@article{fdi:010066755,
  title = {{O}vergrazing decreases soil organic carbon stocks the most under dry climates and low soil p{H} : a meta-analysis shows},
  author = {{D}lamini, {P}. and {C}hivenge, {P}. and {C}haplot, {V}incent},
  editor = {},
  language = {{ENG}},
  abstract = {{G}rasslands occupy about 40% of the world's land surface and store approximately 10% of the global soil organic carbon ({SOC}) stock. {T}his {SOC} pool, in which a larger proportion is held in the topsoil (0-0.3 in), is strongly influenced by grassland management. {D}espite this, it is not yet fully understood how grassland {SOC} stocks respond to degradation, particularly for the different environmental conditions found globally. {T}he objective of this review was to elucidate the impact of grassland degradation on changes in {SOC} stocks and the main environmental controls, worldwide, as a prerequisite for rehabilitation. {A} comprehensive meta-analysis was conducted using 55 studies with 628 soil profiles under temperate, humid, sub-humid, tropical and semi-arid conditions, to compare {SOC} stocks in the topsoil of non degraded and degraded grassland soils. {G}rassland degradation significantly reduced {SOC} stocks by 16% in dry climates (<600 mm) compared to 8% in wet climates (>1000 mm) and {A}sia was the most affected continent (-23.7%). {M}oreover, the depletion of {SOC} stock induced by degradation was more pronounced in sandy (<20% clay) soils with a high {SOC} depletion of 10% compared to 1% in clayey (>= 32% clay) soils. {F}urthermore, grassland degradation significantly reduced {SOC} by 14% in acidic soils (p{H} <= 5), while {SOC} changes were negligible for higher p{H}. {A}ssuming that 30% of grasslands worldwide are degraded, the amount of {SOC} likely to be lost would be 4.05 {G}t {C}, with a 95% confidence between 1.8 and 6.3 {G}t {C} (i.e. from 1.2 to 4.2% of the whole grassland soil stock). {T}hese results by pointing to greater {SOC} losses from grasslands under dry climates and sandy acidic soils allow identification of grassland soils for which {SOC} stocks are the most vulnerable, while also informing on rehabilitation measures.},
  keywords = {{SOC} stocks ; {S}patial variation ; {C}ontrolling factors ; {G}rasslands ; {G}rassland degradation ; {ZONE} {TEMPEREE} ; {ZONE} {SEMIARIDE} ; {ZONE} {SUBTROPICALE}},
  booktitle = {},
  journal = {{A}griculture {E}cosystems and {E}nvironment},
  volume = {221},
  numero = {},
  pages = {258--269},
  ISSN = {0167-8809},
  year = {2016},
  DOI = {10.1016/j.agee.2016.01.026},
  URL = {https://www.documentation.ird.fr/hor/fdi:010066755},
}