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Increasing N and P Resorption Efficiency and Proficiency in Northern Deciduous Hardwoods With Decreasing Foliar N and P Concentrations

Document Type

Article

Journal/Book Title/Conference

Annals-of-Forest-Science

Volume

59

Issue

3

First Page

275

Last Page

281

Publication Date

4-2002

Abstract

The objective of this study was to assess the relationships between pre-senescence leaf N and P concentrations, and resorp-

tion efficiency and proficiency of eight deciduous hardwood tree species. Trees were sampled on two sites of contrasting fertility/pro-

ductivity in southern Quebec. Measured resorption efficiencies ranged from 56 to 71% for N, and from 30 to 78% for P. Linear and

exponential models between leaf N and litter N, and between leaf P and litter P were significant. Intercepts of linear models were signifi-

cantly different from zero. Resorption efficiency and proficiency increased with a decrease in leaf N and P, and the rate of change of re-

sorption efficiency increased with leaf nutrient concentration. Concentrations corresponding to ultimate potential resorption were

calculated to be 3.2 mg N g

–1

and 0.09 mg P g

–1

. Maximum resorption efficiencies were estimated at 70% for N and 80% for P. The

concept of ultimate potential resorption in hardwoods is discussed.

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