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Over the past decade, several climate extreme events have caused considerable economic damage and hardship in the Brazilian Amazon region, especially for small-scale producers. Based on household surveys and focus group interviews in the Municipality of Alenquer as well as secondary data analyses and a literature review at the regional level, this study seeks to assess rural small-scale producers…

Highlights •Random forest outperformed boosted regression tree in prediction of SOC in rangelands. •Feature selection is necessary to increase model efficiency and accuracy. •Random forest with genetic algorithm was the most promising model in predicting SOC. •Fractional cover data (bare ground fraction) is important in determining SOC stocks. Soil…

Highlights •Long-term management had legacy effects on nutrient supply potential of SOM. •Tillage-stubble retention enhanced SOM mineralisation and nutrient release (N, P, S). •Plant available N was released from the soil reserve over four months. •Plant available P and/or S were released from the soil reserve over one month. •Net immobilisation of P & S occurred…

Plants allocate recently photo-assimilated carbon (C) to aboveground and belowground organs to support their structural and non-structural components and metabolic processes1, 2, influencing the C source sink balance3 and nutrient cycling in terrestrial ecosystems4. Of the total belowground C allocation, a significant amount can be translocated from roots to soil (e.g. as exudates) and…