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Effects of Varying Soil Moisture Upon the Nutrient Uptake of Four Bottomland Tree Species¹

ABSTRACT

Tupelo gum, pin oak, green ash, and sycamore seedlings (Nyssa aquatica L., Quercus palustris M., Fraxinus pennsylvanica M., and Platanus occidentalis L., respectively) were subjected to four soil moisture regimes for 84 days in greenhouse soil cultures. The moisture regimes included (i) saturated soil, (ii) moisture equivalent: return to moisture equivalent daily, (iii) 50% available water: return to moisture equivalent when 50% of the available water had been removed, and (iv) wilting point: return to moisture equivalent when the wilting point had been reached. Comparisons among species and treatments were made on dry weight per seedling top, and contents per seedling top and foliar concentrations of ash, N, P, K, Ca, and Mg. Generally the seedling top weight and nutrient uptake for pin oak, green ash, and sycamore showed the following trend: saturated soil < moisture equivalent > 50% available water > wilting point. Similar data for tupelo gum showed only decreasing values with increasing moisture stress from saturated soil to wilting point. Generally, tissue nutrient concentrations tended to be low for seedlings subjected to saturated soils and high for those subjected to wilting point regime, thus moisture treatments apparently affected growth more than nutrient absorption.

¹ Contribution of Virginia Polytechnic Institute, Blacksburg, Virginia, and State University College of Forestry at Syracuse University, Syracuse, New York. Presented before Div. S-7, Soil Science Society of America, at Kansas City, Mo., Nov. 18, 1964.

² The authors are, respectively, Professor of Silviculture, VPI; Professor of Silviculture, State University College of Forestry; Research Assistant in Plant Physiology, University of California; and Research Assistant in Silviculture, State University College of Forestry.

Received for publication October 30, 1964. Accepted for publication February 22, 1965.