The individual and combined effects of ozone and simulated acid rain on chlorophyll contents, carbon allocation and biomass accumulation of armand pine seedlings

1995 ◽  
Vol 85 (3) ◽  
pp. 1399-1404 ◽  
Author(s):  
Y. Shan ◽  
Z. Feng ◽  
T. Izuta ◽  
M. Aoki ◽  
T. Totsuka
Keyword(s):  
Acid Rain ◽  
Carbon Allocation ◽  
Biomass Accumulation ◽  
Simulated Acid Rain ◽  
Combined Effects ◽  
Chlorophyll Contents ◽  
Pine Seedlings ◽  
The Individual

Nutritional response of loblolly pine exposed to ozone and simulated acid rain

1994 ◽  
Vol 24 (3) ◽  
pp. 453-461 ◽  
Author(s):  
Timothy R. Baker ◽  
H. Lee Allen ◽  
Michele M. Schoeneberger ◽  
Lance W. Kress
Keyword(s):  
Acid Rain ◽  
Loblolly Pine ◽  
Biomass Accumulation ◽  
Nutrient Status ◽  
Simulated Acid Rain ◽  
Nutrient Concentrations ◽  
Total Biomass ◽  
Late Season ◽  
Elevated Ozone ◽  
Rain Effect

The effects of ozone and simulated acid rain on the aboveground nutrient composition of loblolly pine (Pinustaeda L.) seedlings were studied in a 2-year open-top chamber experiment in the Piedmont of North Carolina. Multivariate analysis of variance tests indicated significant ozone response in the 2nd year but no significant simulated acid rain effect in either year. No interaction among treatments was detectable. Seedlings responded to increasing ozone exposures with increasing concentrations of nitrogen, phosphorus, potassium, magnesium, and calcium in the stem, branches, and foliage. The response of increased nutrient concentration was associated with decreased total biomass accumulation. The nutritional responses were most prominent in late season flushes of foliage and are probably related to ozone-induced premature abscission of early-season flushes. High nutrient concentrations in the stem, branches, and late-season flushes of trees exposed to elevated ozone levels suggest retranslocation and slower growth rates resulted in better aboveground nutrient status and lower nutrient demand from the soil.

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