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.
Latest survey tallies more than 100 milion dead trees
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.
Study suggests carbon uptake by forests has doubled since the 1950s
Scientists say they’ve place yet another piece in the complex global plant-carbon cycle, with a new study suggested that atmospheric CO2 levels have plateaued in recent years because forests and grasslands are removing more of the heat-trapping gas. The research was led by a scientist with the Department of Energy’s Lawrence Berkeley National Laboratory .
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”→
New satellite data helps track photosynthesis in evergreens
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?”→
Danube Pano from Aggstein Castle looking across at Willendorf.
Most travelers have heard of the Wachau region. The fertile hillsides along the Danube River have long been designated as a World Heritage region for its cultural and natural landscapes. But just across the river is another slice of forest, the Dunkelsteinerwald, that’s not quite as famous but just as beautiful. On a mid-October weekend, we hiked from the pilgrimage town of Maria Langegg up the restored Aggstein Castle, which was built in the 12th century. Like many others along the Danube, the castle was an outpost for charging toll to passing ships, a payment made in exchange for maintaining the paths along the shore that were used to tow ships upstream. But the area was inhabited long before that, with signs of civilization dating back to the Celtic era — and long before. Just across the river, construction workers in 1908 unearthed the famed Venus of Willendorf, a prehistoric fertility figurine dating back to about 25,000 BC.
Commercially valuable tree stands take hit in Pacific Northwest
Global warming may be a factor in the spread of a fungus affecting valuable Douglas fir forests in the Pacific Northwest. Needle cast disease has recently spread across 590,000 acres in Oregon, quadrupling since the start of surveys in 1996. The annual economic loss has been estimated at $128 million.
“The correlation between disease severity and climate factors, such as spring moisture and warm winter temperatures, raises the question of a link between disease expansion and climate change,” said researcher Gabriela Ritokova. “Those factors, in combination with lots of Douglas fir and with large springtime fungal spore production, have us where we are now.” Continue reading “Climate change may be factor in spread of tree fungus”→