NITROGEN FIXING ACTIVITY IN WARTY LENTICELLATE TREE BARKS

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Detached lenticellate warty bark of Inga laurina was first shown to develop acetylene reducing activity (ARA) (18 nmol C_2H_2 red・g^<-1>(F.W.)・hr^<-1>) after a few days' incubation with ambient air containing 0.10 atm C_2H_2. Similar N_2ase development was found to occur with warty barks of many other plant species including 12 leguminous and 9 non-leguminous trees growing in wet tropical and temperate forests. Among them higher activities (%gt; 7 nmol C_2H_2red・g^<-1>(F.W.)・hr^<-1>) were recorded in Inga laurina, Cynometra ramiflora, Cassia siamea, Robinia pseudo-acacia, Albizia julibrissin in the leguminous plants, and Ilex crenata, Ilex pedunculosa, Phizophora mucronata, Bruguiera gymnorrhiza and Mallotus japonicus in the non-leguminous plants. The development of ARA was often accelerated under lower pO_2 (0.05 atm) and pC_2H_2 (0.05 atm). Complete replacement of O_2 with N_2 or Ar in the incubation atmosphere resulted in full suppression of the development of N_2ase activity. When ARA measurement was made with intact barks of natural stands (Robinia pseudo-acacia, Ilex pedunculosa and Mallotus japonicus), it was found that all of these intact barks were reducing C_2H_2 linearly without any time lag. The activities recorded were 4.6-11.5 nmol C_2H_2redg^<-1>(F.W.)hr^<-1> corresponding to 1.19-1.27 nmol redcm^<-2>hr^<-1>. These values roughly coincided with ARA of detached warty barks of the same plant species. The present results suggest that in situ N_2-fixation in tree barks of the forests would amount to several 10 kgha^<-1>hear^<-1> in temperate and tropical wet forests.
社団法人日本土壌肥料学会の論文

NITROGEN FIXING ACTIVITY IN WARTY LENTICELLATE TREE BARKS

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