Leaf Litter -- Leaves (IMAGE) University of California - Berkeley Caption Leaf litter falls to the ground where it is decomposed by microbes. As it decays it releases nitrogen, a key nutrient for plants and animals. Credit (Photo by William S. Currie) Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.