caa a22 4500 467885192 CHVBK 20180406152732.0 cr unu---uuuuu 170328e20060201xx s 000 0 eng 10.1007/s10021-004-0042-x doi (NATIONALLICENCE)springer-10.1007/s10021-004-0042-x Effects of Soil Burn Severity on Post-Fire Tree Recruitment in Boreal Forest [Elektronische Daten] [Jill Johnstone, F. Chapin III] Fire, which is the dominant disturbance in the boreal forest, creates substantial heterogeneity in soil burn severity at patch and landscape scales. We present results from five field experiments in Yukon Territory, Canada, and Alaska, USA that document the effects of soil burn severity on the germination and establishment of four common boreal trees: Picea glauca, Picea mariana, Pinus contorta subsp. latifolia, and Populus tremuloides. Burn severity had strong positive effects on seed germination and net seedling establishment after 3 years. Growth of transplanted seedlings was also significantly higher on severely burned soils. Our data and a synthesis of the literature indicated a consistent, steep decline in conifer establishment on organic soils at depths greater than 2.5 cm. A meta-analysis of seedling responses found no difference in the magnitude of severity effects on germination versus net establishment. There were, however, significant differences in establishment but not germination responses among deciduous trees, spruce, and pine, suggesting that small-seeded species experience greater mortality on lightly burned, organic soils than large-seeded species. Together, our analyses indicate that variations in burn severity can influence multiple aspects of forest stand structure, by affecting the density and composition of tree seedlings that establish after fire. These effects are predicted to be most important in moderately-drained forest stands, where a high potential variability in soil burn severity is coupled with strong severity effects on tree recruitment. Springer Science+Business Media, Inc., 2006 ecosystem structure nationallicence disturbance regime nationallicence landscape pattern nationallicence Picea mariana nationallicence Picea glauca nationallicence Pinus contorta nationallicence Populus tremuloides nationallicence post-fire regeneration nationallicence soil organic layer nationallicence Johnstone Jill Institute of Arctic Biology, University of Alaska Fairbanks, 99775, Fairbanks, Alaska, USA aut Chapin III F. Institute of Arctic Biology, University of Alaska Fairbanks, 99775, Fairbanks, Alaska, USA aut Ecosystems Springer-Verlag; www.springer-ny.com 9/1(2006-02-01), 14-31 1432-9840 9:1<14 2006 9 10021 https://doi.org/10.1007/s10021-004-0042-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10021-004-0042-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Johnstone Jill Institute of Arctic Biology, University of Alaska Fairbanks, 99775, Fairbanks, Alaska, USA aut NATIONALLICENCE 700 1- Chapin III F. Institute of Arctic Biology, University of Alaska Fairbanks, 99775, Fairbanks, Alaska, USA aut NATIONALLICENCE 773 0- Ecosystems Springer-Verlag; www.springer-ny.com 9/1(2006-02-01), 14-31 1432-9840 9:1<14 2006 9 10021 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer