Soil carbon, nitrogen, isotopic composition (δ¹³C), fertility and texture under different land-use systems in northeastern Amazonia (AF and AW climates).
Description
This dataset contains soil physical, chemical and isotopic data collected under different land-use systems located in northeastern Amazonia, representing two Köppen climate types (AF and AW). Soil samples were collected from trenches down to 100 cm depth at eight intervals (0–5, 5–10, 10–20, 20–30, 30–40, 40–60, 60–80, 80–100 cm). The dataset includes measurements of soil bulk density, carbon (C) and nitrogen (N) concentrations, conventional C and N stocks, and equivalent soil mass–corrected stocks for both 0–30 cm and 0–100 cm. Isotopic composition (δ¹³C) was determined to estimate the relative contribution of C₃- and C₄-derived carbon across land-use systems and depths. Soil fertility data include pH, organic matter, macronutrients (P, K, Ca, Mg), exchangeable acidity (Al, H+Al), sum of bases, effective CEC, CEC at pH 7.0, base saturation (V%) and aluminum saturation (M%). Soil texture (coarse sand, fine sand, silt and clay) was also determined.The dataset supports analyses of land-use change impacts on soil carbon and nitrogen dynamics, isotopic signatures, soil fertility, and texture in tropical landscapes. All variables are organized into separate tabs (bulk density, carbon stock, nitrogen stock, δ¹³C for AF and AW climates, soil fertility, and soil texture), facilitating reproducibility and reuse.
Files
Steps to reproduce
Soil samples were collected from trenches (1 m³) at eight depth intervals (0–5, 5–10, 10–20, 20–30, 30–40, 40–60, 60–80, 80–100 cm). Undisturbed samples were obtained using stainless-steel cores (100.6 cm³) to determine bulk density after oven-drying at 105 °C. Disturbed samples from the same depths were homogenized and used to determine total carbon (C) and nitrogen (N) concentrations by dry combustion in an elemental analyzer. Soil δ¹³C was measured using continuous-flow isotope ratio mass spectrometry (CF-IRMS) to estimate the contribution of C₃- and C₄-derived carbon at each depth. Soil C and N stocks (Mg ha⁻¹) were calculated using bulk density and layer thickness for each depth interval. Equivalent soil mass–corrected stocks (0–30 and 0–100 cm) were computed following the ESM method, using the system with the lowest bulk density as reference. Soil fertility attributes (pH, organic matter, P, K, Ca, Mg, Al, H+Al, SB, effective CEC, CEC at pH 7.0, V%, M%) were determined using standard soil chemistry protocols. Soil texture (coarse sand, fine sand, silt and clay) was analyzed using the hydrometer/pipette method. All results were compiled into thematic tabs (bulk density, carbon stock, nitrogen stock, δ¹³C for AF and AW climates, soil fertility and soil texture) to allow reproducibility and reuse.
Institutions
- Universidade Federal Rural da Amazonia
- Universidade Estadual Paulista Julio de Mesquita Filho
Categories
Funders
- National Council for Scientific and Technological DevelopmentMinistry of Science, Technology and InnovationBrazilGrant ID: 88887.510270/2020-00