Abstract
Abstract Seeds of eleven woody species were exposed to 2.3 cm/wk of simulated sulfuric acid rain at pH values of 3.0, 3.5, or 4.0, or to a simulated control rain at approximately pH 5.6. All treatments also contained a neutral mixture of cations and anions based on concentrations reported for Hubbard Brook, N.H. Seeds or seedlings were subject to ambient conditions, except for precipitation. Ambient rainfall was excluded by a partial coveting which allowed some dry deposition. Seeds were planted in winter, 1977; seedlings were harvested the following summer. The dry weights of the top and roots of each seedling were recorded. Although eight species were affected by simulated acid rain, the direction and magnitude of effects varied with species and with treatment. Seedling emergence was stimulated by at least one acid treatment for four species and inhibited for one species. Top growth was stimulated for at least one acid treatment for four species, while root growth was inhibited for one species. Except for one species, whose emergence rate and top growth were both affected, effects were confined to one measured parameter. Forest Sci. 25:393-398.
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Claims 5
Claim · model-written summary
Acid treatment stimulated seedling emergence for four woody species.
Verbatim
t0“Eleven Woody Species”
e0“Seedling emergence was stimulated by at least one acid treatment for four species and inhibited for one species”
e1“to a simulated control rain at approximately pH 5.6”
Claim · model-written summary
Acid treatment inhibited seedling emergence for one woody species.
Verbatim
t0“Eleven Woody Species”
e0“Seedling emergence was stimulated by at least one acid treatment for four species and inhibited for one species”
e1“to a simulated control rain at approximately pH 5.6”
Claim · model-written summary
Acid treatment stimulated top growth for four woody species.
Verbatim
t0“Eleven Woody Species”
e2“Top growth was stimulated for at least one acid treatment for four species, while root growth was inhibited for one species”
e1“to a simulated control rain at approximately pH 5.6”
Claim · model-written summary
Acid treatment inhibited root growth for one woody species.
Verbatim
t0“Eleven Woody Species”
e2“Top growth was stimulated for at least one acid treatment for four species, while root growth was inhibited for one species”
e1“to a simulated control rain at approximately pH 5.6”
Claim · model-written summary
Effects of simulated acid rain varied in direction and magnitude with species and treatment.
Verbatim
t0“Eleven Woody Species”
e3“Although eight species were affected by simulated acid rain, the direction and magnitude of effects varied with species and with treatment”