Decomposition of tree leaf litter on pavement

Implications for urban water quality

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Leaf litter may be an important source of nutrients to stormwater and ultimately contribute to eutrophication of surface waters associated with urbanization. Thus, understanding decomposition and nutrient release from leaf litter that falls on impervious surfaces is important for stormwater management. However, few studies have examined leaf litter decomposition in the unique urban environment of the street gutter. We compared decomposition of leaf litter of five street tree species in a parking lot gutter in St. Paul, Minnesota, USA. In contrast to our expectations, comparisons with past studies revealed that litter decomposed more rapidly in the gutter than in nearby natural areas. And decomposition rates were as rapid as those measured in other urban settings (forests and streams), with most species losing 80 % of their initial mass after 1 year. Litter of most species had retained more than half of its initial N and P after 1 year. However, in contrast to N, litter P dynamics largely were uncoupled from litter mass dynamics, with litter P increasing and decreasing unpredictably over the year. Short-term (24 h) laboratory studies revealed that litter had the potential to lose a high fraction of its initial P, with high variation among species (from 27 to 88 %), and a smaller fraction of its initial N (<10 %) via leaching. Thus, street tree species may differ in their potential contributions to nutrients that are released during decomposition. Our results suggest that careful selection of street tree species and timely removal of litterfall have significant potential to reduce nutrient fluxes from streets to storm drains, particularly for P.

Original languageEnglish (US)
Pages (from-to)369-385
Number of pages17
JournalUrban Ecosystems
Volume17
Issue number2
DOIs
StatePublished - Jan 1 2014

Fingerprint

leaf litter
pavement
litter
decomposition
water quality
water
urbanization
nutrient
litterfall
stormwater
management
parking
drain
urban water
eutrophication
leaching
surface water

Keywords

  • Leaf litter decomposition
  • Nitrogen
  • Phosphorus
  • Street tree
  • Urban

Cite this

Decomposition of tree leaf litter on pavement : Implications for urban water quality. / Hobbie, Sarah E.; Baker, Lawrence A.; Buyarski, Christopher; Nidzgorski, Daniel; Finlay, Jacques C.

In: Urban Ecosystems, Vol. 17, No. 2, 01.01.2014, p. 369-385.

Research output: Contribution to journalArticle

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