Interactive effects of atmospheric CO2 and soil-N availability on fine roots of Populus tremuloides

Authors

Kurt S. Pregitzer
Donald R. Zak
Jennifer Maziasz
Jared Deforest
Peter S. Curtis
John Lussenhop

Document Type

Article

Journal/Book Title/Conference

Ecological Applications

Volume

10

Issue

1

First Page

18

Last Page

33

Publication Date

2000

Abstract

he objective of this experiment was to understand how atmospheric carbon dioxide (CO₂) and soil-nitrogen (N) availability influence Populus tremuloides fine-root growth and morphology. Soil-N availability may limit the growth response of forests to elevated CO₂ and interact with atmospheric CO₂ to alter litter quality and ecosystem carbon (C) and N cycling. We established a CO₂ x N factorial field experiment and grew six genotypes of P. tremuloides for 2.5 growing seasons in 20 large open-top chamber/root- box experimental units at the University of Michigan Biological Station in northern lower Michigan (USA). In this paper we describe an integrated examination of how atmospheric CO₂ and soil-N availability influence fine-root morphology, growth, mortality, and biomass. We also studied the relationship between root biomass and total soil respiration.

Recommended Citation

Pregitzer, K. S., Zak, D. R., Maziasz, J., DeForest, J., Curtis, P. S., & Lussenhop, J. (2000). Interactive Effects of Atmospheric CO2 and Soil-N Availability on Fine Roots of Populus tremuloides. Ecological Applications, 10(1), 18–33. https://doi.org/10.2307/2640983