Monitoring impacts of harvesting practices on changes in soil processes that could affect long-term soil productivity in rotational timber harvests is critical to insure future productivity. As an affiliation of the USFS's national Long-Term Soil Productivity Network, two intensively managed Douglas-fir plantations in Western Oregon and Washington were selected to examine effects of varying degrees of post-harvest logging debris removal and herbicide application on foliar litter decomposition and net nitrogen mineralization in the upper 15 cm of mineral soil during the first two years following treatment. Outcomes of this research will assist managers in prescription of woody debris manipulation and vegetation control that maintains long-term soil productivity.