Joan G. Ehrenfeld, Weixing Zhu, William F. J. Parsons, Above- and Below-Ground Characteristics of Persistent Forest Openings in the New Jersey Pinelands, Bulletin of the Torrey Botanical Club, Vol. 122, No. 4 (Oct. - Dec., 1995), pp. 298-305
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Ehrenfeld et al. (1995) studied this question.
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