The module IV was built in native forest on the São Nicolau Farm in 2010/2011 covering an area of 5 km². This module has 12 one-hectare LTER plots. The vegetation is characterized as an open and dense rainforest with soil clay. In the area are common tree species such as Bertholletia excelsa, Copaifera langsdorffii, Hymenaea courbaril, and Swietenia macrophylla together with shrub-tree species from the families Moraceae, Fabaceae, Lauraceae and Burseraceae. The relief is fairly flat (altitude 200 -300 m a.s.l). The climate is tropical, hot and humid, with an average temperature of 24ºC and relative humidity of around 80%. This module has a good structure for accommodation for researchers such as laboratory, electricity, internet, etc.