@article{fdi:010084942,
  title = {{S}lope position and biochar influence soil properties and seed displacement in a tropical agroecosystem},
  author = {{J}aneau, {J}ean-{L}ouis and {I}ntanon, {S}. and {P}ansak, {W}. and {R}odprai, {C}. and {A}nusorn, {K}. and {H}ammecker, {C}laude and {G}rellier, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}oil erosion due to land use change is a major concern in agricultural areas. {T}here is an urgent need to develop appropriate agricultural practices that promote higher biodiversity and improve soil properties. {L}ittle is known about the processes of natural vegetation recovery after disturbance by human activities in tropical humid climates. {T}his is particularly the case for dispersion by water (hydrochory) that affects seeds. {T}he displacement of native plant seeds on the soil surface by runoff may be influenced by soil properties and by the use of biochar in agriculture. {A}s these effects have not been documented in tropical agroecosystems and on steep slopes, we present here an in-field experiment on a steeply sloping maize field affected by rainfall and tillage erosion in {N}orthern {T}hailand. {O}ur objectives were to test the effect of catena position and biochar use on seed displacement, soil loss and nutrient losses. {W}e used 24 plots of 1 m2 located at four positions in the catena. {T}wo treatments were tested: (1) conventional system with tillage and (2) biochar incorporated into the soil. {W}e measured the displacement of plastic beads (to imitate round seeds), runoff volume, soil and nutrient losses and soil surface features during in-situ rainfall simulations. {A}fter two simulated rainfall events and four natural rainfall events, total bead exportation was 7.2%. {W}e found that catena position and biochar had an impact on runoff, soil and nutrient losses. {I}n this study, previously incorporated biochar reappeared at the soil surface after 8 months under natural conditions and acted like a crust at the soil surface. {T}his biochar crust increased runoff, increased potassium concentration and decreased phosphorus concentration in runoff, decreased bead displacement and had no effect on soil loss. {T}his study, under tropical climate and steep slope conditions, highlights differences in soil surface features and runoff along the catena. {W}e should consider catena position for improving soil management and using appropriate agroecological practices. {H}ighlights : - {T}he effect of catena position and biochar use on seed displacement, soil loss and nutrient losses were tested. - {T}hese effects have not been documented in tropical agroecosystems and steep slopes. - {C}atena position and biochar use had an impact on runoff, soil and nutrient losses. - {C}atena position for improving soil management and using agroecological practices should be considered.},
  keywords = {{THAILANDE} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{E}uropean {J}ournal of {S}oil {S}cience},
  volume = {73},
  numero = {2},
  pages = {e13216 [20 ]},
  ISSN = {1351-0754},
  year = {2022},
  DOI = {10.1111/ejss.13216},
  URL = {https://www.documentation.ird.fr/hor/fdi:010084942},
}