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Published online 5 April 2007
Published in J Environ Qual 36:709-717 (2007)
DOI: 10.2134/jeq2006.0231
© 2007 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Occurrence and Fate of the Phytotoxin Juglone in Alley Soils under Black Walnut Trees

Guntram R. von Kiparskia, Linda S. Leeb,* and Andrew R. Gillespiea

a Dep. of Forestry and Natural Resources, Purdue Univ., West Lafayette, IN 47907-2051. G.R. von Kiparski, current address, Center for Accelerator Mass Spectrometry, Lawrence Livermore National Lab., Livermore, CA 94550-2051
b Dep. of Agronomy, Purdue Univ., West Lafayette, IN 47907-2054


Figure 1
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  		Fig. 1. Reversible sorption isotherms (T = 22°C) for juglone on unsterile and 60Co {gamma} irradiated Ryker A and B horizon soils after a 24-h equilibration in 0.0025 M CaCl2. Reversibly sorbed juglone (Cs,ext) was determined by direct extraction with 1:1 (v/v) ACN/MeOH. No juglone was detected in aqueous and solvent extracts of the unsterile A horizon soil. Kd (L kg–1) is the linear sorption coefficient and R2 is the regression correlation coefficient.

 

Figure 2
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  		Fig. 2. Estimated juglone pore water concentrations (Cpw) in equilibrium with total extractable juglone (Cs*) from Ryker A horizon soils beneath a black walnut agroforestry system at two locations within the cropping alley (1.2 and 4.2 m from the tree row). The solid line is the prediction from Eq. [1] in which the reversible sorption coefficient was estimated using for average % organic carbon values of the two alley positions. Symbols are predicted Cpw values for specifically measured soil concentrations from the field for reference.

 




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