In North Thailand land use/-cover change quickly especially in steep agrosystem land. Under rainf... more In North Thailand land use/-cover change quickly especially in steep agrosystem land. Under rainfall simulation, we are looking at the effect of the topographic situation along the slope and catena using 24 microplots of 1m2 each located down, middle, up and top of the slope. We quantified seed dispersion, soil detachment, soil losses and runoff processes for two soil treatment: tradition cropping and with biochar amendments.
Soil erosion due to land use change and consequently biodiversity loss are major concerns in agri... more Soil erosion due to land use change and consequently biodiversity loss are major concerns in agricultural areas. However, the link between runoff, soil loss and plant dispersion by water also called hydrochory is not yet well understood, especially in tropical climate. The displacement of native plant seeds on the soil surface by runoff may be influenced by soil properties and by agricultural practices. This may in return affect or modify biodiversity in agroecosystems.This is why we propose to study the processes affecting seed displacement by runoff in steeply sloping maize field affected by rainfall and tillage erosion in Northern Thailand.After a first study under rainfall simulation in situ (Janeau et al. 2022), we present here a two years study under natural rainfall to assess the role of position in the catena and soil properties on seed displacement, soil loss and nutrient losses. We used 24 plots of 1 m2 located at four positions in the catena. Two treatments were tested: (...
Despite the large contribution of macropores made by soil engineers to the soil macroporosity and... more Despite the large contribution of macropores made by soil engineers to the soil macroporosity and water infiltration, few studies have addressed the specific contribution of soil engineer groups, dynamics of biopores and their efficiency in conducting water. Thus, we aimed to investigate the link between soil macrofauna, soil biopores and water infiltration under different pedoclimatic conditions. To do so, we conducted an experimentation in twelve study sites with a large longitudinal gradient from France to Vietnam. The experiment consisted in the field incubation of repacked soil in cores (15 cm in height and 15 cm in diameter) and controlling the activity of soil engineers in the manner of litter bag. For each site, soil columns were: (i) covered with a mesh (200µm) or not and (ii) with or without addition of organic residues to the soil surface. After 12 months, we measured (i) the 3D organization of biopores by X-ray computed tomography and (ii) the saturated hydraulic conduc...
In North Thailand land use/-cover change quickly especially in steep agrosystem land. Under rainf... more In North Thailand land use/-cover change quickly especially in steep agrosystem land. Under rainfall simulation, we are looking at the effect of the topographic situation along the slope and catena using 24 microplots of 1m2 each located down, middle, up and top of the slope. We quantified seed dispersion, soil detachment, soil losses and runoff processes for two soil treatment: tradition cropping and with biochar amendments.
Soil erosion due to land use change and consequently biodiversity loss are major concerns in agri... more Soil erosion due to land use change and consequently biodiversity loss are major concerns in agricultural areas. However, the link between runoff, soil loss and plant dispersion by water also called hydrochory is not yet well understood, especially in tropical climate. The displacement of native plant seeds on the soil surface by runoff may be influenced by soil properties and by agricultural practices. This may in return affect or modify biodiversity in agroecosystems.This is why we propose to study the processes affecting seed displacement by runoff in steeply sloping maize field affected by rainfall and tillage erosion in Northern Thailand.After a first study under rainfall simulation in situ (Janeau et al. 2022), we present here a two years study under natural rainfall to assess the role of position in the catena and soil properties on seed displacement, soil loss and nutrient losses. We used 24 plots of 1 m2 located at four positions in the catena. Two treatments were tested: (...
Despite the large contribution of macropores made by soil engineers to the soil macroporosity and... more Despite the large contribution of macropores made by soil engineers to the soil macroporosity and water infiltration, few studies have addressed the specific contribution of soil engineer groups, dynamics of biopores and their efficiency in conducting water. Thus, we aimed to investigate the link between soil macrofauna, soil biopores and water infiltration under different pedoclimatic conditions. To do so, we conducted an experimentation in twelve study sites with a large longitudinal gradient from France to Vietnam. The experiment consisted in the field incubation of repacked soil in cores (15 cm in height and 15 cm in diameter) and controlling the activity of soil engineers in the manner of litter bag. For each site, soil columns were: (i) covered with a mesh (200µm) or not and (ii) with or without addition of organic residues to the soil surface. After 12 months, we measured (i) the 3D organization of biopores by X-ray computed tomography and (ii) the saturated hydraulic conduc...
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Papers by Claude Hammecker