数字农科院2.0

Bamboo-sourced liquid microbial fertilizer improves soil quality and ecological multifunctionality via regulating microbial necromass carbon

文献类型： 外文期刊

作者： Li, Qiaoling;Huang, Zhiyuan;Bian, Fangyuan;Zhong, Zheke;Zhang, Xiaoping

作者机构：

关键词： Liquid microbial fertilizer;Microbial necromass carbon;Stoichiometric ratio;Soil quality index;Ecological multifunctionality

期刊名称： APPLIED SOIL ECOLOGY

ISSN： 0929-1393

年卷期： 2026 年 219 卷

页码：

收录情况： SCIE（2025版）

摘要： The carbon sequestration capacity of Moso bamboo plantations plays a crucial role in mitigating climate change and enhancing soil organic carbon (SOC) storage. However, the impacts of replacing chemical fertilizers with microbial fertilizers on soil nutrients and health remain poorly understood. Bamboo-sourced liquid microbial fertilizers (BLMFs), produced from bamboo growth-promoting bacteria and bamboo shoot processing wastewater, offer a promising replacement to chemical fertilizers for promoting SOC fixation. However, the mechanisms by which active microorganisms influence the formation and decomposition of microbial necromass carbon (MNC), a key indicator of soil quality assessment, remain poorly understood. This study conducted a field experiment in a Moso bamboo plantation to investigate the relationships between soil stoichiometry ratios, enzyme activities, MNC, soil quality index (SQI), and ecological multifunctionality (EMF) under three BLMF treatments: Bacillus subtilis ACP81 (ACP81), Terribacillus goriness CS3 (CS3), and mixed ACP81 + CS3 (A + C). The results showed that BLMF treatments significantly reduced pH, total nitrogen (TN), C-acquiring enzyme activity, and enzyme stoichiometry ratios (C:Neea, C:Peea). ACP81 and CS3 led to significant declines in SOC (14.01 % and 12.76 %) and MNC (15.81 % and 23.22 %) compared to CK, while A + C significantly increased SOC (14.38 %) and MNC (7.91 %; P < 0.05). Furthermore, A + C resulted in higher SQI and EMF values than ACP81 and CS3. Correlation analysis and random forests modeling identified MNC as the most important predictor of SQI and EMF. PLS-PM further revealed that BLMF treatments affected SQI directly by regulating MNC and EMF, and indirectly through changes in SOC, enzyme activities, and stoichiometry ratios. Overall, the combined BLMF application exhibited more positive impact on soil health development than single-strain treatments. MNC emerged as a critical indicator for soil quality assessment and should be incorporated into soil health evaluation frameworks.

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