Photosynthesis, nitrogen-use efficiency, and water-use efficiency of jack pine seedlings in competition with four boreal forest plant species

Citation
De. Robinson et al., Photosynthesis, nitrogen-use efficiency, and water-use efficiency of jack pine seedlings in competition with four boreal forest plant species, CAN J FORES, 31(11), 2001, pp. 2014-2025
Citations number
33
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Plant Sciences
Journal title
CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE
ISSN journal
0045-5067 → ACNP
Volume
31
Issue
11
Year of publication
2001
Pages
2014 - 2025
Database
ISI
SICI code
0045-5067(200111)31:11<2014:PNEAWE>2.0.ZU;2-F
Abstract
The objective of this study was to understand the mechanism underlying nitr ogen (N) and water competition between jack pine (Pinus banksiana Lamb.) an d four boreal forest species. Large-leaved aster (Aster macrophyllus L.), C anada blue-joint grass (Calamagrostis canadensis (Michx.) Beauv.), tremblin g aspen (Populus tremuloides (Michx.), and red raspberry (Rubus idaeus L.) were planted at a range of densities (0-8 plants/m(2)) with jack pine seedl ings. Net photosynthesis (P-n), nitrogen-use efficiency (NUE), water-use ef ficiency (WUE) of each species were monitored over three consecutive growin g seasons. Changes in available soil N and water were also measured. Jack p ine P-n, NUE, and WUE decreased as competitor density increased, but these effects varied among species (p < 0.001) and over time (p < 0.001). The inf luence of density on jack pine P-n decreased over time for aster and blue-j oint grass and increased over time for aspen and raspberry (p < 0.001). At most sample times, jack pine P-n correlated with available soil N. In contr ast, the correlation between jack pine P-n and soil water was rarely signif icant.