@article{fdi:010042703,
  title = {{L}and-use impacts on surface runoff and soil detachment within agricultural sloping lands in {N}orthern {V}ietnam},
  author = {{P}odwojewski, {P}ascal and {O}range, {D}idier and {J}ouquet, {P}ascal and {V}alentin, {C}hristian and {N}guyen, {V}. {T}. and {J}aneau, {J}ean-{L}ouis and {T}ran, {D}. {T}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}wo consecutive years of investigation on soil surface features, surface runoff and soil detachment within 1-m(2) microplots on 40% slope highlighted the effects of land-use change, vegetation cover and biological activity on the water pathways in {N}orthern {V}ietnam. {T}hree replicate plots were setup on each of five land-uses: cassava ({CAS}), grass fodder of {B}racharia ruziziensis ({BRA}), a 3-year old fallow ({FAL}), tree stands of {A}cacia mangium and {V}enicia montana ({FOR}), and a fallow with regrowth of {E}ucalyptus regularly cut ({EUC}). {T}he second year, two of the microplots under {FAL} and {EUC} were treated with herbicide ({FAL}h, {EUC}h), one of them was burnt ({FAL}h+b, {EUC}h+b). {T}he highest yearly surface runoff coefficient of 16%, and soil detachment rate of 700 g m(-2) yr(-1) in average with a maximum of 1305 g m(-2) yr(-1) have been recorded under {CAS}. {O}n {FAL}h and {FAL}h+b, runoff ratios were 8.7 and 13.5%, respectively and detachment rates were 86 and 389 g m(-2). {O}n {FAL} and {BRA} the yearly runoff ratio varied from 5.9 to 9.8% but the detachment rate was limited at 24 to 35 g m(-2). {FOR} and {EUC} annual runoff was <= 3.1% and annual soil detachment <= 71 g m(-2). {T}hese values were very low compared to the values reported on steep slopes in {L}aos within similar climate and vegetation cover. {T}he runoff and detachment rates underlined the importance of rainfall intensities, soil physical properties, soil surface features, soil vegetation cover and biological activity. {T}he annual surface runoff was highly correlated to the soil surface crusting. {CAS} and {BRA} plots were prone to crusting especially after weeding at the onset of the rainy season, when the soil surface was still uncovered. {S}oil bioturbation (earthworm casting activity) was the second factor that explains local variation of surface runoff and soil detachment. {T}he continuous production of earthworms casts on soil surface, especially on {FOR} and {EUC} microplots, induced a marked surface roughness and reduced the surface runoff. {T}he production of casts was very limited in {FAL} and completely absent in {CAS} microplots. {S}o it is evident that our results confirm the deleterious effects of cassava on soil and water conservation.},
  keywords = {{C}assava ; {E}arthworms ; {L}and-use ; {S}loping lands ; {S}oil detachment ; {S}urface runoff ; {V}ietnam},
  booktitle = {},
  journal = {{C}atena},
  volume = {74},
  numero = {2},
  pages = {109--118},
  ISSN = {0341-8162},
  year = {2008},
  DOI = {10.1016/j.catena.2008.03.013},
  URL = {https://www.documentation.ird.fr/hor/fdi:010042703},
}