Response of a white clover indicator system to tropospheric ozone at eight locations in the United States
✍ Scribed by Allen S. Heagle; Joseph E. Miller; Boris I. Chevone; Thomas W. Dreschel; William J. Manning; Patrick M. McCool; C. Lynn Morrison; Grady E. Neely; Joanne Rebbeck
- Publisher
- Springer Netherlands
- Year
- 1995
- Tongue
- English
- Weight
- 404 KB
- Volume
- 85
- Category
- Article
- ISSN
- 0049-6979
No coin nor oath required. For personal study only.
✦ Synopsis
A white clover (Trifolium repens L.) system using measured biomass to indicate effective concentrations of tropospheric ozone (03) has been_ developed. The system utilizes the relative response of an O3-sensitive done 0YC-S) and an O3-resistant clone (hlC-R) grown in 15-liter pots. Forage (leaves, stems and flowers) is cut, dried, and weighed at 28-day intervals. Forage dry weight ratios (NC-S[NC-R) for individual or multiple harvests indicate 03 concentratious during growth. In, 3 years of testing in open-top field chambers at Raleigh, North Carolina, 03 always decreased growth of NC-S more than that of NC-R and the NC-S/NC-R ratio routinely decreased as the 03 cmacelatmtion increased. A national field test was performed in 1993 and 1994 to determine if the clover system can account for effects of climatic variables on clover growth per-se, and if climatic variables affect the relative response of the two clones to 03. Eight locations (Corvallis,