A multiscale, hierarchical model of pulse dynamics in arid-land ecosystems

TitleA multiscale, hierarchical model of pulse dynamics in arid-land ecosystems
Publication TypeJournal Article
Year of Publication2014
AuthorsCollins S.L., Belnap J, Grimm N.B., Rudgers J.A., Dahm C., D'Odorico P, Litvak M., Natvig D.O., Peters DC, Pockman W.T., Sinsabaugh R., Wolf B.O.
JournalAnnual Review of Ecology, Evolution and Systematics
Start Page397
Date Published09/01/2014
ARIS Log Number305554
Keywordsmicrobial processes, pulse-reserve paradigm, species interactions, state transitions

Ecological processes in aridlands are often described by the pulse-reserve paradigm where rain events drive biological activity until moisture is depleted leaving a reserve. This paradigm is frequently applied to processes stimulated by one or a few rainfall events within a growing season. Here we expand the original framework in time and space, and include other pulses that interact with rainfall.This new Hierarchical Pulse Dynamics Framework integrates space and time through pulse-driven exhanges, interactions, transitions, and transfers that occur across individual to multiple pulses extending from micro to watershed scales. Climate change will likely alter the size, frequency, and intensity of precipitation pulses in the future, and aridland ecosystems are known to be highly sensitive to climate variability. Thus, a more comprehensive understanding of aridland pulse dynamics will be needed to determine how these ecosystems will respond to, and be shaped by, increased climate variability.