Seedlings of Pinustaeda L. were planted in 1982 on a clear-cut site in the northeastern Piedmont of North Carolina. Two intensities of site preparation (chopping and shear–pile–disk) were applied in the previous year, and seedlings were maintained under three intensities of cultural practice (no treatment, application of herbicides, and hand weeding) for control of successional vegetation regrowth. Both site preparation and cultural practice significantly affected pine performance (relative growth rate) and predawn leaf water potentials. Soil water potentials showed no significant treatment effects, even during a severe drought in the summer of 1983. An index of moisture strain for the pine seedlings was developed by regressing predawn leaf water potentials of individual pines against the mean leaf water potentials of all pines using data collected on 5 days in the summer of 1983. This index accounted for 55% of the variation in pine performance. The predictive value of the index resulted from its integration of a variety of stress factors and was probably enhanced by its application during a dry growing season.

The interactions of aniline with soil at an industrial spill site were investigated. Sorption of aniline to the soil was observed to occur through a two-step mechanism. The first step was an ion exchange process with the protonated amine serving as an organic cation. This step was influenced by solution pH and ionic composition. The second step was covalent bonding most likely with quinone moieties and oxidation with polymerization of aniline. The extent of covalent bonding was influenced by the presence of oxygen and redox potential. The majority of aniline that was bound to the soil did not readily desorb under a variety of abiotic conditions. However, aniline was released to a significant extent in the presence of denitrifying and methanogenic microbial activity. Aniline in aqueous solution was readily biodegradable under aerobic and denitrifying conditions. Soil-bound aniline was observed not to be biodegradable. This paper provides an overview of results.

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The interactions of aniline with soil at an industrial spill site were investigated. Sorption of aniline to the soil was observed to occur through a twostep mechanism. The first step was an ion exchange process with the protonated amine serving as an organic cation. This step was influenced by solution pH and ionic composition. The second step was covalent bonding most likely with quinone moieties and oxidation with polymerization of aniline. The extent of covalent bonding was influenced by the presence of oxygen and redox potential. The majority of aniline that was bound to the soil did not readily desorb under a variety of abiotic conditions. However, aniline was released to a significant extent in the presence of denitrifying and methanogenic microbial activity. Aniline in aqueous solution was readily biodegradable under aerobic and denitrifying conditions. Soil-bound aniline was observed not to be biodegradable. This paper provides an overview of results. -Environ Health Perspect 103(Suppl 5): 71-73 (1995)

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