Critical land change information enhances the understanding of carbon balance in the United States
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Abstract
Large-scale terrestrial carbon (C) estimating studies using methods such as atmospheric inversion, biogeochemical modeling, and field inventories have produced different results. The goal of this study was to integrate fine-scale processes including land use and land cover change into a large-scale ecosystem framework. We analyzed the terrestrial C budget of the conterminous United States from 1971 to 2015 at 1-km resolution using an enhanced dynamic global vegetation model and comprehensive land cover change data. Effects of atmospheric CO2 fertilization, nitrogen deposition, climate, wildland fire, harvest, and land use/land cover change (LUCC) were considered. We estimate annual C losses from cropland harvest, forest clearcut and thinning, fire, and LUCC were 436.8, 117.9, 10.5, and 10.4 TgC/year, respectively. C stored in ecosystems increased from 119,494 to 127,157 TgC between 1971 and 2015, indicating a mean annual net C sink of 170.3 TgC/year. Although ecosystem net primary production increased by approximately 12.3 TgC/year, most of it was offset by increased C loss from harvest and natural disturbance and increased ecosystem respiration related to forest aging. As a result, the strength of the overall ecosystem C sink did not increase over time. Our modeled results indicate the conterminous US C sink was about 30% smaller than previous modeling studies, but converged more closely with inventory data.
Study Area
Publication type | Article |
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Publication Subtype | Journal Article |
Title | Critical land change information enhances the understanding of carbon balance in the United States |
Series title | Global Change Biology |
DOI | 10.1111/gcb.15079 |
Volume | 26 |
Issue | 27 |
Year Published | 2020 |
Language | English |
Publisher | Wiley |
Contributing office(s) | Earth Resources Observation and Science (EROS) Center, Western Geographic Science Center |
Description | 10 p. |
First page | 3920 |
Last page | 3929 |
Country | United States |
Google Analytic Metrics | Metrics page |