Assertion: birch's root | /r/CapableOf | supplement the nutrition of the tree
Facets:
value: in some cases
type: TEMPORAL
value: through symbiotic associations
type: MANNER
Source sentences:
text: In some cases, roots supplement the nutrition of the tree through symbiotic associations, such as with nitrogen-fixing microorganisms and fungal symbionts called mycorrhizae, which are known to increase phosphorous uptake.