Biotic and abiotic factors affecting the dying back of pedunculate oak Quercus robur L.

Gibbs, J. N.; Greig, B. J. W.

doi:10.1093/forestry/70.4.399

Cited by 55 publications

(45 citation statements)

References 9 publications

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“…Finally, Sheen wood had the highest proportion of AOD-affected trees and the highest co-occurrence on individual trees, but no clustering could be detected. This site is a long-affected site, with symptoms first documented in 1991 [67], therefore AOD is more established and widespread. This can be seen in the simulation envelopes for the O-ring function which centre around 0.5 and reflect the fact that a high degree of clustering is expected under randomly generated patterns.…”

Section: Discussionmentioning

confidence: 99%

Acute Oak Decline and Agrilus biguttatus: The Co-Occurrence of Stem Bleeding and D-Shaped Emergence Holes in Great Britain

Brown

Jeger

Kirk

et al. 2017

Forests

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Acute Oak Decline (AOD) is a new condition affecting both species of native oak, Quercus robur and Quercus petraea, in Great Britain. The decline is characterised by a distinctive set of externally visible stem symptoms; bark cracks that "weep" dark exudate are found above necrotic lesions in the inner bark. Emergence holes of the buprestid beetle, Agrilus biguttatus are often also seen on the stems of oak within affected woodlands. This investigation assesses the extent to which the external symptoms of these two agents co-occur and reveals the spatial and temporal patterns present in affected woodland. Annual monitoring in eight affected woodlands showed that stem bleeding and emergence holes frequently occur on the same trees, with new emergence holes significantly more likely to occur when trees already have stem bleeds. Trials with coloured prism traps confirm A. biguttatus was present at all experimental sites. Beetle emergence is linked primarily to a few heavily declining trees, indicating that susceptibility may vary between hosts and that those with reduced health may be predisposed to AOD. Stem bleeds occur on trees in close proximity to the locations of trees with exit holes.

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Section: Discussionmentioning

confidence: 99%

Acute Oak Decline and Agrilus biguttatus: The Co-Occurrence of Stem Bleeding and D-Shaped Emergence Holes in Great Britain

Brown

Jeger

Kirk

et al. 2017

Forests

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“…5; Table 3) in all vigour classes, the narrow tree rings can be coupled with dry growing seasons and poor plant-water relations overall (Thomas and Hartmann, 1998). Summer droughts have been suggested as a contributing decline factor of oak in Poland (Siwecki and Ufnalski, 1998), in combination with exceptional winter frosts in Great Britain (Gibbs and Greig, 1997) and Germany (Hartmann et al, 1989). The geographically closest study to Finland derives from southern Sweden, where Drobyshev et al (2007b) have suggested that the peak in oak mortality around the year 2000 was triggered by the spring and summer drought that occurred already in 1992.…”

Section: Summer Precipitation Signalmentioning

confidence: 99%

“…Thus, the reasons are related with several biotic and abiotic factors, and are frequently a combination of different severe determinants (e.g. Wargo, 1996;Gibbs and Greig, 1997;Thomas et al, 2002), partly with site-specific causes (Jung et al, 2000;Jönsson et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Oak decline in a southern Finnish forest as affected by a drought sequence

Sohar

Helama²,

Läänelaid

et al. 2013

Geochronometria

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Abstract:We investigated the decline of a pedunculate oak (Quercus robur L.) forest growing on shallow soil at the northern distributional limit of the species in southern Finland, using the dendroclimatic approach. About 200-year-old trees in three vigour classes -healthy, declining and deadwere sampled in 2008. Annual tree-ring, earlywood and latewood widths were measured and chronologies were established. The tree-ring data were correlated with monthly and seasonal climate data. Radial increment of oaks was positively related to the June and July precipitations. This was expressed especially in total ring width and latewood width, whereas the earlywood was more influenced by the warmer winter and spring. Furthermore, the correlation between the current year earlywood width and the preceding year latewood width was higher than between the earlywood and latewood of the same year. The analyses showed that the dead oaks and part of the declining oaks had ceased growing during 2005-2007 after a decade-long summer drought series. This indicates a time lag in the oak dieback. The radial growth of the declining and the dead oaks had dropped already since the 1990s, while the healthy oaks had better long-term growth and higher adaptive capacity to climate variation.

