Category: forests

Global warming hampers post-fire forest regrowth in Colorado

‘We are seeing the initiation of a retreat of forests to higher elevations’

A June, 2011 wildfire in Keystone Gulch burned within a few hundred feet of vacation homes and full-time residences at the Colorado resort.
A June, 2011 wildfire in Keystone Gulch burned within a few hundred feet of vacation homes and full-time residences at the Colorado resort. @bberwyn photo.

Staff Report

Global warming is likely one of the main factors that’s preventing some Colorado forests from regenerating after wildfires.

When they started studying eight wildfire sites that burned across 162,000 acres of low-elevation forests along the Front Range, University of Colorado Boulder researchers said they expected to see young trees popping up all over the place, but that’s not what they found.

There were no seedlings at all in 59 percent of the study plots and 83 percent showed a very low density of seedlings. Future warming and associated drought may hinder significant further recovery, the researchers concluded. Only 2 to 38 percent of plots surveyed, depending on the fire site, were considered stocked, or on their way to recovery. Continue reading “Global warming hampers post-fire forest regrowth in Colorado”

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Spruce beetles still on the march in Colorado

Global warming taking a toll on forests worldwide

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Aerial surveys help track the health of Colorado forests. @bberwyn photo.

By Bob Berwyn

Spruce beetles continued to expand in Colorado in 2016, at least in part due to global warming and drought, as well as the density of old-growth spruce forests.

In all, spruce beetles were active across 350,000 acres of higher-elevation stands of Engelmann spruce statewide, including about 136,000 acres of new activity, causing widespread tree mortality, according to the results of the latest aerial surveys conducted by the U.S. Forest Service and the Colorado State Forest Service. Since 1996, spruce beetle outbreaks have caused tree mortality on more than 1.7 million acres in Colorado. Continue reading “Spruce beetles still on the march in Colorado”

Sunday set: Euro-shrooms

Fantastic fungi

One of the coolest things about mushrooms is that many species are true globalists, which means they grow in many different countries, on many different continents, wherever habitat and moisture are present in the right combination. The fungi in this set were all photographed in the forests of Austria this summer, but all these varieties — either the exact same species or close relatives, — also grow in North America. Check the Summit Voice mushroom archives for more fungi photography, as well as some of the latest stories on mushroom ecology. We’re starting to learn that the delicate relationship between fungi, forests, plants and soil has a huge influence on the global carbon cycle.

Massive forest death continues in California

Latest survey tallies more than 100 milion dead trees

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A stand of pine-beetle killed lodgepole pines on the White River National Forest. @bberwyn photo.

Staff Report

California’s long-term drought has claimed another 36 million trees, the U.S. Forest Service said this week, announcing the results of a new aerial survey. Since 2010, more than 100 million trees have died across 7.7 million acres, the agency said.

The die-off intensified in 2016, after four years of drought,  with mortality increasing 100 percent. Millions of additional trees are weakened and expected to die in the coming months and years. Forest Service leaders once again emphasized that their ability to address safety issues linked with dead trees has been severely hampered by climate change and limited resources.

Agriculture Secretary Tom Vilsack said a broken budget for the Forest Service sees an increasing amount of resources going to firefighting while less is invested in restoration and forest health.  Continue reading “Massive forest death continues in California”

Sunday set: Wienerwald

The lungs of a city …

All mountain ranges have to end somewhere, and for the Alps, the eastern terminus is the Wienerwald, a chain of rolling, low-slung hills on the outskirts of Vienna that drop down to the Danube Basin along a tectonic escarpment marked by a series of hot- and cold-water springs. It’s a geological and biological transition zone, where the rather moist and cool climate of northwestern Europe gives way to the drier regime of the Pannonian Basin to the southeast, including the Hungarian Puszta. Continue reading “Sunday set: Wienerwald”

How will boreal forests respond to global warming?

New satellite data helps track photosynthesis in evergreens

How will forests respond to global warming? @bberwyn photo.
An aerial photo of forests in western Colorado. New satellite data will help show how evergreen forests are responding to climate change. @bberwyn photo.

Staff Report

Despite the huge importance of forests in the global carbon cycle, researchers still aren’t exactly certain how they will respond to climate change. But that could soon change thanks to satellite sensors that can track photosynthesis in evergreen forests by monitoring slight color shifts.

The new information could help assess the health of northern forests over time, showing how they are responding to global warming. Photosynthesis is easy to track in deciduous trees — when leaves bud or turn yellow and fall off. But until recently, it had been impossible to detect in evergreen conifers on a large scale. Continue reading “How will boreal forests respond to global warming?”

The lungs of the Earth

Study eyes forest ecosystem tipping points that can drive climate change

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The tipping point of forest ecosystems can, in turn, drive climate change by altering the global carbon cycle. @bberwyn photo.

Staff Report

Tropical forests are the Earth’s lungs, helping drive global respiration and transpiration – key steps in the climate cycle. That’s been the case for millennia, according to a University of California, Davis-led study that tracked atmospheric CO2 levels from 330 to 260 million years ago by examining fossilized leaves and soil-formed minerals.

The last time Earth experienced both ice sheets and carbon dioxide levels within the range predicted for this century was a period of major sea level rise, melting ice sheets and upheaval of tropical forests, where dramatically dynamic forest regeneration cycles were a big factor in driving the climate between warmer and cooler phases. Continue reading “The lungs of the Earth”