Rhizoplane  - The rhizoplane is the site of exudates.  The rhizoplane is the boundary where soil elements in water are absorbed into the tree.  Under an electron microscope, the rhizoplane appears as a jelly where microorganisms and tree cells mix, making it impossible to tell which side is tree and which is soil. 

See "A Touch of Chemistry " and

"Troubles in the Rhizosphere" for starters.

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