Black spruce seedlings in a Kalmia–Vaccinium association: microsite manipulation to explore interactions in the field

$50.00 plus tax (Refund Policy)

Buy Article:

Abstract:

We established a field trial on an ericaceous-dominated clearcut in Quebec to determine the effect of Kalmia angustifolia L., Vaccinium angustifolium (Ait.), and V. myrtilloides (Michx.) on the growth and physiology of black spruce (Picea mariana (Mill.) BSP) seedlings and on soil characteristics over the first two growing seasons. Plots undergoing one of three treatments (shrub removal, humus removal, or undisturbed control) were planted with black spruce seedlings that were either unfertilized or spot fertilized at time of planting. In some of the undisturbed control plots, we also used 15NH415NO3 to compare uptake of broadcast N fertilizer by vegetation. The ericaceous shrubs had a significant negative impact on seedling growth. Growth reductions were not related to water stress, soil temperature, or soil moisture. Extractable NH4-N and P concentrations in mineral soil tended to decrease in the presence of ericaceous shrubs, but effects were not significant. Seedling foliar N concentration was also reduced in the presence of ericaceous shrubs. Of the total amount of 15N fertilizer found in vegetation, 64% was immobilized in Vaccinium spp., 31% in Kalmia, and 5% in black spruce, but spruce took up more 15N per unit of root biomass than the ericaceous shrubs. Kalmia had consistently higher predawn xylem water potentials than black spruce.

Nous avons entrepris une expérience sur une station récemment coupée au Québec et dominée par les éricacées, afin d'étudier les effets de ces arbustes (Kalmia angustifolia L., Vaccinium angustifolium (Ait.), et V. myrtilloides (Michx.)) sur la croissance et la physiologie de plants d'épinette noire (Picea mariana (Mill.) BSP) et sur les caractéristiques du sol pendant les deux premières saisons de croissance. Nous avons reboisé des parcelles exemptes de végétation, d'humus et témoins avec des plants d'épinette noire qui ont reçu ou non un engrais lors de la mise en terre. Dans certaines parcelles témoins, nous avons également utilisé du 15NH415NO3 pour comparer l'absorption de l'engrais par la végétation. Les éricacées ont significativement diminué la croissance des plants. Cette réduction n'était pas liée au stress hydrique, à la température ou à l'humidité du sol. Les éricacées ont eu tendance à réduire les concentrations de NH4-N et de P du sol minéral, mais les effets n'étaient pas significatifs. Les éricacées ont réduit la concentration foliaire en N des plants. Sur la quantité totale de 15N récupéré dans la végétation, 64 % a été immobilisé dans le Vaccinium spp., 31 % dans le Kalmia et 5 % dans l'épinette noire, mais l'épinette a absorbé davantage de 15N par unité de biomasse racinaire que les éricacées. Le Kalmia avait constamment des potentiels hydriques préaube supérieurs à ceux de l'épinette.

Document Type: Research Article

Publication date: August 1, 2004

More about this publication?
  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
  • Information for Authors
  • Submit a Paper
  • Subscribe to this Title
  • Terms & Conditions
  • Sample Issue
  • Reprints & Permissions
  • ingentaconnect is not responsible for the content or availability of external websites
Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more