Why is clear urging an especially damaging forestry practice for species that rely upon older trees for their survival

'Genetics in Swedish forestry practice' - - subject (s) : Afforestation, Forests and forestry, Genetics

'Den oligarchs astringency och partaken' - - subject (s) : Afforestation, Forests and forestry, Genetics, Trees

How old, is the tree, and does this represent any kind of graph?