Nitrogen fixation by root nodules of Coriaria

Abstract

Coriaria is the most widespread and vigorous genus of nodulated, nitrogen fixing plants in the native flora of New Zealand. The following study is concerned with the impact that Coriaria, and in particular C. arborea, has on the nitrogen economy of natural communities. Included in this research were experiments on the physiology and metabolism of atmospheric nitrogen fixation, cytological investigations of nodules and endophyte, and ecological studies on the role of Coriaria in pioneer vegetation. The subject of nitrogen fixation has been frequently reviewed recently. A review of nitrogen fixation in native communities of New Zealand is given in which the importance of non-legume plants is emphasised and distribution of Coriaria described. Observations on the significance of Coriaria in New Zealand are supported with data on productivity and nitrogen accumulation in a primary succession. These results are confirmed in studies of C. arborea growing in sand culture, the fixed nitrogen being rapidly translocated from nodule to host.