIALE} ; {METHODE} {D}'{ANALYSE} ; {CONDUCTIVITE} {HYDRAULIQUE} ; {ELECTROMAGNETISME} ; {ARGILE} ; {VARIATION} {SAISONNIERE} ; {AFRIQUE} {DU} {SUD} ; {KWAZULU} ; {NATAL} ; {POTSHINI}},
  booktitle = {},
  journal = {{E}cohydrology},
  volume = {7},
  numero = {6},
  pages = {1474--1484},
  ISSN = {1936-0584},
  year = {2014},
  DOI = {10.1002/eco.1472},
  URL = {https://www.documentation.ird.fr/hor/fdi:010063289},
}