Variable retention harvesting (VRH) has been proposed as a silvicultural practice to maintain biodiversity and ecosystem integrity. No previous study has examined tree carbon isotope discrimination to provide insights into water stress that could lead to dieback and mortality of trees following VRH. We measured and compared the carbon isotope ratios (delta(13)C) in stem wood of trembling aspen ...

Drought-induced, regional-scale dieback of forests has emerged as a global concern that is expected to escalate under model projections of climate change. Since 2000, drought of unusual severity, extent, and duration has affected large areas of western North America, leading to regional-scale dieback of forests in the southwestern US. We report on drought impacts on forests in a region farther ...

Oak decline is a chronic problem in Missouri Ozark forests. Red oak group species are most susceptible and decline is reportedly more severe on droughty, nutrient-poor sites. However, it was not clear whether greater decline severity was caused by poor site conditions or is simply due to the greater abundance of red oak group species found on poorer sites. We conducted this study to determine w...

Ash dieback (Hymenoscyphus fraxineus) is a fungal disease which affects ash throughout Sweden. Monitoring to study of the impact on veteran trees was undertaken in southwest Sweden 2009, 2011, 2013, 2015, and 2020. The found that 94.5% observed were affected by 2020 compared with 62% 2009. 70 studied have died (21%) since monitoring began. In 2009 there no relationship between girth dieback, bu...

Ailanthus altissima is an invasive alien species in Europe. Biological control of this tree by Verticillium nonalfalfae a potential alternative approach. This study investigates host specificity, pathogenicity and transmission V. to neighbouring plants with root contact mini-ecosystems. led dieback all inoculated trees. Furthermore, was transmitted trees, causing wilt dieback, and, one case, Qu...

a large collection of botryosphaeriaceae isolates obtained from fruit and forest trees with fruit rot, canker and dieback disease symptoms in northern provinces of the country were examined in this study. based on morphology and sequence data (its and ef1-α), two species, diplodia mutila and spencermartinsia viticola are illustrated and described as new records for iran mycobiota. furthermore, ...

Species distribution models (SDMs) are an effective way of predicting the potential distribution of species and their response to environmental change. Most SDMs apply presence data to a relatively generic set of predictive variables such as climate. However, this weakens the modelling process by overlooking the responses to more cryptic predictive variables. In this paper we demonstrate a mean...

0378-1127/$ see front matter Published by Elsevier http://dx.doi.org/10.1016/j.foreco.2012.08.049 ⇑ Corresponding author. Tel.: +1 814 563 1040; fax E-mail address: [email protected] (A.A. Royo). Over the past century, white ash (Fraxinus americana) populations throughout its range have deteriorated as a result of declining tree health and increased mortality rates. Although co-occurring factors ...