Carbon balance for biosolids use in commercial Douglas Fir plantations in the Pacific Northwest.

Autor: Leonard E; School of Environment and Forest Sciences, University of Washington, Seattle, WA, USA., Bodas J; School of Environment and Forest Sciences, University of Washington, Seattle, WA, USA., Brown S; School of Environment and Forest Sciences, University of Washington, Seattle, WA, USA. Electronic address: slb@uw.edu., Axt B; Resource Recovery Division, King County, WA, USA.
Jazyk: angličtina
Zdroj: Journal of environmental management [J Environ Manage] 2021 Oct 01; Vol. 295, pp. 113115. Date of Electronic Publication: 2021 Jun 23.
DOI: 10.1016/j.jenvman.2021.113115
Abstrakt: Municipal biosolids are commonly used to fertilize Douglas fir (Pseudotsuga menziesii) plantations in the Pacific Northwest. An intensive soil sampling was conducted to quantify the effects of long-term biosolids application on soil carbon, nitrogen and bulk density for forest soils. This information was used to calculate a carbon balance for biosolids use in commercial tree plantations. Paired control and treated sites on two soil series (Klaus and Tokul) were included with samples collected to a 30 cm depth. A significant decrease in bulk density for two depths, but no changes in total C or N were observed in the Klaus soil. In the Tokul soil, biosolids fertilization increased C storage (total C * bulk density) for three of the four measured depths, resulting in an increase in total C from 112.8 Mg C ha -1 to 172 Mg C ha -1 for the 0-30 cm depth. A comparable increase in N was observed, with significant increases in N storage for all measured depths. The C balance considered fuel use associated with transport and application as costs. The fertilizer (N and P) content of the biosolids and changes in soil C were considered as credits. The balance showed net sequestration for both soil series. Carbon benefits for the Klaus soil totaled -0.2 Mg CO 2 per Mg biosolids. Benefits in the Tokul soil totaled -5.15 Mg CO 2 per Mg biosolids. Based on diameter at breast height (DBH) biosolids use also resulted in increased tree growth for both soil series. However, differences in stand age and stocking rate complicated interpretation of these results.
(Copyright © 2021. Published by Elsevier Ltd.)
Databáze: MEDLINE
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