Sensitivity of Native Desert Vegetation To SO₂and to SO₂and NO₂Combined

Effects of SO2and/or NO2on Native Plants of the Mojave Desert and Eastern Mojave-Colorado Desert

“…Our studies were done under different environmental conditions than those of Hill, et al, 4 or those which occur in their native habitat. Our plants were well watered and fertilized and had multiple exposures to the pollutants but our results confirm their work.…”

“…Our plants were well watered and fertilized and had multiple exposures to the pollutants but our results confirm their work. Hill, et al 4 found visual foliar injury caused by SO2 or SO2 + NO2 to be identical where leaves were large enough to exhibit definite patterns. They fumigated Atriplex canescens with 4 and 6 ppm SO2 for 2 hr and observed no injury.…”

“…Hill, et al 4 found the desert species to be relatively resistant to SC>2-Concentrations of 2.0 ppm SO2 were required to cause injury on all but a few of the 87 species studied.…”

“…southeastern Arizona with SO2 and Hill, et al 4 tested the effects of SO2 and NO2 separately and in combination on 87 desert species growing in the high cold areas of Utah and New Mexico. They fumigated plants in situ with portable structures for two hours with 0.5 to 11 ppm SO2 plus one-third as much NO2 (0.16-3.7 ppm).…”

Effects of Ozone or Sulfur Dioxide on Annual Plants of the Mojave Desert

“…Hill et al 2 found Utah Great Basin Desert species to be generally insensitive to SO 2 even though there was variation in injury response among 87 species tested. The exposures were for only 2 h at a concentration of 0.5-11 ppm, but were conducted in situ with portable structures.…”