Abstract
Background and aims
In dryland regions, patches of vegetation play a crucial role in sequestering carbon and vital nutrients, creating what have been described as ‘fertile islands’ within the surface soil beneath their canopies. Nevertheless, a persistent question remains regarding the variability of fertile island effect in relation to soil depth.
Methods
To investigate this, we sampled soils at two different depths (0–30 cm and 30–50 cm) within perennial vegetation patches and open areas across 54 drylands scattered across the Tibetan Plateau. Our study focused on six key soil variables related to carbon, nitrogen, and phosphorus stocks, allowing us to assess the differences in fertile island effects at varying depths.
Results
Among the soil fertility parameters evaluated, organic carbon exhibited the most pronounced fertile island effect at both soil depths. The fertile island effect responded differently to environmental factors at the two depths assessed. In the surface soil layer, the impact of vegetation on soil carbon content intensified with increasing precipitation seasonality and precipitation in the wettest quarter but declined with increasing temperature during the driest quarter. Conversely, in the deeper soil layer, the fertile island effect for nitrogen and phosphorus intensified with greater soil sand content and vegetation greenness.
Conclusions
The fertile island effect can extend beyond the surface soil, while different environmental factors regulate the size of this effect with depth. These findings offer fresh and valuable insights into the relationships between biotic and abiotic factors and fertile island effects, a key feature of dryland ecosystems worldwide.
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Data availability
All data supporting the findings are available in the Supporting Information Data S1.
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Funding
This work was financially supported by the Second Tibetan Plateau Scientific Expedition and Research (2019QZKK0305), the Fundamental Research Funds for the Central Universities (lzujbky-2022-ct01). Fernando T. Maestre acknowledges support by the King Abdullah University of Science and Technology, and has received research support from the University of Alicante (UADIF22-74 and VIGROB22-350) and the Spanish Ministry of Science and Innovation (PID2020-116578RB-I00). David Eldridge is supported by the Hermon Slade Foundation. We are grateful to the anonymous reviewers for their constructive comments and suggestions.
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Jian-Sheng Ye designed the research. Tao Ma, Tenglong Hu and Wenbin Ke collected the samples and conducted laboratory analyses. Tao Ma, Jian-Sheng Ye, Fernando T. Maestre and David J. Eldridge wrote the manuscript. All authors read and approved the final manuscript.
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Ma, T., Maestre, F.T., Eldridge, D.J. et al. Fertile island effects across soil depths in drylands of the Tibetan Plateau. Plant Soil (2024). https://doi.org/10.1007/s11104-024-06591-0
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DOI: https://doi.org/10.1007/s11104-024-06591-0