2025-11-21 中国科学院（CAS）
Conceptual diagram illustrating how multitrophic organisms adapt to P limitation under different lithological conditions. (Image by LIAO Xionghui)
＜関連情報＞
- https://english.cas.cn/newsroom/research_news/earth/202511/t20251121_1132635.shtml
- https://www.sciencedirect.com/science/article/pii/S2090123225008768
多栄養段階の生物多様性は亜熱帯生態系における土壌リンの流動化を促進する Multitrophic biodiversity drives soil phosphorus mobilization in subtropical ecosystems
Xionghui Liao, Jie Zhao, Tibor Magura, Wei Zhang, Fujing Pan, Peilei Hu, Dan Xiao, Jiangnan Li, Kelin Wang
Journal of Advanced Research Available online: 7 November 2025
DOI:https://doi.org/10.1016/j.jare.2025.11.002
Highlights
- Long-term phosphorus (P) fertilization enhances soil moderate labile and stable P storage.
- Long-term P fertilization impairs biological P mobilization capacity.
- Cropland conversion into forest accelerates soil labile and stable P mobilization.
- Efficient biological P uptake and mineral chelation result in low available P in forest soils.
Abstract
Introduction
The phosphorus (P) mobilization capacity of plants and microbes is hierarchically constrained by climatic drivers, land-use types, lithological properties, and consumer-mediated trophic cascades.
Objectives and methods
We established a latitudinal transect across contrasting lithologies (carbonate vs. siliciclastic sedimentary rocks) in subtropical southwest China to investigate how multitrophic biodiversity and trophic interactions affect soil P mobilization during cropland-to-forest succession.
Results
Cropland conversion into forest significantly increased soil labile P fractions by 43.8% in karst regions, but decreased soil moderately labile and stable P fractions by 62.6–79.1% and 34.8–36.6%, respectively, in both karst and non-karst regions. Multitrophic biodiversity and P mobilization capacity were significantly greater in karst than non-karst regions. Climate warming amplified trophic cascading effects on soil P mobilization capacity mediated by phoD-harboring bacteria in forests via increasing alkaline phosphatase activity. Karst forests developed efficient P mobilization-uptake coordination to overcome calcium/magnesium-induced P chelation constraints through tightly coupled multitrophic interactions. The multitrophic network relationships are conducive to plant P uptake, but vulnerable to species losses caused by anthropogenic disturbances (e.g., tillage and deforestation) in karst ecosystems.
Conclusion
Our findings provide a framework linking lithology-mediated P mobilization with trophic interactions to alleviate P limitation in subtropical ecosystems under global change.
