Physiological and nutritional changes in nitrogen fixing trees associated with autumnal senescence and chilling

In the first of two studies, autumnal leaf senescence of four temperate woody deciduous plants, autumn olive (Elaeagnus umbellata Thunb.), black locust (Robinia pseudoacadia L.), American sycamore (Platanus occidentalis L.) and honey locust (Gleditsia triacanthos L.), was studied during the autumns of 1987 and 1988 on two physically and nutritionally distinct sites in central Illinois, USA. The dinitrogen fixing species, actinorhizal (Frankia-nodulated) autumn olive and leguminous black locust (Rhizobium-nodulated), resorbed proportionally more net phosphorus (P) than nitrogen (N) from leaves prior to autumnal leaf abscission than the non-fixing species, sycamore and leguminous honey locust. Site had little effect on the net change in foliar N or P. Root bark seemed to be an important storage site for P during autumn in the dinitrogen fixing species as were buds of autumn olive. Each of the species investigated showed significant increases in twig bark concentration of N, although changes in twig bark concentrations of P were variable.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Biology

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Vogel, Christoph Steven

Contributors dc:contributor

• Dawson, Jeffrey O.

• Biology, Ecology
• Agriculture, Forestry and Wildlife
• Biology, Plant Physiology

Statement dc:rights

• Copyright 1991 Vogel, Christoph Steven

Language dc:language

eng

Identifier

AAI9136760
(UMI)AAI9136760

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/19540