Record Display for the EPA National Library Catalog
RECORD NUMBER: 17 OF 1034
|OLS Field Name||OLS Field Data|
|Main Title||Acid fog effects on conifer seedlings.|
|Author||Turner, D. P. ; Tingey, D. T. ; Hogsett, W. E.|
|CORP Author||Corvallis Environmental Research Lab., OR. ;Forest Service, Washington, DC. ;Western Conifers Research Cooperative, Corvallis, OR.|
|Publisher||U.S Environmental Protection Agency, Corvallis Environmental Research Lab.,|
|Additional Subjects||Acidification ; Fog ; Forest trees ; Injuries ; Vegetation ; Softwoods ; Biomass ; Production ; Pine trees ; pH ; Exposure ; Growth ; Nutrients ; Acid fog ; Acid rain ; Pseudotsuga menzieii ; Pinus ponderosa ; Tsuga heterophylla|
Experiments were performed to assess the effects of acid fog on foliar injury, biomass production, and nutrient leaching in selected conifers. One-year old seedlings of Pseudotsuga menzieii, Pinus ponderosa, Tsuga heterophylla and Thuja plicata were exposed episodically to fog events of variable duration (22 events over a 60 day period for a total of 93 hr). Exposures occurred in open top chambers with fog acidified to pHs of 2.1, 3.1 or 5.6. Foliar injury was observed only in T. heterophylla (pH 2.1 and 3.1) and T. plicata (pH2.1). The low pH fog treatments significantly reduced root biomass in T. heterophylla and across species there was a trend towards a reduced proportion of total dry weight as roots with decreasing fog pH. Fog pH did not affect total biomass production or foliar nutrient contents. However, plant growth and foliar nutrient levels were higher in plants grown at the higher nutrient level.
"1989" "EPA 600/D-89/205".