@article{fdi:010014889,
  title = {{P}-isotopic exchange values in relation to {P}o mineralisation in soils with very low {P}-sorbing capacities},
  author = {{L}opez-{H}ernandez, {D}. and {B}rossard, {M}ichel and {F}rossard, {E}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he productivity of many agricultural systems is determined by the quantity of inorganic {P} ({P}i) made available through mineralisation of organic {P} ({P}o) during the growing season. {B}ecause of the adsortive nature of the soil mineral fraction, any recently-mineralised {P}o may be rapidly partitioned to the solid phase. {A}ttempts to quantify {P}o mineralisation, have been unsuccessful due to the difficulties in separating recently-released {P}i from labile {P}i forms already existing in the soil. {W}e have investigated the use of an isotopic dilution technique to measure the increase of isotopically-exchangeable {P} with time ({E}(t)) in : a short-term experiment (1-100 min) where there was only the physico-chemical process of exchange of solution 32{P} with 31{P} located on the solid phase ; and an incubation experiment (0-51 d) where there were both physico-chemical and biological (immobilisation and mineralisation) processes. {A}lthough the {E}(t) values were obtained by different means (water- and resin-{P}i extractions), the marked difference between both values during the 51 d experiment could not be completely explained by 32{P} exchange with 31{P} in the solid phase. {T}he strong association between {E}(t) increment with {P}o and {CO}2 respiration values during incubation suggest biological participation. {E}stimates of {P}o mineralisation and {CO}2 respiration values during incubation suggest biological participation. {E}stimates of {P}o mineralisation rates for the low {P}-sorbing soils (220-900 microg {P}/kg/d) were similar to values in the literature that were obtained by isotopic and non-isotopic methods. ({R}{\'e}sum{\'e} d'auteur)},
  keywords = {{FERTILITE} {DU} {SOL} ; {PHOSPHORE} {ORGANIQUE} ; {MINERALISATION} ; {MESURE} ; {ISOTOPE}},
  booktitle = {},
  journal = {{S}oil {B}iology and {B}iochemistry},
  volume = {30},
  numero = {13},
  pages = {1663--1670},
  ISSN = {0038-0717},
  year = {1998},
  DOI = {10.1016/{S}0038-0717(97)00255-1},
  URL = {https://www.documentation.ird.fr/hor/fdi:010014889},
}