Higher rates of decomposition in standing vs. surface litter in a Mediterranean ecosystem during the dry and the wet seasons

Daniel Gliksman*, Yael Navon, Rita Dumbur, Sabine Haenel, José M. Grünzweig

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Aims: Plant litter decomposition in drylands is not well understood, and even less is known about decay of the abundant standing dead residues. Here, we followed decomposition of standing and surface litter, and assessed the underlying drivers and mechanisms. Methods: In a field experiment during contrasting seasons, litterbags were suspended at 0.05 and 1 m above ground (standing litter) and were placed on the ground (surface litter). We also quantified the moisture content of free-standing litter. Results: During nighttime in the dry, rainless season, minimum temperature was 2–3 °C lower in standing litter, leading to higher litter moisture and a doubling of microbially-driven CO2 emissions from standing compared with surface litter. Free-standing litter moisture increased linearly with height to almost 2 m above ground. Ultimately, mass loss was higher in standing than in surface litter during the dry season (11–12% vs. 7%) and over both the dry and the wet seasons (27–34% vs. 23%), and was positively related to potentially active microbial biomass. Conclusions: Our results suggest that standing litter decomposed faster than surface litter because of enhanced microbial degradation, and possibly photodegradation, all-year-round. Therefore, carbon turnover in drylands and beyond may be underestimated by only considering surface litter decay.

Original languageAmerican English
Pages (from-to)427-439
Number of pages13
JournalPlant and Soil
Volume428
Issue number1-2
DOIs
StatePublished - 1 Jul 2018

Bibliographical note

Publisher Copyright:
© 2018, Springer International Publishing AG, part of Springer Nature.

Keywords

  • Drylands
  • Litter CO emissions
  • Litter moisture content
  • Microbial degradation
  • Photodegradation
  • Water vapor

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