Quantcast

Scientists Find Plants Are Growing Higher up the Himalayas

Science
Ama Dablam mountain of the Himalayan mountains. Rohit Tandon / Unsplash

Researchers have found that plants are growing farther up the Himalayas than they did in the past, according to a new study in the journal Global Change Biology, as Newsweek reported.


Researchers looked at satellite data from 1993 to 2018 and found plant life extending into the harsh terrain between the top of the tree line and the bottom of the snowline. The new growth may have large impacts on the water that feeds the rivers that flow down from the Himalayas, according to lead researcher, Karen Anderson, of the University of Exeter in the UK.

"If the ecology is changing, that will have impacts on the hydrology. Nobody's considered that before," she said, as the New Scientist reported.

That's significant since nearly 1.4 billion people rely on water from the Himalayas, according to The Telegraph.

Anderson and her team looked at 25 years of images from NASA's Landsat satellites to zero in on the subnival region - the area between the tree line (the edge of where trees can grow) and the snow line (the boundary between permanently snow-covered land and snow-free land), as BBC reported. The rocky, cold terrain that is over 4,500 meters (13,600 feet) above sea level is particularly inhospitable to most plants, meaning the vegetation is mostly shrubs and grasses.

The subnival region is also very large, extending five to 15 times the size of the landmass covered in snow and ice, according to the study. "Yet, the harsh conditions make the area difficult to study. There's hardly any ecological data from this region at all," said Anderson, as the New Scientist reported.

For this paper, Anderson and her team focused on three sections of the Hindu Kush Himalaya, a range that stretches from Afghanistan in the west to Myanmar in the east, as Newsweek reported.

"The strongest trend in increased vegetation cover was between 5,000 meters and 5,500 meters altitude," said Anderson, as BBC reported. "At higher elevations, the expansion was strong on flatter areas while at lower levels that has been observed on steeper slopes."

There is no definitive reason that plants are moving to higher elevations, but the climate crisis is a likely culprit. "My initial guess would be that the primary driver is temperature limitation being removed," said Anderson to the New Scientist. She added that extra carbon dioxide in the atmosphere could also be helping the plants grow.

The climate crisis is dramatically affecting the Himalayas, which are warming rapidly due to greenhouse gas emissions. That has meant that elevations that were once too cold for plants may now be hospitable to them, as the New Scientist reported.

Already, concern has grown over the Himalayas' melting glaciers and how it will alter borders between countries. Furthermore, the melting glaciers will wreak havoc on the water supplies of countries that rely on runoff, causing an increase in floods and droughts.

Water that runs from the Himalayas feeds the 10 largest rivers in Asia, and 250 million rely on water from the range's glaciers, which are threatened by global warming, as the Telegraph reported. If global warming is somehow held to 1.5 degrees Celsius above pre-industrial levels, then one-third of the Himalayan ice caps will still melt away.

Anderson told the New Scientist that it is crucial to figure out how the new vegetation climbing the mountains will affect the flow of water. Plant growth may trap more heat, causing the snow to melt faster.

"The plants could trap more snow. Or the plants could warm the areas nearby through albedo effects, causing the snow to melt at a different rate," she said, as the Telegraph reported.

EcoWatch Daily Newsletter

A harbour seal on an ice floe in Glacier Bay, Alaska. A new study shows that the climate crisis has warmed waters, changing ecosystems and crippling sea ice growth. Janette Hill / robertharding / Getty Images Plus

The climate crisis is accelerating the rate of change in Alaska's marine ecosystem far faster than scientists had previously thought, causing possibly irreversible changes, according to new research, as Newsweek reported.

Read More
Doctors report that only 1 in 4 children are getting the recommended 60 minutes of physical activity per day. Ronnie Kaufman / DigitalVision / Getty Images

By Dan Gray

Pediatricians are being urged to start writing "exercise prescriptions" for the children they see in their office.

Read More
Sponsored
A First Nations protester walks in front of a train blockade in Tyendinaga, near Belleville, Ontario, Canada on Feb. 21, 2020. LARS HAGBERG / AFP via Getty Images

An indigenous rail blockade that snarled train travel in Canada for more than two weeks came to an end Monday when police moved in to clear protesters acting in solidarity with another indigenous community in British Columbia (B.C.), which is fighting to keep a natural gas pipeline off its land.

Read More
A rainbow snake, a rare reptile spotted in a Florida county for the first time in more than 50 years, seen here on July 5, 2013. Kevin Enge / FWC Fish and Wildlife Research Institute / Flickr

A Florida hiker recently stumbled across a slithering surprise — a rare snake that hadn't been spotted in the area for more than 50 years.

Read More
We need our government to do everything it can to stop PFAS contamination and exposure from wreaking havoc in communities across the country. LuAnn Hun / Unsplash

By Genna Reed

The EPA announced last week that it is issuing a preliminary regulatory determination for public comment to set an enforceable drinking water standard to two of the most common and well-studied PFAS, PFOA and PFOS.

This decision is based on three criteria:

  1. PFOA and PFOS have an adverse effect on public health
  2. PFOA and PFOS occur in drinking water often enough and at levels of public health concern;
  3. regulation of PFOA and PFOS is a meaningful opportunity for reducing the health risk to those served by public water systems.
Read More