Soil Carbon Dynamics Following Land Use Changes and Conversion to Oil Palm Plantations in Tropical Lowlands Inferred From Radiocarbon

We measured the 14C and 13C isotopic values of soil organic carbon in mineral soil from lowland tropical forests to provide insight into how quickly carbon is turning over in the soil following conversion of primary forests to oil palm plantations. In addition to areas converted to oil palm plantations in Peru, Indonesia, and Cameroon, we examine pastures and secondary forests in Peru as a comparison to the carbon cycling processes operating in the oil palm plantations. This dataset includes radiocarbon (Δ14C) and stable carbon (δ13C) isotopes of soil organic carbon in mineral soils from natural lowland forests and oil palm plantations in Peru, Indonesia, and Cameroon. We additionally examine plots of secondary forests following agricultural use and pastures on cleared natural forest in Peru. In addition to isotopic data, this dataset includes soil carbon and nitrogen concentrations and stock, soil texture (percent sand, silt, and clay), pH, ECEC (effective cation exchange capacity), base saturation, and bulk density. Soils were sampled in 4 depth increments to 100 cm depth. This dataset supports the publication Finstad et al., 2020. Finstad, K., van Straaten, O., Veldkamp, E., & McFarlane, K. (2020). Soil carbon dynamics following land use changes and conversion to oil palm plantations in tropical lowlands inferred from radiocarbon. Global Biogeochemical Cycles, 34, e2019GB006461. https://doi.org/10.1029/2019GB006461

本研究测定了低地热带森林矿质土壤中有机碳的碳-14（14C）与碳-13（13C）同位素值，旨在解析原生林转换为油棕种植园后，土壤碳周转的速率。除秘鲁、印度尼西亚与喀麦隆的油棕种植园样区外，本研究还选取秘鲁的牧场与次生林作为对照，以对比油棕种植园的碳循环过程。本数据集涵盖秘鲁、印度尼西亚、喀麦隆的天然低地森林与油棕种植园矿质土壤中有机碳的放射性碳（Δ14C）与稳定性碳（δ13C）同位素数据。此外，本研究还针对秘鲁境内经农业开垦后的次生林样地，以及原生林被清理后用作牧场的样地开展了采样分析。除同位素数据外，本数据集还包含土壤碳、氮浓度与储量，土壤质地（砂粒、粉粒、黏粒占比），pH值，有效阳离子交换量（ECEC, effective cation exchange capacity），盐基饱和度以及容重。土壤采样按4个深度梯度进行，采样深度达100厘米。本数据集支撑Finstad等人2020年发表的研究成果：Finstad, K.、van Straaten, O.、Veldkamp, E.与McFarlane, K.（2020）。《基于放射性碳解析热带低地土地利用变化及向油棕种植园转换后的土壤碳动态》，《全球生物地球化学循环》，34卷，e2019GB006461。https://doi.org/10.1029/2019GB006461