Response of Western redcedar to release and fertilization in a mixed-species stand

Brodie, Leslie C.; Harrington, Constance A.

doi:10.2737/pnw-gtr-828

Cited by 3 publications

(1 citation statement)

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“…Aus der Vielzahl nordamerikanischer Durchforstungsversuche konnten mehrheitlich signifikante Zuwachssteigerungen (Durchmesser-, Kreisflächen-oder teilweise Höhenzuwachs) der freigestellten Thujen nachgewiesen werden (z. B. HARRINGTON und BRODIE und HARRINGTON, 2010), wobei der Durchforstungseffekt bis zu 25 Jahre nach der Freistellungsmaßnahme nachweisbar war (DE-VINE und HARRINGTON und DEVINE, 2011). Diese Reaktionsfähigkeit war im vorliegenden Untersuchungsbestand im fortgeschritten Zeitraum (4-6 Jahre nach der Durchforstung) ebenfalls deutlich, sodass die Individuen längerfristig von der Maßnahme profitierten (Tab.…”

Section: Baumartenspezifische Zuwachsreaktionenunclassified

Zuwachspotenziale und Klimasensitivität eingeführter Baumarten in Nordrhein-Westfalen

Nils¹

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Section: Baumartenspezifische Zuwachsreaktionenunclassified

Zuwachspotenziale und Klimasensitivität eingeführter Baumarten in Nordrhein-Westfalen

Nils¹

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Productivity of coastal Douglas-fir and western redcedar in response to species mixture, planting density, and soil carbon:nitrogen ratio

2021

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Mixed-species plantations have been suggested as ecologically and economically viable alternatives to monocultures. We examined the growth response of coastal Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco) and western redcedar (Thuja plicata Donn ex D. Don in Lamb.) to different species mixtures (Douglas-fir : western redcedar mixtures of 1:0, 1:1, 1:3, and 0:1) and planting densities (500, 1000, and 1500 stems·ha−1) in a dry maritime forest on eastern Vancouver Island, Canada. Twenty-two years postplanting, species mixture significantly affected diameter and height growth (p < 0.001), with stand diameter and height generally decreasing with increasing redcedar composition. Inherent variation in soil productivity across the plantation (carbon:nitrogen ratio) equally constrained stand growth. The widest spacing had larger diameter than the closest spacing (p = 0.025) but the least stand basal area compared with the other spacing treatments (p = 0.003–0.031). Stand volume was significantly affected by mixture × density interaction (p = 0.024) and generally declined with increasing proportion of redcedar and decreasing stand density. In the first decades after plantation establishment, inherent species growth traits and soil fertility were most important in dictating stand productivity. Because of the differences in resource utilization of both species, stand dynamics may change as competition for light and soil resources increases. Evaluation of silvicultural recommendations regarding mixtures of both species will continue with plantation development.

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Postglacial climate and fire‐mediated vegetation change on the western Olympic Peninsula, Washington (USA)

Gavin

Brubaker

Greenwald

2013

Ecological Monographs

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The mode and tempo of forest compositional change during periods of rapid climate change, including the potential for the fire regime to produce nonlinear relationships between climate and vegetation, is a long‐standing theme of forest ecological research. In the old conifer forests of the coastal Pacific Northwest, fire disturbances are sufficiently rare that their relation to climate and their ecological effects are poorly understood. We used a 14 700‐year high‐resolution sediment record from Yahoo Lake on the Olympic Peninsula, Washington, USA, to examine vegetation (landscape vegetation from pollen and local vegetation from macrofossils) and fire (landscape fire from total charcoal and local fire from charcoal peaks) in conjunction with independent records of climate. We hypothesized that the successional stage of the local forest will exhibit alternate stable states over a range of fire activity, that species turnover will increase abruptly above a certain level of fire activity and that both responses would be more gradual at the landscape scale than the local scale. Supporting these hypotheses, at the local scale, we found strong evidence for alternate stable states of late vs. early successional communities and inertia of species turnover to changing fire activity. At the landscape scale, vegetation responded more gradually to changing fire activity. From 14 700 to 7000 years ago, high landscape vegetation turnover occurred along with high landscape fire activity, especially during the warm summers of the early Holocene. In several instances, local species turned over completely following fire events but several centuries after climate change. In contrast, during the last 7000 years, the local forest composition was dominated by late‐successional species with little species turnover, despite periods of moderate fire activity. We suggest that the relatively minor climate fluctuations of the past 7000 years were not sufficient to cause large‐scale species turnover after fire. The Yahoo Lake fire and vegetation record of the early Holocene provides a model for dramatic ecosystem change following an anticipated shift to warmer summer temperatures.

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Response of Western redcedar to release and fertilization in a mixed-species stand

Cited by 3 publications

References 23 publications

Zuwachspotenziale und Klimasensitivität eingeführter Baumarten in Nordrhein-Westfalen

Zuwachspotenziale und Klimasensitivität eingeführter Baumarten in Nordrhein-Westfalen

Productivity of coastal Douglas-fir and western redcedar in response to species mixture, planting density, and soil carbon:nitrogen ratio

Postglacial climate and fire‐mediated vegetation change on the western Olympic Peninsula, Washington (USA)

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