Research Program Area: Emissions Monitoring & Control
The Statewide Air Pollution Research Center (SAPRC) has had a continuing mission to investigate the effects of air pollutants on both agricultural crops and native vegetation. To further this mission, SAPRC personnel have maintained the California Air Resources Board (ARB) field exposure facilities at the Experiment Station at the University of Cali- fornia, Riverside for over seven years. These facilities consisted of 20 permanent, cylindrical, open-top field chambers for use with low-growing plants; 28 hemispherical, open-top field chambers for use with small trees; and ancillary pollutant exposure and monitoring equipment. The facilities also included a unique field humidification system for use with the cylindrical chambers and a field fog exposure system.
Tasks carried out for the project have included maintenance of all chambers, maintenance of the pollutant exposure systems and analyzers, maintenance of soil and irrigation/fertilization system, acquisition of equipment insurance, provision of field telephone and sanitation services, and assistance to users of the facility. In addition to general mainte- nance, part of the field site was cleared to grow plants for an ARB-sponsored study of hydrocarbon emissions from vegetation.
The chamber facilities have been used for a wide variety of experiments on the effects of gaseous air pollutants and acidic fog on crops and native plants. This research has resulted in over 25 peer- reviewed publications, reports, and book chapters. Over the past year, a total of five studies were completely or partially carried out in these facilities. ARB-funded studies included:
1. a determination of the effects of ambient ozone on Valencia oranges, and
2. an evaluation of hydrocarbon emissions from vegetation. Studies funded from other sources included
3. an investigation on the effects of ozone and sulfur dioxide on quaking aspen and perennial ryegrass,
4. investigation of the effects of ozone and sulfur dioxide on alfalfa, and
5. a pilot investigation of the long-term injury effects of ozone on conifer seedlings.
The intensive use of the facilities continued to indicate the importance and usefulness of maintaining the field exposure facilities in a condition of readiness so that new experiments can be rapidly initiated to address important issues concerning the effects of air pollutants on vegetation.
For questions regarding this research project, including available data and progress status, contact: Research Division staff at (916) 445-0753
Stay involved, sign up with CARB's Research Email Distribution List