Nitrogen dynamics in managed boreal forests: Recent advances and future research directions

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• 作者：Ryan A. Sponseller ; Michael J. Gundale ; Martyn Futter ; Eva Ring ; Annika Nordin…
• 关键词：Boreal forests ; Clear cutting ; Forest management ; Nitrogen fixation ; Plant–soil interactions ; Watersheds
• 刊名：AMBIO
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：45
• 期：2-supp
• 页码：175-187
• 全文大小：2,241 KB
• 刊物类别：Earth and Environmental Science
• 出版者：Springer Netherlands
• ISSN：1654-7209

文摘

Nitrogen (N) availability plays multiple roles in the boreal landscape, as a limiting nutrient to forest growth, determinant of terrestrial biodiversity, and agent of eutrophication in aquatic ecosystems. We review existing research on forest N dynamics in northern landscapes and address the effects of management and environmental change on internal cycling and export. Current research foci include resolving the nutritional importance of different N forms to trees and establishing how tree–mycorrhizal relationships influence N limitation. In addition, understanding how forest responses to external N inputs are mediated by above- and belowground ecosystem compartments remains an important challenge. Finally, forestry generates a mosaic of successional patches in managed forest landscapes, with differing levels of N input, biological demand, and hydrological loss. The balance among these processes influences the temporal patterns of stream water chemistry and the long-term viability of forest growth. Ultimately, managing forests to keep pace with increasing demands for biomass production, while minimizing environmental degradation, will require multi-scale and interdisciplinary perspectives on landscape N dynamics.