Connectivity dynamics in dryland litter cycles

Moving decomposition beyond spatial stasis

Heather Throop, Jayne Belnap

Research output: Contribution to journalArticle

Abstract

Drylands (arid and semiarid ecosystems) cover nearly half of Earth's terrestrial surface, but biogeochemical pools and processes in these systems remain poorly understood. Litter can account for a substantial portion of carbon and nutrient pools in these systems, with litter decomposition exerting important controls over biogeochemical cycling. Dryland decomposition is typically treated as a spatially static process in which litter is retained and decomposed where it is initially deposited. Although this assumption is reasonable for mesic systems with continuous plant canopy cover and a stable subcanopy litter layer, dryland pools generally reflect discontinuous inputs from heterogeneous canopy cover followed by substantial litter transport. In the present article, we review horizontal and vertical transport processes that move litter from the initial deposition point and retention elements that influence litter accumulation patterns. Appreciation of the spatially dynamic litter cycle, including quantitative assessment of transport patterns, will improve estimates of the fate and distribution of organic matter in current and future drylands.

Original languageEnglish (US)
Article numberbiz061
Pages (from-to)602-614
Number of pages13
JournalBioScience
Volume69
Issue number8
DOIs
StatePublished - Aug 1 2019

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arid lands
Ecosystem
Carbon
Food
degradation
canopy
organic matter
ecosystems
carbon
nutrients

Keywords

  • arid
  • organic matter
  • retention elements
  • semiarid
  • wind and water transport

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)

Cite this

Connectivity dynamics in dryland litter cycles : Moving decomposition beyond spatial stasis. / Throop, Heather; Belnap, Jayne.

In: BioScience, Vol. 69, No. 8, biz061, 01.08.2019, p. 602-614.

Research output: Contribution to journalArticle

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