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To investigate the formation of laterites and Fe cycling during tropical weathering, this study presents Fe isotope and major trace-element compositions of a laterite profile obtained from an equatorial rainforest, Southern Philippines. The lateritic profile is 7m deep from top soil to less-weathered peridotites. X-ray diffraction analyses reveal that the major Fe-bearing minerals are hematite and...
We know very little about microbial communities in deeper soil horizons, especially the microbial characteristics along soil depth profiles in paddy fields. In this study, we used a phospholipid fatty acid (PLFA) analysis to investigate the vertical distribution of the microbial community, and to identify the environmental factors that contributed to changes of the microbial community along a soil...
Organic farming and agroforestry both have the potential to develop sustainable and environmental-friendly agroecosystems and to sequester more soil organic C (SOC). In a long-term field trial, we evaluated the effect of 21-year organic farming and 4-year agroforestry (Robinia and Poplar-based alley cropping system) on water extractable organic matter (WEOM). The technique combining excitation emission...
Understanding soil properties under different land use types along toposequences is vital in determining the types of soil management practices that could be implemented by smallholder farmers for improving the soil health as well as soil productivity. It is also important in addressing the issues of agricultural sustainability. With the objectives of investigating variation in soil properties under...
The prediction of the long term trace element mobility in anthropogenic soils would be a way to anticipate land management and should help in reusing slightly contaminated materials. In the present study, iron (Fe) and zinc (Zn) status evolution was investigated in a 100-year old Technosol. The site of investigation is an old brownfield located in the Nord-Pas-de-Calais region (France) which has not...
The interaction of radiosamarium (RSm), represented here by the 151Sm isotope, a trivalent lanthanide radioisotope of particular concern due to its presence in radioactive waste, was evaluated in 30 soils with contrasting characteristics by determining sorption and desorption parameters. Solid-liquid distribution coefficients (Kd) were in the range of 102–105Lkg−1 and desorbed fractions were always...
Soil depth has played a key role in the development of soil survey, implementation of soil-specific management and validation of hydrological models. Generally, soil depth at field scale is difficult to map due to complex interactions of factors of soil formation at field scale. As a result, the conventional sampling schemes to map soil depth are generally laborious, time consuming and expensive....
Potassium (K) is a crucial element for plant nutrition and its availability and spatial distribution in agricultural soils is influenced by many agro-environmental factors. In Switzerland, a soil monitoring network (FRIBO) was established in 1987 with 250 sites distributed over the whole of the canton of Fribourg (representing 4% of the surface area of Switzerland), whose territory is shared between...
Machine-learners used for digital soil mapping are generally trained using either data derived from field-observed soil pits or from soil survey polygons - although no direct comparison of the accuracy resulting from the two methods has yet to be undertaken. This study examined such a comparison over the Okanagan Valley and Kamloops region of British Columbia where good quality soil pit and soil survey...
In this paper a spatial downscaling method is explored for generating appropriate farm scale digital soil maps. The digital soil map product to be downscaled is an Australian national extent soil carbon map (100m grid resolution). Taking into account the associated prediction uncertainties of this map, we used a simulation approach based on Gaussian random fields to generate plausible mapping realisations...
The particle size distribution (PSD) of the splashed sediment is expected to vary depending on rainfall intensity, slope steepness and slope position. This study therefore discusses the results of analysis of laboratorial experiments to compare PSDs of splashed materials in upward and downward directions of splash cup with original soil PSDs before runoff initiation from different parts of an erosion...
Perennial herbaceous biofeedstocks (PHB) have been proposed to confer multiple ecosystem services to agricultural lands. However, the role of PHBs to affect change in soil condition is not well documented, particularly for treatments with multiple species. The objective of this study was to quantify potential changes to soil properties resulting from PHB treatments in central and western North Dakota...
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