. Building Illinois' biological memory : a framework for long-term ecosystem monitoring. Environmental monitoring. Each year 30 randomly selected sites are monitored by CTAP research scientists in each of 4 habitat types—forest, wetland, grassland, and stream. These sites are monitored on a five-year cycle: for example, sites sampled in 1997 will be resampled in 2002, etc. Site selection consisted of randomly ranking Public Land .Survey Townships for each of the four habitat types, as illustrated on the four maps below. Within townships, potential sampling sites were also randomly selected and
. Building Illinois' biological memory : a framework for long-term ecosystem monitoring. Environmental monitoring. Each year 30 randomly selected sites are monitored by CTAP research scientists in each of 4 habitat types—forest, wetland, grassland, and stream. These sites are monitored on a five-year cycle: for example, sites sampled in 1997 will be resampled in 2002, etc. Site selection consisted of randomly ranking Public Land .Survey Townships for each of the four habitat types, as illustrated on the four maps below. Within townships, potential sampling sites were also randomly selected and ranked. CTAP research scientists evaluate sites beginning with rank I until reaching the first suitable site; one site is sampled in each township. FOREST Forested land was identified using the deciduous, coniferous, and forested wetland classes of the Land Cover of Illinois database. For this monitoring program, forests had to be at least 20 acres in size and have a minimum width of 200 meters. WETLAND Potential sampling locations for wetlands were determined using the digital Illinois Wetlands Inventory database. Potential wetland sampling sites had to be dominated by emergent vegetation and greater than two acres in size. GRASSLAND Grasslands were identified using rural and urban grassland classes of the Land Cover of Illinois database. Rural grassland includes pastures, hayfields, idle fields, and non-agricultural land such as reclaimed mineland, road and railroad right-of-ways, and remnant prairies. Urban grassland includes open space, parks, and golf courses in urban areas. STREAM The Illinois Streams Information System (ISIS), a digital database of Illinois streams, was used as the basis for identification of stream sampling sites. The database includes streams draining areas greater than 10 square miles and is based on USGS 1:100,000 data. Each stream is represented by discrete segments beginning and ending at the public land survey section lines or at stream confiue
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