"The Everglades at the southern tip of Florida—the remains of what was once a vast ecosystem—is interconnected with a large hydrologic system that really begins in Orlando with the northern Everglades," says Patrick Bohlen, a professor of biology at University of Central Florida.
The heart of the system is Lake Okeechobee, he continues, which collects water from the northern Everglades region. This water then used to flow from the lake into the Everglades of the south.
But this natural path of water has been greatly altered by people, leading to a host of environmental problems that state and federal scientists, policy makers, conservationists, and private landowners are now trying to solve. On Monday, Nov. 4, at 2:15 pm, Bohlen will present "Wetland Restoration in the Northern Everglades: Watershed Potential and Nutrient Legacies." His talk is part of the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America Annual Meetings, Nov. 3-6 in Tampa, Florida.
One of the big challenges is nutrient pollution. Land in the northern Everglades is mostly privately owned, and urbanization and agriculture now send runoff laden with fertilizers and other contaminants into Lake Okeechobee. This nutrient-contaminated water would damage the delicate southern Everglades should it reach them. So, much of the water that historically flowed south from Lake Okeechobee is now diverted to estuaries on Florida's east and west coasts.
As a result, the southern Everglades are somewhat starved for water, while the coastal estuaries receive far too much from the lake. Although a connection hasn't been definitively made, heavy flows of nutrient-rich freshwater into the estuaries are suspected in die-offs of eelgrass, manatees and pelicans; huge blooms of algae; and zones of oxygen-starved water, Bohlen says.
The situation reached a crisis this summer, but people have actually been working to restore the northern Everglades ever since problems with Lake Okeechobee first emerged in the 1980s. During his talk, Bohlen will first summarize these issues and then discuss his research on the effectiveness of various restoration practices and policies.
Cattle ranching is the main land use directly north of the lake. So, one restoration practice is to pay ranchers to restore wetlands or create ponds to hold water on their lands. This way, water from the northern Everglades doesn't flow as quickly or in as large amounts into Lake Okeechobee, taking pressure off the lake, its dike, and the estuaries. It may also be cheaper to store water in this manner, rather than in huge public works projects.
Plus, by holding back some water in restored marshes or ponds "in theory, at least, you'll also be holding back some of the nutrients," Bohlen says. Restored wetlands are generally very good, in fact, at removing nitrogen from the system. Phosphorus is trickier. According to Bohlen's research, re-flooding land that was formerly drained and farmed can actually release stored phosphorus into the water, rather than removing it.
"There's a tremendous legacy of accumulated phosphorus in the soils due to past fertilizer use," Bohlen says. "So we have this legacy that we have to live with."
Members of the media receive complimentary registration to the joint ASA, CSSA, SSSA meetings. To register or to arrange a one-on-one interview with Bohlen, please contact Susan Fisk at the email address above by Oct. 25, 2013.
Susan Fisk | EurekAlert!
Raiding the rape field
23.05.2018 | Julius-Maximilians-Universität Würzburg
New technique reveals details of forest fire recovery
17.05.2018 | DOE/Brookhaven National Laboratory
The more electronics steer, accelerate and brake cars, the more important it is to protect them against cyber-attacks. That is why 15 partners from industry and academia will work together over the next three years on new approaches to IT security in self-driving cars. The joint project goes by the name Security For Connected, Autonomous Cars (SecForCARs) and has funding of €7.2 million from the German Federal Ministry of Education and Research. Infineon is leading the project.
Vehicles already offer diverse communication interfaces and more and more automated functions, such as distance and lane-keeping assist systems. At the same...
A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.
The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...
At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.
At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...
There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?
At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
25.05.2018 | Event News
02.05.2018 | Event News
13.04.2018 | Event News
25.05.2018 | Event News
25.05.2018 | Machine Engineering
25.05.2018 | Life Sciences