Stabler and Still estimate density and standing biomass of tamarisk along waterways in a northwest to southeast transect in Oklahoma to test the hypothesis that environmental conditions in northwest Oklahoma would make successful invasion by tamarisk more likely. They found that the invasive potential of tamarisk in Oklahoma is likely limited by streamflow and climate but not by soil salinity. 

Stabler, L.B. and Still, S.M. 2011. Density and biomass of salt cedar (Tamarix spp.) along a northwest to southeast transect in Oklahoma. In Proceedings of the Oklahoma Academy of Science (pp. 1-10).