نتایج جستجو برای: forest dieback
تعداد نتایج: 107101 فیلتر نتایج به سال:
Exploring the likelihood and mechanism of a climate-change-induced dieback of the Amazon rainforest.
We examine the evidence for the possibility that 21st-century climate change may cause a large-scale "dieback" or degradation of Amazonian rainforest. We employ a new framework for evaluating the rainfall regime of tropical forests and from this deduce precipitation-based boundaries for current forest viability. We then examine climate simulations by 19 global climate models (GCMs) in this cont...
Dennis J. O’Dowd*, Peter T. Green† and P. S. Lake School of Biological Sciences, PO Box 18, Monash University, Melbourne, Victoria 3800, Australia †Present address: c/-CSIRO, PO Box 780, Atherton, Queensland 4883, Australia *Correspondence: E-mail: [email protected] Abstract Islands can serve as model systems for understanding how biological invasions affect community structure and ecosys...
The projected responses of forest ecosystems to warming and drying associated with twenty-first-century climate change vary widely from resiliency to widespread tree mortality1–3. Current vegetation models lack the ability to account for mortality of overstorey trees during extreme drought owing to uncertainties in mechanisms and thresholds causing mortality4,5. Here we assess the causes of tre...
a recently published article describing the draft genome of erwiniamallotivora bt-mardi (1), the causal pathogen of papaya dieback infection in peninsular malaysia, hassignificant potential to overcome and reduce the effect of this vulnerable crop (2). the authors found that the draft genome sequenceis approximately 4824 kbp and the g+c content of the genomewas 52-54%, which is very similarto t...
Political action can reduce introductions of diseases caused by invasive forest pathogens (IPs) and public support is important for effective prevention. The public's awareness of IP problems and the acceptability of policies aiming to combat these pathogens were surveyed in nine European countries (N = 3469). Although awareness of specific diseases (e.g., ash dieback) varied, problem awareness...
Oak decline as one of the most important environmental problems of Zagros forests, requires proper management to decrease trees dieback and mitigate its effects. This study aimed to find the best sampling method for estimating density and crown canopy of declined oak trees in Zagros Forests. All declined trees in an area of 100 ha of Dinarkooh protected forest were surveyed and trees density, g...
Climate change is expected to cause an increased frequency of extreme events such as heavy floods and major storms. Such stochastic events have an immediate impact on surface water quality, but the long-term effects are largely unknown. In this study, we assess long-term monitoring data from two Swedish headwater catchments affected by extreme weather events. At one site, where nitrogen effects...
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