Abstract
The land use effect on soil chemical attributes and the soil organic carbon (SOC) sequestration in soil aggregates of tropical forest patches from the Brazilian semiarid have been neglected. This study aimed to investigate the effects of land use on the soil fertility and dynamics of aggregates and associated cementing agents (SOC and iron oxides). Bulk soil samples under three land uses (forest, agroforestry system, and pasture) in different layers (0.0–0.2 and 0.2–0.4 m) were collected in humid highlands from Northeastern Brazil, named ‘Brejos de Altitude’. Soil acidity, exchangeable cations, availability P, and SOC were determined. The stability and size distribution of soil aggregates was measured as mean weight diameter (MWD). The samples were separated into six aggregate size fractions (< 2, 2–1, 1–0.5, 0.5–0.25, 0.25–0.106, and 0.106–0.053 mm) and evaluated for SOC and iron oxides (Fed). Our study indicated that agroforestry practices had an important effect on soil fertility, significantly increasing the content and cycling of Ca and P in the soils. The land use explained 75% variation of soil aggregates, in which SOC and Fed interactions contributed 55%. Conversion from forest to pasture significantly (p < 0.05) decreased the SOC in each aggregate size, while the agroforestry did not change. The agroforestry increased the potential of soils as SOC sink in microaggregates, suggesting higher storage and stabilization of SOC in the long term. SOC and Fed had significant effects (p < 0.05) on the stability of macroaggregates and microaggregates of soils under agroforestry, respectively. Agroforestry systems represent a sustainable practice for soil fertility improvement and SOC sink in the highlands of Brazilian Northeast.
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This research was funded by Conselho Nacional de Desenvolvimento Técnico e Científico, Grant No. 400014/2022–0.
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Conceptualization RM and CS; Methodology RM and CS; Software LM; Formal analysis LM; Investigation RM and CS; Data curation RM, CS and LM; Writing—original draft preparation, RM LM; Writing—review and editing, LM, KC and MC; Visualization, RM, LM and KC; Supervision AB; Project administration CS; Funding acquisition RB and AB. All au-thors have read and agreed to the published version of the manuscript.
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Macedo, R.S., Moro, L., dos Santos Sousa, C. et al. Agroforestry can improve soil fertility and aggregate-associated carbon in highland soils in the Brazilian northeast. Agroforest Syst (2023). https://doi.org/10.1007/s10457-023-00875-7
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DOI: https://doi.org/10.1007/s10457-023-00875-7