What circumstances led to the foundation of 'scientific forestry' by the German expert Dietrich Brandis?

Explanation

Brandis felt that a proper system had to be adopted to manage forests and that people had to be trained in the science of conservation.
He needed legal sanction and rules on the use of forests.
He felt that the felling of trees and grazing had to be restricted so that forests could be preserved for timber production.
He set up the Indian Forest Service in 1864 and helped to formulate the Indian Forest Act of 1865.
The Imperial Forest Research Institute was set up at Dehradun in 1906.
The system they taught here was called .scientific forestry..