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Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment
Published on: July 22, 2019
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Microbial phosphorus-cycling genes in soil under global change
Xuewei Wang1, Hui Guo2, Jianing Wang1
1State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Centre for Grassland Microbiome, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, Gansu, China.
Global Change Biology
|April 15, 2024
Summary
Climate change impacts phosphorus cycling in Tibetan alpine soils. Warming and increased precipitation boost microbial phosphorus cycling, enhancing P availability for plants and microbes.
Area of Science:
- Environmental Science
- Microbiology
- Soil Science
Background:
- Climate change, specifically warming and altered precipitation, significantly affects biogeochemical cycles in alpine ecosystems.
- Phosphorus (P) cycling in P-limited alpine meadow soils on the Tibetan Plateau is sensitive to environmental changes.
- The effects of climate change on bacterial phosphorus cycling genes (PCGs) and P transformation remain poorly understood in these ecosystems.
Purpose of the Study:
- To investigate the individual and combined effects of warming and altered precipitation on soil PCGs and P transformation.
- To understand the response of extracellular and intracellular P cycling genes to climate change factors.
- To identify key microbial metabolic pathways involved in P cycling under changing climate conditions.
Main Methods:
- Metagenomic analysis was employed to assess bacterial PCG communities.
- A manipulation experiment simulated warming and altered precipitation scenarios.
- Soil bioavailable phosphorus (Olsen-P) and organic phosphorus (NaOH-Po) were quantified.
Main Results:
- Warming and increased precipitation individually increased bioavailable P (AP) by 13% and 20%, respectively, primarily through enhanced organic P hydrolysis.
- Decreased precipitation led to a 5.3% reduction in soil AP.
- The abundance and richness of PCGs were more sensitive to warming than altered precipitation, with combined warming and increased precipitation showing a positive effect, unlike individual factors.
Conclusions:
- Warming, particularly when combined with increased precipitation, significantly enhances microbial P cycling, accelerating both extracellular and intracellular processes.
- Specific intracellular PCGs involved in pyruvate metabolism, phosphotransferase systems, oxidative phosphorylation, and purine metabolism correlated with P pools.
- Warming stimulated bacteria with extracellular P cycling genes (phoD, phoX), boosting organic P mineralization and P bioavailability in alpine soils.
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