Sentences with phrase «tree density»

They can then predict whether a severely burned site is likely to meet a desired level of tree density five to seven years later.

With respect to why there was a significant increase in tree density over the past several decades, Dolanc offers that the changes in the density and composition of lower - elevation forests are consistent with fire suppression; but that the density increases in high - elevation vegetation types (subalpine forests generally don't burn) are «more likely to be caused by changing climate.»

While tree density increased by 0.3 percent per year in two decades, liana density rose tenfold.

The highest tree densities, calculated in stems per hectare, were found in the boreal forests of North America, Scandinavia and Russia.

In addition, results from these long - term studies show that early shrub removal and tree density control are the most effective and efficient ways to reduce fuel buildup.

Orange circles indicate plots on terra firme; blue squares, plots on seasonally or permanently flooded terrain (várzea, igapó, swamps); yellow triangles, plots on white - sand podzols; gray circles, plots only used for tree density calculations.

Researchers in the historical Beaver Creek experiments hypothesized that lower tree densities associated with thinning would reduce evapotranspiration losses, and thereby allow more water to be available for soil moisture, groundwater recharge, and surface water runoff [29].

They compared this to the susceptibility to outbreak assuming the forests regenerated homogenously — in other words, if tree density and size did not vary.

«Obviously we expected humans would have a prominent role, but I didn't expect that it would come out as the as the strongest control on tree density.»

The ~ 6 - million - km2 Amazonian lowlands were divided into 1 ° cells, and mean tree density was estimated for each cell by using a loess regression model that included no environmental data but had its basis exclusively in the geographic location of tree plots.

Forest prescriptions for «group - selection» stands called for two post-treatment basal areas, one for «open» areas that would be evenly thinned and another for «group» areas where thinning would be minimal to enhance wildlife habitats by retaining greater tree densities.

In short, tree densities usually plummet as the human population increases.

A scientific consensus has emerged that people mismanaged those particular forests over the past century, in part by suppressing the mild ground fires that used to clear out underbrush and limit tree density.

Much of western North America has elevated tree densities, relative to pre-settlement times, either for all trees, the largest tree classes thereof, or both.

When the U.S. Golf Association hosts the Open, as it will next week in Tulsa, its officials are lords of all they survey, measuring out a heady dose of trouble by adjusting yardage, the rough on the course, and even the density of the trees

For tree density (MXD), such an approach did work and we could therefore use the MXD data even from the root samples.

While the forests are «fire adapted», these areas could be managed to co-exist with human development if lower tree densities were maintained and housing and landscaping were designed for greater fire resistance.

If the average length and intensity of summer drought increases in the Northern Rockies and mountains elsewhere in the western United States, an increased frequency of large wildfires will lead to changes in forest composition and reduced tree densities, thus affecting carbon pools.

Note to the numbers people: a 128 percent increase in tree density, as seen for montane hardwood forests, is a huge greening.

This, in addition to the lowering of other criteria related to tree density and composition, seriously undermines the relevance of the Rainforest Alliance seal for consumers looking for «shade coffee» that is eco-friendly to birds and other diversity.

The SAN Standards and Rainforest Alliance criteria on shade have been slipping continuously since their inception, first removing the tree density per hectare criteria, now relaxing the shade canopy density, even the criteria on number of species, all of which you have discussed in your post.

The researchers documented enormous variability in the tree density, size and growth rates among areas that burned in 1988.

As you can see, they found that tree density was significantly higher (in eight of nine forest types) in the current era of high carbon dioxide, when compared to the early period when concentrations were around 306 ppm, only about 10 percent above the pre-industrial background.

The trees were able to endure such low water potentials and maintain basal levels of metabolism because ecological forcings kept the tree density and leaf area index of the woodland low, physiological factors forced the stomata to close progressively and the trees were able to tap deeper water sources (below 0.6 m) than the grasses.

Humans are absolutely controlling tree densities,» Dr Crowther told BBC News.

High tree densities can thus limit per - tree water and / or light availability, leading to lowered photosynthesis and consequent carbon balance problems that directly affect trees» abilities to defend themselves from predation.