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“…While Quercus species are believed to show high competitiveness under drier conditions than currently experienced in southern England (Abrams 1990, Broadmeadow et al 2005, Eilmann et al 2006, Thomas et al (2002) found that a combination of waterlogging in winter and summer drought weakens oak to a level where diseases can attack more readily. Cases of drought-induced mortality have also been reported in Europe (Dreyer 1994, Brasier 1996, Gibbs & Greig 1997, Allen et al 2010. Modelled results presented by Attorre et al (2008) suggest that the general assumption regarding drought sensitivity is invalid; instead, the performance of oak is dependent on origin and the characteristics of individual species.…”

Section: Introductionmentioning

confidence: 99%

Species-specific climate response of oaks (Quercus spp.) under identical environmental conditions

Sanders¹,

Pitman²,

Broadmeadow³

2014

iForest

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© iForest -Biogeosciences and Forestry IntroductionAn increase in pest and disease outbreaks as well as projected climate warming constitutes a serious threat to forestry over the coming decades (Bolte et al. 2009, Sturrock et al. 2011. As a consequence of these impacts, individually or in combination, tree vitality and survival may decline resulting in reduced productivity (Leuzinger et al. 2005). The resilience of species to biotic and abiotic stresses, as well as their adaptation potential to changing environmental conditions, is important knowledge to guide sustainable forest management (Arend et al. 2011). Oak comprises the highest percentage of broadleaved woodland in Great Britain but its yield is expected to decline in the south and east under future climate projections (Broadmeadow et al. 2005). These forests possess a high economic and socio-economic value (Evans 1984, Grant & Edwards 2008, raising the question as to whether replacement with another oak species, better adapted to summer drought and wet winters, is an appropriate response to projected climate change. While Quercus species are believed to show high competitiveness under drier conditions than currently experienced in southern England (Abrams 1990, Broadmeadow et al. 2005, Eilmann et al. 2006, Thomas et al. (2002) found that a combination of waterlogging in winter and summer drought weakens oak to a level where diseases can attack more readily. Cases of drought-induced mortality have also been reported in Europe (Dreyer 1994, Brasier 1996, Gibbs & Greig 1997, Allen et al. 2010. Modelled results presented by Attorre et al. (2008) suggest that the general assumption regarding drought sensitivity is invalid; instead, the performance of oak is dependent on origin and the characteristics of individual species. Other authors attribute the decline of oak in Europe to a combination of several factors, including infection by Phytophthora cinnamomi exacerbated by climatic factors (Brasier & Scott 1994). Thomas & Blank (1996) propose nutrient imbalance as the reason for oak decline, while Andersson et al. (2011) concluded that the decline of oak and its inevitable death is a long process which can begin decades previously.Tree ring analysis can be used to better understand the potential for an onset of decline driven by responses to climate (Schweingruber 1988(Schweingruber , 1990. Despite age and management-related variation in growth, the sensitivity of a species on a given site to environmental changes can be assessed (Friedrichs et al. 2009). Tree-ring analysis is regularly used to evaluate climate-growth interactions as well as establishing the drivers for tree mortality (Cook et al. 1987). While site conditions modulate climate-growth correlations (Wilson et al. 2008) information on species-specific climate responses still can be derived (Carrer 2011, Sanders et al. 2012. This approach was the subject of a number of dendrochronological studies (Leblanc & Foster 1992, Dwyer et al. 1995, Eilmann et al. 2006, Danek et al. 2007, Friedrichs et al. 2...

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Biotic and abiotic factors affecting the dying back of pedunculate oak Quercus robur L.

Cited by 55 publications

References 9 publications

Acute Oak Decline and Agrilus biguttatus: The Co-Occurrence of Stem Bleeding and D-Shaped Emergence Holes in Great Britain

Acute Oak Decline and Agrilus biguttatus: The Co-Occurrence of Stem Bleeding and D-Shaped Emergence Holes in Great Britain

Oak decline in a southern Finnish forest as affected by a drought sequence

Species-specific climate response of oaks (Quercus spp.) under identical environmental conditions

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