@article{fdi:010049227,
  title = {{S}patial patterns of {P} fractions and chemical properties in soils of two native shrub communities in {S}enegal},
  author = {{D}ossa, {E}. {L}. and {D}iedhiou, {S}. and {C}ompton, {J}. {E}. and {A}ssigbets{\'e}, {K}omi and {D}ick, {R}. {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}wo shrub species ({P}iliostigma reticulatum ({D}.{C}.) {H}ochst ({C}aesalpinioideae) and {G}uiera senegalensis {J}.{F}. {G}mel ({C}ombretaceae) are commonly found in farmers' fields at varying densities in semi-arid {S}enegal and throughout the {S}ahel where soils have chronically low phosphorus ({P}) availability. {I}t seems plausible that shrub litter and the rhizospheres could influence {P} fractions and other chemical soil properties that affect crop productivity. {T}hus, a study was done at two sites, on the distribution of inorganic and organic soil {P} pools, organic {C} levels, and p{H} in soil beneath and outside the canopies of {P}. reticulatum and {G}. senegalensis (0-30 cm depth). {B}oth sites had low total {P} ranging from 64 mg {P} kg(-1) to 135 mg {P} kg(-1), and low extractable {PO}4 (resin {P}i) (1-6 mg {P} kg(-1)) with {P} fractions dominated by {N}a{OH}-{P}. {O}rganic {P} ({P}o) made up about 50% of total {P}, and most of the organic {P} (> 60%) was found in the {N}a{OH}-{P} fractions. {T}he labile {P}, particularly bicarb-{P}o was higher in soil beneath shrub canopies (8.4 mg {P} kg (-1)), than outside the canopy (6.2 mg {P} kg (-1)). {S}imilarly, {C}, {N} and {P} to a lesser extent, were more concentrated beneath shrub canopies. {P}. reticulatum soil was dominated by the {N}a{OH}-{P}o fraction, whereas {G}. senegalensis had higher bicarb-{P}o at one of the study sites. {A}n index of biologically available organic {P} ({B}icarb-{P}o) / ({B}icarb-{P}o + {B}icar-{P}i + {R}esin {P}i) was > 60% and indicates that biological processes represent an important part of {P} cycling in these shrub ecosystems. {T}he differential ability of shrubs in modifying soil chemical properties under their canopies has major implications for biogeochemical cycling of nutrients and {C} in sandy soils of semi arid {S}ahelian ecosystems.},
  keywords = {{C}anopy soil ; {P} fractions ; {S}ahel ; {S}emi-arid ; {S}hrubs ; {T}otal {C}},
  booktitle = {},
  journal = {{P}lant and {S}oil},
  volume = {327},
  numero = {1-2},
  pages = {185--198},
  ISSN = {0032-079{X}},
  year = {2010},
  DOI = {10.1007/s11104-009-0044-8},
  URL = {https://www.documentation.ird.fr/hor/fdi:010049227},
}