📘 Read the full study in the Journal of Soil and Water Conservation (2026): https://doi.org/10.1080/00224561.2025.2603879 or contact Dr. Chad Bolding for more information.
As global demand for renewable energy grows and pulpwood markets change, biomass energy from forests provides a sustainable solution to utilize forest residues and small diameter trees. While wood pellets are the most common form of woody biomass energy, advancements in processing technologies—specifically pyrolysis and torrefaction—are driving the sector’s growth. These methods involve heating wood residues in low-oxygen environments to produce high-efficiency wood pellets, biocarbon sources, and other energy-rich products.
By utilizing small-diameter trees and logging residues (such as branches and tops) that would otherwise be left to decompose or be burned on-site, these operations turn potential waste into a cost-effective energy resource. However, this growth has sparked a critical question for the industry: Do the intensified removals of woody biomass lead to higher soil erosion or degraded water quality compared to traditional pulpwood harvesting?
A new study led by researchers at the University of Georgia, published in the Journal of Soil and Water Conservation, provides a clear answer: When Best Management Practices (BMPs) are followed, the differences in erosion are minimal and well within sustainable limits.
Why Biomass Harvesting is a Sustainable Choice
In the southeastern US, biomass harvesting is often integrated into existing operations. This isn’t just about energy; it’s about forest sustainability. Utilizing small diameter trees and logging residues—like branches and tops—can reduce site preparation costs and facilitate planting the next generation of trees, improve forest aesthetics, and reduce the need for burning.
Key Study Findings
The researchers examined 75 sites across Alabama, Florida, Georgia, Louisiana, and Mississippi to compare conventional pulpwood harvests with those supplying pellet mills.
- No Significant Difference in Clearcuts: There were no differences in erosion rates on landings, harvest areas, or haul roads between conventional and pellet-integrated clearcut harvests.
- Thinnings and In-Woods Chipping: While thinning operations using in-woods chipping showed slightly higher erosion in harvest areas, these rates remained within normal regional levels and were considered acceptable with proper BMP implementation.
- Universal Sustainability: In every treatment group, the estimated soil erosion rates were consistently very low and showed that the sites were able to maintain long-term site productivity for good tree growth.
Takeaways for Professionals and Policymakers
- BMPs are Effective: The study found that higher BMP implementation scores directly correlated with lower erosion rates. This reinforces that existing, state-approved BMPs are highly effective at protecting water quality, regardless of the end-market for the wood.
- No Need for New Regulations: The results support previous findings and suggest that in the study area current forestry water quality BMPs are sufficient to mitigate the risks of biomass harvesting. Additionally, restrictive “Biomass Harvesting Guidelines” (BHGs) are not necessary if current BMPs are strictly followed.
- Operational Excellence Matters: Professional foresters and loggers are already doing a great job—pellet harvest sites actually showed slightly higher BMP implementation scores (96.03%) than conventional sites (93.46%) in this study.
This work was supported and funded by the USDA National Institute of Food and Agriculture and the National Council for Air and Stream Improvement.
