The Hazards of Interpretation of Static Age Structures as Shown by Stand Reconstructions in a Pinus Contorta -- Picea Engelmannii Forest

Johnson, Edward A.; Miyanishi, Kiyoko; Kleb, Heather R.

doi:10.2307/2261455

Cited by 190 publications

(118 citation statements)

References 26 publications

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“…Both data sets were expressed in 20-year classes. Here it must be noted that: (1) the reconstruction of tree age structures involving the dating of living and dead trees is the result of changes in recruitment and/ or mortality rates (Johnson et al, 1994), and (2) the historical death estimates do not fully account for the individual and temporal variability of actual tree death rates (Zens and Peart, 2003). Mountain pine data were compared with several long-term climate reconstructions, namely (1) annual temperatures for northern Spain based on speleothems (Martín-Chivelet et al, 2011), ), the probability of reproduction equal to 0.5 is reached at an age of 24 years as illustrated by the two arrows.…”

Section: Long-term Recruitment Death and Temperature Patternsmentioning

confidence: 99%

20th Century Climate Warming and Tree-limit Rise in the Southern Scandes of Sweden

Kullman¹

2001

Ambio

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Section: Long-term Recruitment Death and Temperature Patternsmentioning

confidence: 99%

20th Century Climate Warming and Tree-limit Rise in the Southern Scandes of Sweden

Kullman¹

2001

Ambio

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“…Although delayed recruitment of white spruce can occur several decades after a fire (e.g., Fig. 1F; Peters et al 2006), competitive interactions typically constrain later recruits to poor growth and survival in the forest understory for decades to centuries (Johnson et al 1994, Bergeron 2000. Delayed recruitment is thus unlikely to substantively alter the landscape patterns of forest composition we observed at Fox Lake.…”

mentioning

confidence: 91%

A sensitive slope: estimating landscape patterns of forest resilience in a changing climate

et al. 2010

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Abstract. Changes in Earth's environment are expected to stimulate changes in the composition and structure of ecosystems, but it is still unclear how the dynamics of these responses will play out over time. In long-lived forest systems, communities of established individuals may be resistant to respond to directional climate change, but may be highly sensitive to climate effects during the early life stages that follow disturbance. This study combined analyses of pre-fire and post-fire tree composition, environmental data, and tree ring analyses to examine landscape patterns of forest recovery after fire in the south-central Yukon, Canada, a climatically dry region of boreal forest where there is evidence of increasing drought stress. Pre-fire stand composition and age structures indicated that successional trajectories dominated by white spruce (Picea glauca) with little aspen (Populus tremuloides) comprised most of the study area during the last fire cycle. Although spruce seedling recruitment after the fire was highest at sites near unburned seed sources and where surface organic layers were shallow, spruce seedling densities were often insufficient to regenerate the pre-fire spruce forests. In particular, sites in the warmer topographic locations of the valley lowland and south-facing slopes typically had few spruce seedlings and instead were dominated by aspen. The opposite pattern was observed on north-facing slopes. Age reconstructions of pre-and post-fire stands indicate that future canopy composition is driven by initial post-fire recruitment and thus observed landscape differences in seedling recruitment are likely to be maintained through the next 100-200 years of succession. Observed results support the hypothesis that sites experiencing greater environmental stress show the lowest resilience to disturbance, or greatest compositional changes. Analyses of tree-ring responses to climate variables across the same landscape indicate that patterns of tree growth prior to a disturbance may be a useful predictor of landscape variations in forest resilience, allowing managers to better anticipate where future changes in forest composition are likely to occur.Key words: age structure; dendrochronology; equivalent latitude; fire; forest regeneration; landscape ecology; seed dispersal; slope aspect; topography; Yukon.

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“…La distribución de clases diamétricas es función del reclutamiento, el crecimiento y la mortalidad. En rodales no jóvenes y con reclutamiento constante, la distribución de clases diamétricas tiende a adquirir una forma de J invertida debido a una representación desproporcionadamente elevada de individuos pequeños (Weiner, 1988;Johnson et al, 1994;Silvertown y Charlesworth, 2001). En contraste, las distribuciones de diámetros obtenidas para arbustos y para árboles muestran un défi cit marcado de estos individuos con excepción de los arbustos de El Cerezo.…”

Section: Discussionunclassified

“…Por otra parte, la abundancia de la vegetación rasante, el grado de disturbio, la pedregosidad y la carga animal del ecosistema pueden estimarse con análisis de la condición de superfi cie del suelo (del Castillo, 2000). Finalmente, las densidades de plántulas y de plantas muertas en pie junto con la distribución de clases de tamaños de los individuos que conforman las comunidades vegetales pueden ayudar a entender la dinámica de la vegetación (Weiner, 1988;Johnson et al, 1994). Toda esta información es esencial para valorar las condiciones de la vegetación, predecir los efectos de las especies y comunidades ante el cambio climático global y fundamentar científi camente el manejo, la conservación y la restauración de los ecosistemas.…”

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Temperate plant communities in the Sierra Juárez, Oaxaca: altitudinal levels and implications associated with climate change

Zacarías-Eslava¹,

Castillo²

2010

Bot. Sci.

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The Hazards of Interpretation of Static Age Structures as Shown by Stand Reconstructions in a Pinus Contorta -- Picea Engelmannii Forest

Cited by 190 publications

References 26 publications

20th Century Climate Warming and Tree-limit Rise in the Southern Scandes of Sweden

20th Century Climate Warming and Tree-limit Rise in the Southern Scandes of Sweden

A sensitive slope: estimating landscape patterns of forest resilience in a changing climate

Temperate plant communities in the Sierra Juárez, Oaxaca: altitudinal levels and implications associated with climate change

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