数字农科院2.0

Reduction in particulate organic carbon and microbial necromass accumulation drives soil organic carbon depletion following national-scale forest conversion to tea plantations and croplands

文献类型： 外文期刊

作者： Yang, Xiangde;Jiang, Pan;Guo, Junjie;Ni, Kang;Ma, Qingxu;Ma, Lifeng;Shi, Yuanzhi;Ruan, Jianyun;Luo, Gongwen

作者机构：

关键词： Forest conversion;Tea plantations;Croplands;Soil carbon loss;Organic carbon components;Microbial residues

期刊名称： AGRICULTURE ECOSYSTEMS & ENVIRONMENT

ISSN： 0167-8809

年卷期： 2025 年 397 卷

页码：

收录情况： SCIE（2025版）

摘要： The conversion of forests into tea plantations and croplands is a prevalent land-use change driven by anthropogenic activities, attributed to increasing requirements for industrial and agricultural products. The effects of forest conversions on climate change are well-established, however, the effects on soil organic carbon (SOC) accumulation as well as the underlying mechanisms remain to be investigated in depth on a national scale. By analyzing 183 paired soil samples collected from 92 tea-producing counties across China, the study revealed that forest conversions into croplands lowered the SOC by 11.2 %; however, conversion into tea plantations caused a smaller SOC depletion. Forest conversions concurrently reduced SOC and particulate organic C (POC), but not mineral-associated organic C (MAOC). Forest conversions into croplands also significantly reduced soil microbial necromass C (MNC) accumulation (15.20 %), particularly fungal necromass C (FNC, 11.10 %). The stable contribution of FNC to the soil C pool was maintained by concurrent reductions in SOC and FNC accumulation in croplands. Linear regression analysis and structural equation modeling consistently demonstrated that SOC depletion resulting from forest conversions into croplands was primarily associated with reductions in POC and FNC accumulation. This association was found to be primarily regulated by soil nutrient contents and the ratio of soil nutrients to SOC. These findings demonstrate that the conversion of forests on a national scale is expected to result in SOC depletion in croplands under global climate change. The findings further highlight that enhancing the accumulation of unprotected fungal necromass in the POC fraction is a critical strategy for mitigating SOC depletion resulting from forest conversions.

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