Initial soil carbon levels regulate the divergent soil organic carbon responses to afforestation through mineral-associated organic carbon

2026-05-04

PRE

W. Lu

Jiwei Li

Hailong Zhang

Yang Liao

Wangliang Ge

Juxiao Lu

Su Wang

Ruihua Bai

Jianzhao Wu

Zhouping Shangguan *

邓

邓蕾 (Lei Deng) *

DOI：10.1016/j.still.2026.107252

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Abstract

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• SOC rose in C-poor soils but declined in C-rich soils after 20 years of afforestation. • Afforestation affects SOC and its fractions more strongly in topsoil than in subsoil. • POC dominates topsoil SOC changes, while MAOC controls subsoil SOC changes. • POC relies on plant input and microbes, whereas MAOC depends on clay and silt. • In C-poor soils, coniferous forests sequester more C than broadleaved forests.

Keywords:

Soil organic carbon

Afforestation

Mineral-associated organic carbon

Topsoil

Subsoil

Initial soil carbon levels regulate the divergent soil organic carbon responses to afforestation through mineral-associated organic carbon

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