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March 13, 2021Global Change BiologyOpen Access

Contrasting pathways of carbon sequestration in paddy and upland soils

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The study aims to compare organic carbon sequestration pathways in paddy and upland soils across various climate zones.
Quantified plant- and microbial-derived carbon in soils across four climate zones.
Compared efficiency of soil organic carbon sequestration between paddy and upland soils.
Analyzed soil characteristics such as temperature, pH, and clay/sand ratio.
Paddy soils were found to be 39%–127% more efficient in soil organic carbon sequestration than upland soils in warmer climates.
Microbial-derived carbon more replenished in uplands, while paddy soils had higher plant-derived carbon due to anaerobic conditions.
Land-use conversion from paddy to upland may result in a loss of 504 Tg C as CO2, predominantly from plant-derived carbon.

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Randomized trial observed contrasting carbon sequestration pathways in paddy and upland soils, indicating critical management needs.

Chen et al. (2021) studied this question.

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