Seasonal patterns of juglone in soil beneath Juglans nigra (black walnut) and influence of J. nigra on understory vegetation

The allelopathic nature of J. nigra L. was investigated in several planted mixed hardwood stands located near Syracuse, New York. Concentrations of chloroform-extracted juglone from soil collected beneath J. nigra was determined by thin-layer chromatography (TLC) and high-pressure liquid chromatogra...

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Bibliographic Details
Published in:Journal of chemical ecology 1990-04, Vol.16 (4), p.1111-1130
Main Authors: De Scisciolo, B. (SUNY College of Environmental Science and Forestry, Syracuse, NY), Leopold, D.J, Walton, D.C
Format: Article
Language:English
Subjects:
ALELOPATIA
ALLELOPATHIE
ANALISIS DEL SUELO
ANALYSE DE SOL
Animal and plant ecology
Animal, plant and microbial ecology
Autoecology
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
JUGLANS NIGRA
Plants and fungi
QUINONAS
QUINONE
SOTOBOSQUE
SOUS BOIS
VARIACION ESTACIONAL
VARIATION SAISONNIERE
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Summary:The allelopathic nature of J. nigra L. was investigated in several planted mixed hardwood stands located near Syracuse, New York. Concentrations of chloroform-extracted juglone from soil collected beneath J. nigra was determined by thin-layer chromatography (TLC) and high-pressure liquid chromatography (HPLC). Soil juglone concentrations were corrected based on recovery of synthetic juglone added to soil. Soil juglone levels were high in the spring, decreased during the summer, and were high again in the fall. The quantification of juglone from soil by HPLC was found to be more accurate than by TLC. Regression analysis indicated that individual tree variation in soil juglone levels could not be explained by differences in soil moisture, pH, organic matter content, and texture. The results of juglone recovery experiments suggest that chloroform-extractable juglone does not persist in soil. Juglone degradation by microorganisms could only explain a portion of the juglone decline. Ordinations revealed that the herbaceous and woody vegetation beneath J. nigra, in comparison to vegetation beneath Acer saccharum and Quercus rubra, is distinct in only one of the four stands studied. This vegetational difference did not appear to be a consequence of any strong allelopathic influences of J. nigra (Scheffe's method of contrast, chi-square analysis). The allelopathic nature of juglone under these field conditions is questionable
ISSN:0098-0331
1573-1561
DOI:10.1007/BF01021015