Assess understanding of biogeochemical processes controlling nitrogen cycling and removal in riparian buffer zones, including microbial transformations (nitrification, denitrification, ammonification), plant uptake, sorption, and hydrological/redox drivers; evaluate how soil texture, organic matter, temperature, and hydrologic connectivity influence rates and removal efficiency; interpret representative field or laboratory data, compare design and management strategies, and identify appropriate monitoring indicators and key uncertainties.