Ultraviolet radiation and terrestrial ecosystems.
Krizek
Donald T
DT
Sustainable Agricultural Systems Laboratory, Animal and Natural Resources Institute, Agricultural Research Service, U. S. Department of Agriculture, Beltsville, MD, USA. krizekd@ba.ars.usda.gov
Chalker-Scott
Linda
L
D017753:Ecosystem; D010944:Plants / Q000528:radiation effects; D014466:Ultraviolet Rays