EGU24-3313, updated on 08 Mar 2024
https://doi.org/10.5194/egusphere-egu24-3313
EGU General Assembly 2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Differential adaptative strategies to phosphorus limitation in tropical rainforests dominated by trees associated with arbuscular and ectomycorrhizal fungi

Qingshui Yu
Qingshui Yu
  • Peking University, College of Urban and Environmental Sciences, Department of Ecology, China (yuqingshui@pku.edu.cn)

Tropical rainforests on low-phosphorus (P) soils are highly biodiverse and productive, playing a crucial role in climate change mitigation. However, the adaptation mechanisms of tropical rainforest dominated by trees associated with different mycorrhizal symbioses (arbuscular mycorrhizal (AM) and ectomycorrhizal fungi (ECM)) to P-deficient environments remain unclear. Through a 10-year field experiments with nitrogen (N) and P additions in AM- and ECM-dominated stands, we first investigated leaf nutrient content and resorption efficiencies of eight species in each stand. We further explored how litter, soil, and microbes maintain P supply to plants. We found that both AM- and ECM-dominated forests are P-limited. AM-dominated forest exhibited higher soil phoD gene abundance and fungal diversity, while ECM-dominated forest displayed higher soil phosphatase activity. Regression and random forest analyses revealed that AM-dominated forest employ diverse P-acquisition strategies, including increased foliar P resorption efficiency, soil phosphatase activity, and fungal diversity. In contrast, ECM-dominated forest preferred to enhance soil phosphatases activity and mineralize moderately liable P, thereby alleviating P limitation. These findings show joint influence of litter, soil, and microorganisms on plant P acquisition, and P-regulated processes vary by mycorrhizal types. Our study enhances understanding of the effects of global change on biogeochemical processes in tropical rainforests.

How to cite: Yu, Q.: Differential adaptative strategies to phosphorus limitation in tropical rainforests dominated by trees associated with arbuscular and ectomycorrhizal fungi, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-3313, https://doi.org/10.5194/egusphere-egu24-3313, 2024.