Abstract

SEthylene formation in different litter components and soil layers from a Scots pine forest (site 1) and a mixed Scots pine and Norway spruce forest (site 2) is reported. The effects of temperature. moisture, length of incubation and anaerobic incubation on C 2H 4 formation in humus are also reported. The highest concentrations of C 2H 4 that accumulated in 24 h under ambient conditions in the laboratory were 3 and 17 parts/10 6 in humus from sites 1 and 2 respectively and 153 parts/10 6 in pine-needle litter. The most frequent microfungi from site I were tested for C 2H 4 formation on different media. A Mucor silvaticus isolate was found to form C 2H 4in the presence of methionine. The origin and significance of the C 2H 4 formed is discussed.

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