How does a tree species' niche determine where it can survive and reproduce?

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Tall giant sequoia trees with reddish bark and thick trunks rise closely together in a dense forest at Sequoia National Park, California. — Tree A stand of giant sequoia trees (*Sequoiadendron giganteum*) in Sequoia National Park, California.

A tree species' niche is defined as the set of environmental conditions—including climate, soil, topography, and biotic factors—that permit a plant to exist based on its specific morphological, anatomical, and physiological capacities.1

These conditions determine survival and reproduction through several key mechanisms:

Limiting Values: For every environmental factor, there are threshold values that define the niche. A species can only survive and reproduce where these factors remain within its tolerance range.1
Resource Competition: Trees compete for light, space, water, and nutrients. A species' ability to survive often depends on its efficiency in using these resources and its capacity to compete against other inhabitants of the same habitat. In many cases, species that are highly tolerant of extreme conditions may be outcompeted by others in more favorable environments.1
Adaptation and Plasticity: Trees evolve subpopulations adapted to local constraints, such as modifying the temperature optimum for photosynthesis. Phenotypic plasticity further allows individuals to adjust their growth and form to match the stresses of their specific environment.1