@article{fdi:010040874,
  title = {{A}ssessing the variability of soil surface characteristics in row-cropped fields : {T}he case of {M}editerranean vineyards in {S}outhern {F}rance},
  author = {{C}orbane, {C}hristina and {A}ndrieux, {P}. and {V}oltz, {M}. and {C}hadaeuf, {J}. and {A}lbergel, {J}ean and {R}obbez {M}asson, {J}. {M}. and {Z}ante, {P}atrick},
  editor = {},
  language = {{ENG}},
  abstract = {{S}patial patterns of soil surface characteristics ({SSC}) are important factors for heterogeneity in runoff and infiltration processes in row-cropped fields. {T}he objective of this paper is to analyse the spatial heterogeneity of {SSC} in the case of a vineyard in order to propose an adequate sampling strategy. {A} preliminary field survey was carried out to obtain a quantitative assessment of {SSC}. {T}he experimental layout consisted of 3 wire-trained vine subplots with 3 different soil treatment. 60 observations per subplot were conducted using the line transect method. {T}heir locations were determined according to a stratified sampling design conceived in accordance with the geometric structure of the vineyard system, defined by the alignment of vine rows and the direction of the main slope. {T}he spatial heterogeneity of {SSC} was analysed at intra-transect and inter-transect levels using measurements of structural crust, sedimentary crust, grass and organic litter. {T}he characterization of intra-transect heterogeneity, using join-count statistics, allowed patches of homogeneous units of attributes to be detected and hence an appropriate sampling resolution and an adequate transect length to be determined. {A} sampling resolution of 10 cm on a 1.25 m length transect was found to be appropriate for the observation of homogeneous units of attributes. {A}nalysis of inter-transect heterogeneity, using non-spatial statistics, revealed considerable variability between rows and inter-rows that must be accounted for during field surveys. {T}he role of site topography on spatial patterning of {SSC} attributes across the plot and the need to stratify the plot into areas with homogeneous slope were also demonstrated. {F}inally, the t-test procedure indicated that the minimum sample size was found to be 200 transect/ha for a minimum precision rate of 80% in the values of {SSC} attributes. {T}he proposed sampling protocol is described as a step-by-step procedure and could be applied in sampling designs relevant to {SSC} monitoring in row-cropped fields.},
  keywords = {soil surface characteristics ; spatial variability ; sampling design ; vineyard ; {M}editerranean climate},
  booktitle = {},
  journal = {{C}atena},
  volume = {72},
  numero = {1},
  pages = {79--90},
  ISSN = {0341-8162},
  year = {2008},
  DOI = {10.1016/j.catena.2007.04.006},
  URL = {https://www.documentation.ird.fr/hor/fdi:010040874},
}