Abstract
Rates of C 2H 2-reduction in surface soil and litter from pine and eucalypt forests were measured for 1 yr. Rates of reduction increased significantly with moisture content, and mean rates (nmol kg −1 h −1) decreased in the order pine litter (339), eucalypt litter (220), eucalypt soil (54), pine soil (7). Asymbiotic N 2-fixation in litter and surface soil was estimated to be 108 mg m −2 yr −1 in eucalypt forest and 64 mg m −2 yr −1 in pine forest. About 80% of total fixation in eucalypt was in the soil, while 80% of the total in pine was in the litter. N 2ase was active in rotting wood but not in fresh foliage.
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