@article{PAR00007932,
  title = {{C}limate and vegetation determine soil organic matter status in an alpine inner-tropical soil catena in the {F}an {S}i {P}an {M}ountain, {V}ietnam},
  author = {{P}odwojewski, {P}ascal and {P}oulenard, {J}. and {N}guyet, {M}. {L}. and {D}e {R}ouw, {A}nneke and {N}guyen, {V}. {T}. and {P}ham, {Q}. {H}. and {T}ran, {D}. {T}.},
  editor = {},
  language = {{ENG}},
  abstract = {{H}igh mountain ecosystems are generally considered to be particularly sensitive to global climate change. {S}tudies of pedogenesis associated with altitudinal variation, vegetation type and soil carbon content on the same type of parent rock are very limited in inter-tropical mountain areas. {T}herefore the altitudinal variation of soil pedogenesis through 9 selected profiles from the altitude of 1340 m to 3143 mast, the summit of the {F}an {S}i {P}an {M}ountain, in the north of {V}ietnam was examined. {F}an {S}i {P}an {M}ountain is composed of a homogenous alkaline granite rock and is the highest point of the {I}nter-tropical {C}ontinental {A}sia. {T}he {S}oil {O}rganic {M}atter properties ({C}, {N}, delta {C}-13 and delta {N}-15 contents) of the different grain-size fractions of the topsoil of 4 selected profiles corresponding to different ecosystems were also examined. {T}hree zones of different soil forming processes were present: {A}crisols and {A}lisols at lower altitudes in sub montane forest, {P}odzols formed in montane and upper montane forest while {U}mbrisols formed at high altitude where the forest vegetation had given way to a shrubby vegetation or a steppe composed of dwarfed bamboo. {W}ith altitude, soils become sandier, have higher concentration of {S}i{O}2 and are lower in {A}l2{O}3. {T}he selective {F}e and {A}l oxalate ({F}e-o and {A}l-o) and pyrophosphate ({F}ew and {A}lp) extracts show a clear discrepancy between {A}crisols or {U}mbrisols with no clear variation with soil depth and {P}odzols with high enrichment in their {B}s horizon. {T}he {SOM} status is highly dependent of the organic matter input by the vegetation. {I}n {A}crisols, the {SOC} is linked to the fine fraction within the soil profile with rapid turnover and low {C}/{N} values. {P}odzols are formed by the accumulation on soil surface of {OM} enriched in the coarse fraction with depleted delta {N}-15 and high {C}/{N} values. {T}he organic matter input is exogenic and probably seasonal from leaves forming the surface litter while in {A}crisols or {U}mbrisols the {SOC} is mainly linked to the fine fraction, and with constant delta {N}-15 values at depth. {I}n {U}mbrisols, the {SOC} origin seems to be linked with endogenic inputs deep in the soil profile mostly produced by the decay of bamboo roots. {I}n this tropical mountainous soil catena, the soil carbon mineralization depends not only on temperature and organo-metallic complexes that stabilize the non labile carbon pool but also is controlled by the pedogenetic process, which is linked with the vegetal ecosystem change with altitude.},
  keywords = {{A}ltitudinal gradient ; {S}oil {O}rganic {M}atter ; {M}ountain soil ; {S}oil genesis ; {P}odzol},
  booktitle = {},
  journal = {{C}atena},
  volume = {87},
  numero = {2},
  pages = {226--239},
  ISSN = {0341-8162},
  year = {2011},
  DOI = {10.1016/j.catena.2011.06.002},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00007932},
}