Plant and Soil, February 1983, Volume 71, Issue 1, pp 171–188

Root architecture and tree stability

Tree Root Architecture: Form and Function

Kurt S. Pregitzer

The New Phytologist

Vol. 180, No. 3 (Nov., 2008), pp. 562–564

Plant and Soil, October 1983, Volume 75, Issue 3, pp 443–448

Changes in the water-permeability of roots of some trees during drought stress and recovery, as related to problems of growth in urban environment

I hope these help :)

Thanks.  I'll take a look.  I recently found

Schenk, H. J., and R. B. Jackson. 2002. The global biogeography of roots. Ecological Monographs 72(3):311-328.

H. JOCHEN SCHENK and ROBERT B. JACKSON, 2002, Rooting depths, lateral root spreads and below-ground/above-ground allometries of plants in water-limitedecosystems, Journal of Ecology 90, 480–494.

Their dataset is available at:  https://daac.ornl.gov/VEGETATION/guides/global_root_profiles.html

Cite this data set as follows:

Schenk, H. J., and R. B. Jackson. 2003. Global Distribution of Root Profiles in Terrestrial Ecosystems. Data set. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/660.

You're welcome :)