Table 1. Seeded species and measures of realized diversity and composition in three biofuel feedstock production systems.
| Switchgrass | Native grasses | Restored prairie | |
|---|---|---|---|
| Species richness | 3.6 ± 1.9 | 6.0 ± 2.0 | 10.9 ± 1.7 |
| Shannon’s diversity index | 0.7 ± 0.4 | 1.4 ± 0.3 | 1.9 ± 0.2 |
| C3 grass cover (%) | 5.0 ± 11.0 | 72.7 ± 29.8 | 90.2 ± 22.7 |
| C4 grass cover (%) | 127.2 ± 49.2 | 103.2 ± 47.5 | 21.1 ± 22.5 |
| Non-legume forb cover (%) | 11.9 ± 18.8 | 6.8 ± 11.3 | 86.5 ± 24.9 |
| Legume cover (%) | none observed | none observed | 10.4 ± 14.2 |
| Seeded species | Panicum virgatum L. | Panicum virgatum L. | Panicum virgatum L. |
| Andropogon gerardii Vitman | Andropogon gerardii Vitman | ||
| Elymus canadensis L. | Elymus canadensis L. | ||
| Schizachyrium scoparium (Michx.) Nash | Schizachyrium scoparium (Michx.) Nash | ||
| Sorghastrum nutans L. | Sorghastrum nutans L. | ||
| Koeleria macrantha (Ledeb.) Schult. | |||
| Anemone canadensis L. | |||
| Asclepias tuberosa L. | |||
| Baptisia alba (L.) Vent. var. macrophylla (Larisey) Isley | |||
| Desmodium canadense (L.) DC. | |||
| Lespedeza capitata Michx. | |||
| Monarda fistulosa L. | |||
| Oligoneuron rigidum (L.) Small var. rigidum | |||
| Ratibida pinnata (Vent.) Barnhart | |||
| Rudbeckia hirta L. | |||
| Silphium perfoliatum L. | |||
| Solidago erecta Pursh | |||
| Symphyotrichum novae-angliae (L.) G.L.Nesom. |
Cover measurements allowed multiple species hits per point; functional group cover is summed over all species and can thus exceed 100%. Values are means ± standard deviation.