GIS Application: Spatial Surfacing of Point Data for 'Myriophyllum'Investigations. Long Term Resource Monitoring Program

摘要

Eurasian watermilfoil (Myriophyllum spicatum L.) has become a nuisance plantspecies in North America. In recent years, it has become increasingly abundant in the Upper Mississippi River System (UMRS) and at some locations has regularly colonized areas which had previously hosted wild celery (Vallisneria americanna Michx.), an important waterfowl food species. In summer 1993, initial efforts were undertaken to understand the environmental requisites of Myriophyllum in the UMRS. To accomplish this, a sampling grid was established within a Myriophyllum bed in Pool 7 near La Crosse, Wisconsin. In total, 164 sites were sampled, and at each site information was collected on plant biomass, water depth, sediment moisture content, and sediment organic content. In this study, the data were examined via geographic information systems (GIS) software.