@article{fdi:010092780,
  title = {{S}oil erosion control in tree plantations on steep slopes : runoff water and sediment trapping efficiency of riparian grass buffer in mountainous humid tropics},
  author = {{S}ong, {L}. {Y}. and {R}ibolzi, {O}livier and {B}oithias, {L}. and {X}ayyathip, {K}hampaseuth and {V}alentin, {C}hristian and {S}oulileuth, {B}. and {R}obain, {H}enri and {D}e {R}ouw, {A}nneke and {S}ounyafong, {P}. and {S}ilvera, {N}orbert and {S}isouvanh, {P}. and {J}aneau, {J}ean-{L}ouis and {S}aveng, {I}. and {O}eurng, {C}. and {P}ierret, {A}lain},
  editor = {},
  language = {{ENG}},
  abstract = {{R}iparian grass buffers reduce the velocity of water flowing over the soil surface during storms, capturing surface runoff ({SR}) and trapping soil particles eroded from cultivated slopes. {R}arely quantified under steep slope conditions (>45 %), this phenomenon probably occurs in many mountain agroecosystems in the humid tropics. {I}n {S}outheast {A}sia, teak plantations are often established on steep slopes where they can lead to significant soil loss ({SL}), particularly when the understory is removed. {T}herefore, we aimed to: quantify the effect of riparian grass buffers on {SR} and {SL} downstream of a teak plantation; and estimate the trapping efficiency of riparian grass buffers for water ({WTE}) and sediment ({STE}). {F}ield measurements were carried out in {N}orthern {L}ao {PDR} during the2014 rainy season, considering riparian zones with contrasted ground covers: (1) uncovered ({URZ} - 7-year-old teak trees with mean grass and litter densities of 7 % ({SD} 2 %) and 4 % ({SD} 3 %), respectively; (2) transitional ({TRZ} - 7-year-old teak trees with mean grass and litter densities of 19 % ({SD} 10 %) and 56 % ({SD} 9 %), respectively; and (3) covered ({CRZ} - grassed areas without teak trees with mean grass and litter densities of 46 % ({SD} 13 %) and 47 % ({SD} 21 %), respectively). {WTE} and {STE} were estimated based on measurements carried out from 6 {J}uly to 6 {S}eptember2014 under natural rainfall conditions, using pairs of triplicate {G}erlach troughs installed at the upper and lower margins of 5- and 10-m riparian sections (encompassing areas of similar to 25 and 50 m(2), respectively). {R}unoff coefficient ({R}c), {SL}, and soil surface features were measured on the occasion of 20 rainfall events in 1-m(2) microplots. {R}c and {SL} were higher in {URZ} (56 %, 5791 g<middle dot>m(-2)) than in {TRZ} (13 %, 250 g<middle dot>m(-2)) and {CRZ} (19 %, 159 g<middle dot>m(-2)). {M}edian {WTE} and {STE} were the highest along the 10-m {TRZ} + {CRZ} riparian grass buffer at 85 % and 97 % respectively. {P}artial {L}east {S}quare {R}egression ({PLSR}) modelling yielded a good agreement between observation and prediction for {WTE} and {STE} at seasonal scale. {O}verall, the results of this work indicate that 5 to 10 m riparian grass buffers limit the export of surface water and sediment downstream during small (24-h rainfall <= 20.9 mm<middle dot>d(-1), return period <= 1 year) to large storms (40.0 mm<middle dot>d(-1) < 24-h rainfall <= 84.5 mm<middle dot>d(-1), 1.01 year<return period <= 2 years).},
  keywords = {{S}outheast {A}sia ; {T}ropical agroecosystems ; {S}oil loss mitigation ; {N}ature-based solutions ; {E}cosystem services ; {LAOS} ; {ASIE} {DU} {SUD} {EST} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{E}cological {E}ngineering},
  volume = {212},
  numero = {},
  pages = {107537 [14 p.]},
  ISSN = {0925-8574},
  year = {2025},
  DOI = {10.1016/j.ecoleng.2025.107537},
  URL = {https://www.documentation.ird.fr/hor/fdi:010092780},
}