Evaluation of Green Ash Root Responses as a Soil Wetness Indicator1
- Billy J. Good,
- Stephen P. Faulkner and
- William H. Patrick2
Green ash (Fraxinus pennsylvanica Marsh.) seedlings were transplanted to plots along four bottomland hardwood transects in Louisiana which represent a wide range of soil-moisture and flooding regimes, and include the following soil series: Arkabulta (Aeric Fluvaquents, Rosebloom (Typic Fluvaquents), Norwood (Typic Udifluvents), Moreland (Vertic Hapludolls), Tensas (Vertic Ochraqualfs), Kobel (Vertic Haplaquepts), Goldman (Aquic Hapludalfs) and Fausse (Typic Fluvaquents). Each plot was classified as “wet” or “mesic” based on soil wetness data. Root-coating constituents (Al, As, Ca, Fe, K, Mn, Ni, P, and Zn) and alcohol dehydrogenase (ADH) activity of the seedlings were assayed after 1.5 yr. A two-group discriminant analysis function was developed in order to determine how well the seedling root data would predict the predetermined site-wetness category of each seedling's plot. The deposition of rootcoating constituents and anaerobic respiration were distinct enough between the seedlings of the wet and mesic sites to be useful in the development of a fairly reliable model for site-wetness classification. The percentages of seedlings correctly grouped into the mesic and wet categories were 88.9 and 92.0, respectively. The variables chosen for inclusion in the discriminant analysis function, in descending order of predictive power, were K, Fe/Mn, Ni, Mg, ADH, and Mn.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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