I study soil N cycling, forest fertilization and nutrition, application of 15N/13C tracers in forest soils research, soil microbial ecology, land reclamation, carbon sequestration, greenhouse gas emissions, and agroforestry. My lab is also studying the effectiveness of biochars and hydrochars for mitigating greenhouse gas emissions, and remediation of contaminated soil and water, as well as the modification of biochars to improve their efficacy.