Processing of leaf litter in two northern jarrah forest streams, Western Australia: II. The role of macroinvertebrates and the influence of soluble polyphenols and inorganic sediment

摘要: The long-term processing of jarrah (Eucalyptus marginata) leaves was examined in a small forest stream to determine the role played by macroinvertebrates and influence soluble polyphenols leaves. widely used exponential model litter inadequate describing fate Decomposition occurred three distinct phases best described quadratic model. After substantial rapid loss due leaching, virtually inhibited during summer autumn, with no associated increase organic nitrogen content. Macroinvertebrates significant latter part year, approximately 25% initial leaf mass. High levels had an inhibitory effect on microbial colonization leaves, as indicated However, pre-leaching these compounds rate decomposition nor bag fauna. Polyphenols released into summer, when flows are low, may reach high concentrations contribute slow at this time. Leaf nearby sedimented compared that undisturbed stream. Sediment disrupted processing, eliminating contribution made invertebrates. Smothered bags became anoxic, restricting activity reducing quality. low attributed differences more animals but shredders were poorly represented predators most abundant feeding group. density likely be result reduced availability detritus rather than selective predation. Whatever reason, invertebrates denied access important source energy. Inorganic sediment can have profound function interfering shredder-CPOM pathway.