tree sample News
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Stenospermocarpic fruit linked to unmarketable black walnuts
Black walnut (Juglans nigra L.) is native to much of the eastern United States and is highly valued for its nuts and timber. Black walnut fruit generally reach most of their size by mid-August and mature by late September or early October. The fruit are then harvested, hulled, and dried in-shell before cracking for commercial markets. Walnut growers use the term "ambers" to describe poorly ...
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Careful urban tree planting and pruning needed to reduce trapping of air pollution
Careful planting and pruning is needed to ensure that air pollution in tree-lined streets is minimised, new research suggests. While planting trees in urban areas can have many benefits, such as enhancing biodiversity, trees can trap particulate matter pollution, say the study’s authors. Particulate matter (PM) air pollution is a component of vehicle exhaust emissions and PM2.5 (particles ...
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Polluted urban soil damages lime trees
The impact of polluted urban soil on trees is highlighted in a recent study from Latvia. The researchers found that high salt levels from de-icing chemicals and nutrient imbalance in soil damaged lime trees growing in the city of Riga. Trees planted in cities are an important part of the urban landscape, providing a range of benefits, from enhancing biodiversity to promoting a feeling of ...
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Selective breeding could save trees from drought
Trees with high wood density tend to survive better under drought conditions. In a new study on Douglas-fir tree populations, research suggests that the trees could be selectively bred for high density wood to increase resistance to drought. With predictions that the frequency of droughts could increase over the coming century, such strategies to protect tree populations could aid climate change ...
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Growth-oriented logging: a new concept in forest management
Deforestation in the tropics has both local and global effects, but conservation remains a major challenge. New research describes a method for measuring tree growth and timber harvesting, which can lead to sustainable management of tropical timber resources. The method tailors cutting cycles according to accurate growth rates of different tree species. Research explored the Mamirauá Sustainable ...
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