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Biological aspects of nitrogen mineralization in humus from a pine forest podsol incubated under different moisture and temperature conditions

Författare:
Publiceringsår: 1981
Språk: Engelska
Sidor: 137-145
Publikation/Tidskrift/Serie: Oikos
Volym: 37
Nummer: 2
Dokumenttyp: Artikel i tidskrift
Förlag: Wiley-Blackwell

Sammanfattning

Abstract in Undetermined

Fluctuations of soil organism abundance, soil respiration and inorganic nitrogen were

studied in a laboratory experiment on material taken from the humus layer of a Scots

pine forest and incubated under different moisture and temperature regimes. The

experiment was run for 28 wk with samplings every 7 wk. At 28 wk, increases in

"total movable N" (inorganic N + biomass N) were observed in samples incubated at

high temperature and/or high moisture content. Most of the N was found in biomass

except in incubations at the highest temperatures and moistures. Under those conditions,

high abundance of nematodes occurred together with drastically increased

amounts of inorganic N. Low values of inorganic N were recorded under conditions

common in the field. No obvious relations could be detected between standing crops

of bacteria and temperature, moisture or respiration. The number of bacterial-feeding

nematodes seemed to be a possible measure of previous bacterial production

contributing more information than the standing crop measurements of the bacteria,

which varied little despite the direct evidence of substantial bacterial production in

some incubation conditions.

Nyckelord

  • Biological Sciences

Övriga

Published
  • Microbial Ecology
  • ISSN: 1600-0706

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