Environmental Engineering

The millions of people affected by 2020’s record-breaking and deadly fire season can attest to the fact that wildfire hazards are increasing across western North America.

Both climate change and forest management have been blamed, but the relative influence of these drivers is still heavily debated. The results of a recent study show that in some ecosystems, human-caused climate change is the predominant factor; in other places, the trend can be attributed mainly to a century of fire suppression that has produced dense, unhealthy forests.

Two new projects designed and led by UC Merced researchers will address challenges facing many Californians — wildfire recovery and agricultural labor — but will also have global reach.

One of the biggest challenges in managing crops, especially in large fields, is knowing how much water each section of a field needs. Determining that accurately is a cumbersome process that requires people to hand-pluck individual leaves from plants, put them in pressure chambers and apply air pressure to see when water begins to leak from the leaf stems.

That kind of testing is time consuming and means that farmers can only reach so many areas of a field each day and cannot test as frequently as they should.

School of Engineering professors Roger Bales and Martha Conklin have written a new article for The Conversation discussing the changes that need to be undertaken in land-management practices in California's mountain forests:

Bird species usually are counted twice a year by wildlife surveyors: once during the breeding season and again during the Christmas Bird Count .

New technology, however, is increasing the accuracy of bird population studies. A team of UC Merced researchers is developing a model to recognize bird calls.

Forest restoration is often associated with mitigating wildfire risk and improving ecosystem health throughout the Sierra Nevada. But restoration also dramatically affects water use within forests and the amount of runoff that flows downstream.

The world is a complex place, and humanity faces major challenges. Climate change mitigation might be the most difficult, in large part because of the interdependency of living things and their ecosystems.

How do people transform economic systems so they are also sustainable for people and the planet?

“If we don’t consider how everything connects from a systems perspective, we’re not going to solve grand challenges such as climate change,” Professor Tracey Osborne said. “Not even close.”

It is said that rainforests are the Earth’s lungs, capturing carbon dioxide from the atmosphere, building it into lush vegetation and releasing oxygen and water back into the air.

When people think of engineering in nature, they tend to think of species such as beavers — the tree-felling, dam-building rodents whose machinations can shape the landscape by creating lakes and changing the path of rivers.

But beavers are far from the only organisms to reshape their environment. A squirrel that inadvertently plants oak trees is also an “ecosystem engineer.” Roughly speaking, any organism whose impact on the environment outlasts its own lifetime is an environmental engineer.

By 2050, the U.S. population is estimated to grow to 400 million, and the world population to 9.1 billion, requiring a 70 percent increase in global food production.

UC Merced is one of four campuses across the country uniting to meet that challenge by harnessing the power of innovation and technology to develop precision agriculture for a sustainable future.