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Water pulses and biogeochemical cycles in arid and semiarid ecosystems

  • Pulse Events and Arid Ecosystems
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Abstract

The episodic nature of water availability in arid and semiarid ecosystems has significant consequences on belowground carbon and nutrient cycling. Pulsed water events directly control belowground processes through soil wet-dry cycles. Rapid soil microbial response to incident moisture availability often results in almost instantaneous C and N mineralization, followed by shifts in C/N of microbially available substrate, and an offset in the balance between nutrient immobilization and mineralization. Nitrogen inputs from biological soil crusts are also highly sensitive to pulsed rain events, and nitrogen losses, particularly gaseous losses due to denitrification and nitrate leaching, are tightly linked to pulses of water availability. The magnitude of the effect of water pulses on carbon and nutrient pools, however, depends on the distribution of resource availability and soil organisms, both of which are strongly affected by the spatial and temporal heterogeneity of vegetation cover, topographic position and soil texture. The ‘inverse texture hypothesis’ for net primary production in water-limited ecosystems suggests that coarse-textured soils have higher NPP than fine-textured soils in very arid zones due to reduced evaporative losses, while NPP is greater in fine-textured soils in higher rainfall ecosystems due to increased water-holding capacity. With respect to belowground processes, fine-textured soils tend to have higher water-holding capacity and labile C and N pools than coarse-textured soils, and often show a much greater flush of N mineralization. The result of the interaction of texture and pulsed rainfall events suggests a corollary hypothesis for nutrient turnover in arid and semiarid ecosystems with a linear increase of N mineralization in coarse-textured soils, but a saturating response for fine-textured soils due to the importance of soil C and N pools. Seasonal distribution of water pulses can lead to the accumulation of mineral N in the dry season, decoupling resource supply and microbial and plant demand, and resulting in increased losses via other pathways and reduction in overall soil nutrient pools. The asynchrony of resource availability, particularly nitrogen versus water due to pulsed water events, may be central to understanding the consequences for ecosystem nutrient retention and long-term effects on carbon and nutrient pools. Finally, global change effects due to changes in the nature and size of pulsed water events and increased asynchrony of water availability and growing season will likely have impacts on biogeochemical cycling in water-limited ecosystems.

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Acknowledgements

We acknowledge the support of the National Science Foundation NSF-DEB #0222313 for funding of the workshop “Resource Pulse Use in Arid Ecosystems”, which was organized by Susan Schwinning, James R. Ehleringer, Osvaldo E. Sala and Michael E. Loik at the University of Arizona. Additional support for A.T.A. came from the Inter-American Institute for Global Change Research (CRN-012) and the Fundación Antorchas of Argentina. Thanks to S. Schwinning, O. Sala, J. Ehleringer, M. Loik, and P. Groffman for helpful comments on earlier versions of this manuscript and to an anonymous reviewer for comments and suggestions for the first figure.

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Correspondence to Amy T. Austin.

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Austin, A.T., Yahdjian, L., Stark, J.M. et al. Water pulses and biogeochemical cycles in arid and semiarid ecosystems. Oecologia 141, 221–235 (2004). https://doi.org/10.1007/s00442-004-1519-1

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  • DOI: https://doi.org/10.1007/s00442-004-1519-1

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