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Linking soil depth to aridity effects on soil microbial community composition, diversity and resource limitation

He, Haoran ; Xu, Mingzhe ; Li, Wenting ; Chen, Li ; Chen, Yanan ; Moorhead, Daryl L. ; Brangarí, Albert C. LU ; Liu, Ji ; Cui, Yongxing and Zeng, Yi , et al. (2023) In Catena 232.
Abstract

With ongoing climate change, aridity is increasing worldwide, affecting biodiversity and ecosystem function in drylands. However, how the depth-profile microbial community structure and metabolic limitations change along aridity gradients are still poorly explored. Here, 16S rRNA and ITS amplicon sequencing and ecoenzymatic stoichiometry analysis were used to investigate both bacterial and fungal diversities and resource limitations in 1 m depth profiles across a wide aridity gradient (0.51–0.78) in a semiarid region. Results showed a sharp decrease in microbial diversity with soil depth, accompanied by an increase in microbial phosphorus (P) vs. N (nitrogen) limitation and a decrease in microbial carbon (C) vs. nutrient limitation.... (More)

With ongoing climate change, aridity is increasing worldwide, affecting biodiversity and ecosystem function in drylands. However, how the depth-profile microbial community structure and metabolic limitations change along aridity gradients are still poorly explored. Here, 16S rRNA and ITS amplicon sequencing and ecoenzymatic stoichiometry analysis were used to investigate both bacterial and fungal diversities and resource limitations in 1 m depth profiles across a wide aridity gradient (0.51–0.78) in a semiarid region. Results showed a sharp decrease in microbial diversity with soil depth, accompanied by an increase in microbial phosphorus (P) vs. N (nitrogen) limitation and a decrease in microbial carbon (C) vs. nutrient limitation. Aridity led to a strong shift in microbial community composition, but aridity has a threshold effect on microbial resource limitation through impacts on soil pH and C/P or N/P. When the aridity threshold (1-precipitation/evapotranspiration) exceeds 0.65, relationship between aridity and microbial resource demand was decoupled; but at aridity threshold = 0.65, microbial relative C limitation and C-acquiring enzyme activity dropped. These results suggest that aridity might have a stronger influence on microbial community composition, than on diversity, shaped by inherent soil biotic factors (i.e., MBC:MBP or MBN:MBP). These findings suggest that soil microbial diversity or enzymatic stoichiometry may be not necessary to mirror changes in water availability in the drylands, while aridity would be well explained by microbial community composition.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Aridity, Climate change, Community structure, Depth profile, Metabolism limitation, Soil microorganism
in
Catena
volume
232
article number
107393
pages
14 pages
publisher
Elsevier
external identifiers
  • scopus:85166640163
ISSN
0341-8162
DOI
10.1016/j.catena.2023.107393
language
English
LU publication?
yes
id
faed4bd3-d18f-4595-acb1-7053b6eb8d47
date added to LUP
2023-08-21 11:02:18
date last changed
2023-08-25 08:18:05
@article{faed4bd3-d18f-4595-acb1-7053b6eb8d47,
  abstract     = {{<p>With ongoing climate change, aridity is increasing worldwide, affecting biodiversity and ecosystem function in drylands. However, how the depth-profile microbial community structure and metabolic limitations change along aridity gradients are still poorly explored. Here, 16S rRNA and ITS amplicon sequencing and ecoenzymatic stoichiometry analysis were used to investigate both bacterial and fungal diversities and resource limitations in 1 m depth profiles across a wide aridity gradient (0.51–0.78) in a semiarid region. Results showed a sharp decrease in microbial diversity with soil depth, accompanied by an increase in microbial phosphorus (P) vs. N (nitrogen) limitation and a decrease in microbial carbon (C) vs. nutrient limitation. Aridity led to a strong shift in microbial community composition, but aridity has a threshold effect on microbial resource limitation through impacts on soil pH and C/P or N/P. When the aridity threshold (1-precipitation/evapotranspiration) exceeds 0.65, relationship between aridity and microbial resource demand was decoupled; but at aridity threshold = 0.65, microbial relative C limitation and C-acquiring enzyme activity dropped. These results suggest that aridity might have a stronger influence on microbial community composition, than on diversity, shaped by inherent soil biotic factors (i.e., MBC:MBP or MBN:MBP). These findings suggest that soil microbial diversity or enzymatic stoichiometry may be not necessary to mirror changes in water availability in the drylands, while aridity would be well explained by microbial community composition.</p>}},
  author       = {{He, Haoran and Xu, Mingzhe and Li, Wenting and Chen, Li and Chen, Yanan and Moorhead, Daryl L. and Brangarí, Albert C. and Liu, Ji and Cui, Yongxing and Zeng, Yi and Zhang, Zhiqin and Duan, Chengjiao and Huang, Min and Fang, Linchuan}},
  issn         = {{0341-8162}},
  keywords     = {{Aridity; Climate change; Community structure; Depth profile; Metabolism limitation; Soil microorganism}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Catena}},
  title        = {{Linking soil depth to aridity effects on soil microbial community composition, diversity and resource limitation}},
  url          = {{http://dx.doi.org/10.1016/j.catena.2023.107393}},
  doi          = {{10.1016/j.catena.2023.107393}},
  volume       = {{232}},
  year         = {{2023}},
}