Predicting landscape patterns of aspen dieback: mechanisms and knowledge gaps

Frey, Brent R.; Lieffers, Victor J.; Hogg, Edward H.; Landhäusser, Simon M.

doi:10.1139/x04-062

Cited by 186 publications

(171 citation statements)

References 76 publications

Supporting

Mentioning

165

Contrasting

Unclassified

Order By: Relevance

“…Western aspen stands have experienced recent and widespread episodes of mortality, primarily associated with long-term exposure to drought stress, which is likely to be exacerbated by future climate change [46,47]. This phenomenon, commonly referred to as sudden aspen decline (SAD), leads to the death of apparently healthy aspen stands in 3-6 years [48,49]. During a 1 year period from 2005 to 2006, the San Juan National Forest in Colorado experienced a 58% increase in area of recent aspen mortality [50].…”

Section: (C) Above-and Below-ground Linkages In Aspen Forestsmentioning

confidence: 99%

Imaging spectroscopy links aspen genotype with below-ground processes at landscape scales

Madritch

Kingdon²,

Singh³

et al. 2014

Phil. Trans. R. Soc. B

View full text Add to dashboard Cite

Fine-scale biodiversity is increasingly recognized as important to ecosystemlevel processes. Remote sensing technologies have great potential to estimate both biodiversity and ecosystem function over large spatial scales. Here, we demonstrate the capacity of imaging spectroscopy to discriminate among genotypes of Populus tremuloides (trembling aspen), one of the most genetically diverse and widespread forest species in North America. We combine imaging spectroscopy (AVIRIS) data with genetic, phytochemical, microbial and biogeochemical data to determine how intraspecific plant genetic variation influences below-ground processes at landscape scales. We demonstrate that both canopy chemistry and below-ground processes vary over large spatial scales (continental) according to aspen genotype. Imaging spectrometer data distinguish aspen genotypes through variation in canopy spectral signature. In addition, foliar spectral variation correlates well with variation in canopy chemistry, especially condensed tannins. Variation in aspen canopy chemistry, in turn, is correlated with variation in below-ground processes. Variation in spectra also correlates well with variation in soil traits. These findings indicate that forest tree species can create spatial mosaics of ecosystem functioning across large spatial scales and that these patterns can be quantified via remote sensing techniques. Moreover, they demonstrate the utility of using optical properties as proxies for fine-scale measurements of biodiversity over large spatial scales.

show abstract

Section: (C) Above-and Below-ground Linkages In Aspen Forestsmentioning

confidence: 99%

Imaging spectroscopy links aspen genotype with below-ground processes at landscape scales

Madritch

Kingdon²,

Singh³

et al. 2014

Phil. Trans. R. Soc. B

View full text Add to dashboard Cite

show abstract

“…A clonal pattern was even shown for aspen decline [72]. Differential responses of tree species or genotypes to water deficit and pathogens may explain such patterns [164].…”

Section: Species-specific and Genetic Effectsmentioning

confidence: 99%

“…This spiral model has been widely used to analyse a number of decline situations. Drought has very often been considered as an inciting factor and root pathogens, such as Armillaria, as contributing factors [72,145,146]. The role of pathogens as predisposing or triggering agents of decline diseases has also been recognised, especially powdery mildew and Phytophthora spp.…”

Section: Interaction Effects: Drought and Infection Acting As Multiplmentioning

confidence: 99%

Interactive effects of drought and pathogens in forest trees

et al. 2006

View full text Add to dashboard Cite

-This review synthesizes the available knowledge on drought-disease interactions in forest trees with a focus on (1) evidence and patterns of drought-disease interactions, (2) current understanding of processes and mechanisms, and (3) three well documented cases studies. The first part is based on the analysis of a database of slightly more than one hundred studies, obtained by keyword searches combining drought, diseases or pathogens, and forest trees. A large majority of published studies referred to a positive association between drought and disease, i.e. disease favoured by drought or drought and disease acting synergistically on tree health status, with a predominance of canker/dieback diseases, caused by pathogens like Botryosphaeria, Sphaeropsis, Cytospora and Biscognauxia (Hypoxylon). The type of disease-related variables (incidence vs. severity) and the intensity and timing of water stress were shown to be significant factors affecting the drought-infection interaction. Interactions with other abiotic stresses and species-specific and genetic effects, related to host or pathogen, have also been reported. Direct effects of drought on pathogens are generally negative, although most fungal pathogens exhibit an important plasticity and can grow at water potentials well below the minimum for growth of their host plants. Studies on indirect effects of drought on pathogens through other community interactions are still relatively scarce. Positive drought-infection effects can mostly be explained by indirect effects of drought on host physiology. The predisposition and the multiple stress hypotheses are presented, as well as recent developments in the study of the molecular basis of abiotic and biotic stress, and their interactions. Sphaeropsis sapinea on pines, Biscognauxia mediterranea on oaks and root pathogens in declines associated with drought provide illustrative examples, treated as case studies, of pathogens of current significance associated with drought. The conclusion highlights some knowledge gaps, e.g. the role of latent parasites and the shift to a pathogenic stage, or the genetics of some fungal groups. The need for prevention of pathogen dispersal, especially crucial in the case of latent pathogens, is emphasized. drought / water stress / pathogenic fungi / predisposition / forest trees Résumé -Interactions entre sécheresse et agents pathogènes chez les arbres forestiers. Cette revue synthétise les connaissances actuelles sur les interactions entre sécheresse et maladies chez les arbres forestiers, avec trois grandes parties : (1) description des types d'interaction ; (2) connaissances acquises sur les mécanismes impliqués ; (3) trois études de cas bien étudiées. La première partie est basée sur l'analyse d'une base de données d'une centaine d'études, sélectionnées par recherche sur mots clés. La plupart de ces études se rapportent à des maladies favorisées par la sécheresse ou à un effet synergique entre sécheresse et maladie sur l'état sanitaire des arbres, avec une prédominance de m...

show abstract

“…Recent research indicates that quaking aspen dieback in multiple regions in North America is the result of drought stress and various secondary factors, including insect and fungal infestations (Frey et al 2004, Worrall 2013. Increasing temperatures and decreasing growing season precipitation resulted in decreased suitable habitat, especially in marginal areas such as shallow soils over bedrock.…”

Section: Species Range and Critical Loadmentioning

confidence: 99%

How climatic conditions, site, and soil characteristics affect tree growth and critical loads of nitrogen for northeastern tree species

Robin-Abbott¹,

Pardo²

2017

View full text Add to dashboard Cite

Forest health is affected by multiple factors, including topography, climate, and soil characteristics, as well as pests, pathogens, competitive interactions, and anthropogenic deposition. Species within a stand may respond differently to site factors depending on their physiological requirements for growth, survival, and regeneration. We determined optimal ranges of topographic (elevation, aspect, slope gradient), climatic (average temperature

show abstract

Predicting landscape patterns of aspen dieback: mechanisms and knowledge gaps

Cited by 186 publications

References 76 publications

Imaging spectroscopy links aspen genotype with below-ground processes at landscape scales

Imaging spectroscopy links aspen genotype with below-ground processes at landscape scales

Interactive effects of drought and pathogens in forest trees

How climatic conditions, site, and soil characteristics affect tree growth and critical loads of nitrogen for northeastern tree species

Contact Info

Product

Resources

About