| Impact ID | 4606 |
| Impact Type | Habitat Alteration |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | Phalaris arundinacea replaced wetland plants in Portland, Oregon, creating monotopic stands and changing and dominating the canopy cover in the systems. The stands also decreased organic content and increased moisture in the soil of the area. |
| Reference | 36923 |
| Cost | |
| Location | Portland, OR, USA |