Wednesday, March 29, 2023
Green Reporter
  • Home
  • Biodiversity
  • Climate Change
  • Energy
  • Filmmaking
  • Food
  • Investment
  • Management
  • Sustainability
  • Technology
  • Transportation
No Result
View All Result
  • Home
  • Biodiversity
  • Climate Change
  • Energy
  • Filmmaking
  • Food
  • Investment
  • Management
  • Sustainability
  • Technology
  • Transportation
No Result
View All Result
Green Reporter
No Result
View All Result
Home Biodiversity

Intensive Water Management in California Imperils Biodiversity in Floodplain Forests | UCSB

GrR by GrR
June 21, 2021
in Biodiversity
0
Intensive Water Management in California Imperils Biodiversity in Floodplain Forests | UCSB
56
SHARES
243
VIEWS
Share on FacebookShare on Twitter


Riparian community woodlands along the lower Tuolumne River near Merced, California.
Click to view larger

Riparian community woodlands along the lower Tuolumne River near Merced, California. (John Stella, ESF)

Woodlands along streams and rivers are an important part of California’s diverse ecology. They are biodiversity hotspots, providing various ecosystem services including carbon sequestration and critical habitat for threatened and endangered species.

But our land and water use have significantly impacted these ecosystems, sometimes in unexpected ways.

A team of researchers, including two at UC Santa Barbara, discovered that some riparian woodlands are benefiting from water that humans divert for our own needs. Although it seems like a boon to these ecosystems, the artificial supply of water begets an unintended dependence on this bounty, threatening the long-term survival of natural forest communities.

The paper, published in the Proceedings of the National Academy of Sciences, spotlights the need for changes in the way water is managed across the state.

“We need to be more intentional in incorporating ecosystem water needs when we manage water — both for aquatic organisms and species on land,” said lead author Melissa Rohde, a groundwater scientist at The Nature Conservancy who led the research as a doctoral student at State University of New York College of Environmental Science and Forestry (SUNY-ESF).

“These forest ecosystems are in a precarious state because we have disrupted the natural hydrologic processes that these plant species rely upon to support and sustain key life processes,” she said.

In California’s Mediterranean climate, plants and animals have adapted to rely on precipitation and soil moisture recharge during the rainy winter and spring seasons for reproduction and growth during the typically dry summers.

Once soil moisture is exhausted, tree species often found in stream corridors, such as willows, cottonwoods and oaks, typically use deeper groundwater. However, the researchers discovered the story was more complicated.

By analyzing five years of vegetation greenness data from satellite imagery, the authors found that in some cases, these ecosystems were affected by “subsidies of water” delivered via human regulation of rivers, agricultural canals and discharges from wastewater treatment plants.

Altered streamside woodlands in the most arid regions of the state stayed greener longer into the dry season and were less responsive to changes in groundwater levels than natural ecosystems.

“Although this seems like a good news story — trees benefit from anthropogenic water management — there is an important caveat,” said co-author Michael Singer, a researcher at UCSB’s Earth Research Institute and a professor at Cardiff University in the United Kingdom.

“In channels and canals with severely altered flow regimes, there are few if any opportunities for these trees to spawn new offspring,” Singer said. “This means that once these riparian woodlands die off, they will not be replaced through forest succession.”

Many of the most-altered stream ecosystems are in California’s Central Valley, the state’s agricultural hub, which produces a third of the produce for the U.S. Following the Gold Rush in the 1850s, massive human settlement led to clearing of 95% of the natural floodplain woodlands across the region.

These isolated and restricted riparian, or streamside, forests now provide important habitat for threatened and endangered species like the California red-legged frog, Chinook salmon and Swainson’s hawk.

As water is rerouted from rivers into canals to accommodate urbanization and the multibillion-dollar agricultural industry, it creates an artificially stable environment for riparian woodland ecosystems. This encourages a “live fast, die young” community that favors trees that peak and then decline within a few decades.

Key ecosystem functions — such as the regeneration of new forest stands and their development over time — are being compromised by the extensive alterations to streamflow and to river channels, which are fixed in place and no longer create new floodplain areas where young trees can establish.

“We call these forests the ‘living dead’ because the forest floor is devoid of saplings and younger trees that can replace the mature trees when they die,” Rohde said. This has repercussions related to habitat for endangered species, biodiversity, carbon sequestration, and climate change.

“California is one of the most biodiverse regions in the world, containing more species than the rest of the United States and Canada combined,” said Rohde. “In the midst of the sixth mass extinction, the long-term sustainability of California’s river ecosystems and the preservation of the rare and endemic species that live within them now rely on the deliberate, coordinated management of resource and government agencies.”

This study is part of a $2.5 million suite of projects that the collaborators at SUNY-ESF, UCSB and Cardiff University have funded throughout the U.S. Southwest and France. The investigators also include UCSB geography professor Dar Roberts, one of the study’s co-authors.

