US Long-Term Ecological Research Network

WSC - Leaf area index (LAI) at various points within Wibu field site, 2012-2014

Leaf area index (LAI) measurements collected at various points within the Wibu field site between 2012-2014. Measurements were collected approximately weekly from plant emergence until appr. 1 month past the onset of senescence. The Wibu field site is a commercial agricultural field, which grew corn in the 2012, 2013, and 2014 growing seasons; therefore, these are all LAI values for corn. See Zipper and Loheide (2014) Ag. For. Met. for more information about the field site and use of the LAI data.
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Measurements were made using a Licor-brand LAI-2200 device at approximately weekly intervals during the 2012, 2013, and 2014 growing seasons. At each point, the measurements are the average LAI value calculated from 20 subcanopy measurements ranging from in-line with planted rows to the area between rows. In 2012 and 2013, measurements were taken exclusively during diffuse light conditions (sunrise, sunset, or full cloud cover). In 2014, measurements were taken during daylight hours and corrected for light scattering using the LAI-2200C correction described on their website. This means that 2014 data is less accurate than 2012-2013 data. Note that, for each growing season, a date is listed with 0 LAI – this corresponds to the date prior to emergence at each site.After installation of wells and soil monitoring gear in each of the 2012, 2013, and 2014 growing seasons, we used a Topcon GR5 RTK-GPS to collect the location of each relevant point within the field. In 2014, a gridded set of soil sampling points was also measured.
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