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Nutrient and [CO2] elevation had synergistic effects on biomass production but not on biomass allocation of white birch seedlings.

Authors :
Zhang, Shouren
Dang, Qing-Lai
Yü, Xiaoguang
Source :
Forest Ecology & Management; Oct2006, Vol. 234 Issue 1-3, p238-244, 7p
Publication Year :
2006

Abstract

Abstract: This study investigated the interactive effects of nutrient supply and [CO<subscript>2</subscript>] elevation on the growth and biomass of white birch seedlings (Betula papyrifera Mash.). The seedlings were grown under two nutrient regimes (100ppm N, 44ppm P, 83ppm K and 1/10 the strength of these levels) and two [CO<subscript>2</subscript>] levels (360 and 720ppm) for 3.5 months. The [CO<subscript>2</subscript>] elevation had no significant effect on either height (H) or root collar diameter (RCD), but significantly reduced specific leaf area. The high nutrient treatment increased both H and RCD. High nutrient significantly increased total, stem and leaf biomass under both [CO<subscript>2</subscript>] treatments but the effect was greater under elevated [CO<subscript>2</subscript>], and it increased root biomass only under elevated [CO<subscript>2</subscript>], while [CO<subscript>2</subscript>] elevation increased total, stem, leaf and root biomass under high nutrient only. The high nutrient increased stem mass ratio (SMR) and decreased root mass ratio (RMR) under both [CO<subscript>2</subscript>] while [CO<subscript>2</subscript>] elevation reduced SMR under both nutrient treatments. [CO<subscript>2</subscript>], nutrient and their interactions had no significant effects on leaf mass ratio, or leaf to root ratio. [CO<subscript>2</subscript>] elevation reduced the leaf total N concentration and the effect was greater under low nutrient. [CO<subscript>2</subscript>] elevation had no significant effect on leaf phosphorus (P) and potassium (K) concentration while the high nutrient treatment generally increased them. [Copyright &y& Elsevier]

Subjects

Subjects :
BIOLOGY
BIOMASS
PLANTS
SEEDLINGS

Details

Language :
English
ISSN :
03781127
Volume :
234
Issue :
1-3
Database :
Supplemental Index
Journal :
Forest Ecology & Management
Publication Type :
Academic Journal
Accession number :
22473915
Full Text :
https://doi.org/10.1016/j.foreco.2006.07.017