How can clearing and fertilizing land permanently damage scrublands adapted to nutrient-poor soil?

Scrublands that have evolved to thrive in nutrient-poor soil are highly vulnerable to human-induced changes. When land is cleared and fertilizers are added—whether through agricultural practices or as pollution—the resulting shift in soil chemistry can permanently destroy the original ecosystem.2

The primary mechanism for this damage is the amelioration of soil conditions. Scrubland plants are specifically adapted to low-nutrient environments, which act as a limiting factor for growth. By artificially increasing nutrient levels, the soil becomes hospitable to invasive plant species from other vegetation types. These invaders are often able to grow more vigorously than the native scrubland flora, effectively outcompeting and displacing the original vegetation.12

Because these native species are specialized for harsh, nutrient-deficient conditions, they cannot compete once the fundamental environmental constraints of their habitat are removed. Consequently, the unique biodiversity of these scrublands is lost, leading to a permanent alteration of the landscape.2