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Significant contribution of non-vascular vegetation to global rainfall interception

Abstract

Non-vascular vegetation has been shown to capture considerable quantities of rainfall, which may affect the hydrological cycle and climate at continental scales. However, direct measurements of rainfall interception by non-vascular vegetation are confined to the local scale, which makes extrapolation to the global effects difficult. Here we use a process-based numerical simulation model to show that non-vascular vegetation contributes substantially to global rainfall interception. Inferred average global water storage capacity including non-vascular vegetation was 2.7 mm, which is consistent with field observations and markedly exceeds the values used in land surface models, which average around 0.4 mm. Consequently, we find that the total evaporation of free water from the forest canopy and soil surface increases by 61% when non-vascular vegetation is included, resulting in a global rainfall interception flux that is 22% of the terrestrial evaporative flux (compared with only 12% for simulations where interception excludes non-vascular vegetation). We thus conclude that non-vascular vegetation is likely to significantly influence global rainfall interception and evaporation with consequences for regional- to continental-scale hydrologic cycling and climate.

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Fig. 1: Interception of rainfall in the LiBry model.
Fig. 2: Global patterns of rainfall interception.
Fig. 3: Comparison of model estimates and field observations.

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Acknowledgements

The Bolin Centre for Climate Research is thanked for financial support. The Max Planck Institute for Biogeochemistry provided computational resources. P.P. acknowledges funding from the European Union FP7-ENV project PAGE21 under contract number GA282700. J.T.V.S. acknowledges funding from the United States National Science Foundation (EAR-1518726).

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P.P., J.T.V.S. and A.K. designed the study. P.P. did the modelling analyses. P.P. and J.T.V.S. did the literature research for the model validation. P.P. and J.T.V.S. wrote the paper with input from A.K.

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Correspondence to Philipp Porada.

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The authors declare no competing interests.

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Supplementary Information

Supplementary Tables 1 and 2; Supplementary References

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Porada, P., Van Stan, J.T. & Kleidon, A. Significant contribution of non-vascular vegetation to global rainfall interception. Nature Geosci 11, 563–567 (2018). https://doi.org/10.1038/s41561-018-0176-7

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