The goal is to develop water stress indicators for dryland riparian forest ecosystems threatened by climate change and increasing human water demand.

Rhode and The Nature Conservancy will use the insights from the study to provide scientific guidance to California natural resource agencies for sustainably managing groundwater-dependent ecosystems throughout the state. As Singer pointed out, the findings pertain to the recent sustainable groundwater legislation passed in California.

The Sustainable Groundwater Management Act requires all groundwater stakeholders to agree on sustainability targets for groundwater usage to support urban areas, agriculture, industry and ecology.

The research team used publicly available online data and Google Earth Engine, an open-source tool for analyzing data from satellites and other global spatial datasets.

“Our methods and findings open up a whole new world of interdisciplinary research possibilities and ways that water practitioners can consider ecosystem water needs to achieve sustainable water management,” Rohde said.

John Stella, a SUNY-ESF professor and principal investigator on the National Science Foundation grant that funded the study, characterized the work as “groundbreaking” for the way it “combined several big datasets in an innovative way to understand how climate and water management interact to put these sensitive ecosystems at risk.”

“[The] findings are important for sustainably managing groundwater, not only throughout California, but in water-limited regions worldwide,” Stella said. “By creatively harnessing and integrating these large environmental datasets, we can now answer resource management questions at a scale that was previously impossible.”





Source link

Previous Post

SIT Student Film Wins Category In International Film Festival

Next Post

Importance of sustainable grain production | Farm Weekly

GrR

GrR

Green Reporter is a global source for news of sustainability, green industry, green technology, clear energy, sustainable food production, and green investments. Our aim is to deliver the best news and information to you.

Next Post
Importance of sustainable grain production | Farm Weekly

Importance of sustainable grain production | Farm Weekly

  • Trending
  • Comments
  • Latest
Climate change in our backyard: Manitoba begins to grapple with the consequences – Winnipeg

Climate change in our backyard: Manitoba begins to grapple with the consequences – Winnipeg

August 10, 2021
Repsol starts marketing debut sustainability-linked bond sale

Repsol starts marketing debut sustainability-linked bond sale

June 29, 2021
Sustainability Ambitions Soaring at KCI

Sustainability Ambitions Soaring at KCI

December 6, 2021
Chris Pratt explains where the White Spikes originated

Chris Pratt explains where the White Spikes originated

July 3, 2021
Stop burning our rights! What governments and corporations must do to protect humanity from the climate crisis – World

Stop burning our rights! What governments and corporations must do to protect humanity from the climate crisis – World

Biden said to mull dropping corporate tax hike to fund jobs plan

Biden said to mull dropping corporate tax hike to fund jobs plan

Global investors pressure Asian utilities to cut emissions

Global investors pressure Asian utilities to cut emissions

Global inequity could derail path to net zero

Global inequity could derail path to net zero

What’s With A24’s Religious Obsession?

What’s With A24’s Religious Obsession?

August 12, 2022
Governor Hochul Announces Completion of $16 Million Affordable Housing Development in Monroe County

Governor Hochul Announces Completion of $16 Million Affordable Housing Development in Monroe County

August 12, 2022
EU ban on Russian coal enters into force

EU ban on Russian coal enters into force

August 12, 2022
Immune system insights and Thai climate calculator: News from the College | Imperial News

Immune system insights and Thai climate calculator: News from the College | Imperial News

August 12, 2022

Recent News

What’s With A24’s Religious Obsession?

What’s With A24’s Religious Obsession?

August 12, 2022
Governor Hochul Announces Completion of $16 Million Affordable Housing Development in Monroe County

Governor Hochul Announces Completion of $16 Million Affordable Housing Development in Monroe County

August 12, 2022
EU ban on Russian coal enters into force

EU ban on Russian coal enters into force

August 12, 2022
Immune system insights and Thai climate calculator: News from the College | Imperial News

Immune system insights and Thai climate calculator: News from the College | Imperial News

August 12, 2022

Recent News

What’s With A24’s Religious Obsession?

What’s With A24’s Religious Obsession?

August 12, 2022
Governor Hochul Announces Completion of $16 Million Affordable Housing Development in Monroe County

Governor Hochul Announces Completion of $16 Million Affordable Housing Development in Monroe County

August 12, 2022
EU ban on Russian coal enters into force

EU ban on Russian coal enters into force

August 12, 2022

Browse by Category

  • Biodiversity
  • Climate Change
  • Energy
  • Filmmaking
  • Food
  • Investment
  • Management
  • Sustainability
  • Technology
  • Transportation

Follow Us

  • Privacy & Policy
  • About Us
  • Contact Us
  • Advertise

© 2021 Copyright Green Reporter

No Result
View All Result
  • Home
  • Biodiversity
  • Climate Change
  • Energy
  • Filmmaking
  • Food
  • Investment
  • Management
  • Sustainability
  • Technology
  • Transportation

© 2021 Copyright Green Reporter