Do lawns simply have a more attractive suite of species than the matrix, or do the same species become more attractive when occurring on lawns?

Samples were taken over a two-month period (Feb-Mar 2011) during the wet season (Oct-May in Kruger National Park and Nov-May in Serengeti National Park) to maximize plant inflorescence and seed abundance for plant identification. The wet season is also the period of most intense grazing and where soil processes such as mineralization to be at a peak. Soil and plant variables were measured to quantify differences between the grazing lawns and the surrounding vegetation matrix (lawn and matrix hereafter). Foliar variables were sampled both at the community and species levels. Community-level samples were used to quantify nutritional variables (e.g., N, P, and Na) and plant structural characteristics that influence palatability (e.g., plant height, leaf to stem ratio) assayed for a bulk (composite) sample that ignores species identity. Species-level sampling was used to investigate intraspecific variation in these variables across the lawn-matrix boundary within species that are common to both lawn and matrix. In essence I ask: do lawns simply have a more attractive suite of species than the matrix, or do the same species become more attractive when occurring on lawns?