should be considerably less in field UV supplementation experiments than in most 

 laboratory experiments which employ fluorescent lamps as the primary UV-B 

 radiation source. 



REFERENCES: 



Caldwell, M.M., 1981. Plant response to solar ultraviolet radiation. In, 

 Encyclopedia of Plant Physiology, vol. 12A, Physiological Plant Ecology. I. 

 Responses to the Physical Environment (O.L. Lange, P.S. Nobel, C.B. Osmond, and 

 H. Ziegler, eds.). Springer, New York, 169 pp. 



Caldwell, M.M., L.B. Camp, C.W. Warner, and S.D. Flint, 1985. Action spectra and 

 their key role in assessing biological consequences of solar UV-B radiation 

 change. In, NATO ASI Series, Vol. 8: Stratospheric Ozone Reduction, Solar 

 Ultraviolet Radiation and Plant Life (R.C. Worrest and M.M. Caldwell, eds.). 

 Springer-Verlag, Berlin, pp. 87-111. 



Caldwell, M.M., W.G. Gold, G. Harris and C.W. Ashurst, 1983. A modulated lamp 

 system for solar UV-B (280-320 nm) supplementation studies in the field. 

 Photochem. Photobiol. 37: 479-485. 



Caldwell, M.M., R. Robberecht, and W.D. Billings, 1980. A steep latitudinal 

 gradient of solar ultraviolet-B radiation in the arctic-alpine life zone. 

 Ecology 61: 600-611. 



Natchwey, D.S., and R.D. Rundel , 1982. Ozone change: biological effects. In, 

 Stratospheric Ozone and Man (F.A. Bower and R.B. Ward, eds.). CRC Press, Boca 

 Raton, 81 pp. 



Rundel, R.D., 1983. Action spectra and estimation of biologically effective UV 

 radiation. Physiol. Plant. 58: 360-366. 



Setlow, R.B., 1974. The wavelengths in sunlight effective in producing skin 

 cancer: a theoretical analysis. Proc. Natl. Acad. Sci . USA 71: 3363-3366. 



