The Pantanal is one of the greatest wetlands. It is seasonally flooded. It is very flat and it is a place that is extremely seasonal. This is David Jackson, from two summers ago. The problem with the soil here in tropical regions is that it rains a lot.
Nutrients run out from the soil when it rains.
Nutrients are only found in living trees and organisms. When you cut those down, the nutrients disappear rather quickly. The Pantanal is a huge inland freshwater marsh. There is really no influence from the sea. It is a freshwater environment.