litterfall

noun2

1. •
   Plant material that falls to the ground, such as leaves from trees.

   • Litterfall is provided for as long as the mature forest exists. — 2008
2. •
   The total mass of plant material falling to the ground per unit area, or the mass collected at a specific site.

   • The remaining forest types had similar mean litterfalls ranging from 3333 to 6484 kg ha⁻¹ year⁻¹ — 1986