Plant carbon allocation, soil carbon and nutrient condition, and microbial community jointly regulate microbial biomass carbon accumulation

IF 3.9 2区农林科学 Q1 AGRONOMY

Plant and Soil Pub Date : 2025-02-07 DOI:10.1007/s11104-025-07261-5

Huijuan Xia, Youchao Chen, Zhi Yu, Xiaomin Zeng, Shuwei Yin, Xinshuai Li, Kerong Zhang

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引用次数: 0

Abstract

Background and aims

Microbial biomass carbon (MBC) has a significant contribution to soil carbon (C) pool. It has been suggested that plant input, soil C and nutrient condition, and microbial characteristic play crucial roles in MBC accumulation. However, the primary driver of MBC accumulation remains uncertain.

Methods

To fill this knowledge gap, we conducted a greenhouse ¹³CO₂ labelling experiment by planting three pioneer species (Pinus tabuliformis, Betula platyphylla, Populus purdomii) in soils collected from three different depths, i.e., top-soil (0–10 cm), mid-soil (10–30 cm), and deep-soil (30–100 cm).

Results

We found that MB¹³C positively correlated with plant aboveground and belowground ¹³C. The effects of plant ¹³C on MBC accumulation were mainly mediated by fungal diversity and composition. Specifically, mycorrhizal fungi (e.g., Peziza) and toxigenic genera (e.g., Fusarium and Penicillium) were identified as crucial fungal taxa. Notably, plant ¹³C allocation (aboveground ¹³C, belowground ¹³C, proportion of aboveground ¹³C, and proportion of belowground ¹³C) explained a larger proportion (17.50%) of MB¹³C variation among treatments than did soil available phosphorus contents and microbial community structure (fungal diversity and composition) (1.98%).

Conclusion

Our study suggests that plant inputs are major determinants of soil C storage, as plant C allocation was identified as the primary driver of MBC accumulation. Given the different roles of fungi and bacteria, separating fungal and bacterial biomass C can refine our understanding of MBC accumulation.

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来源期刊

Plant and Soil 农林科学-农艺学

CiteScore

8.20

自引率

8.20%

发文量

543

审稿时长

2.5 months

期刊介绍： Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.