Critical land change information enhances the understanding of carbon balance in the United States

© 2020 John Wiley & Sons Ltd..

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.

Medienart:

E-Artikel

Erscheinungsjahr:

2020

Erschienen:

2020

Enthalten in:

Zur Gesamtaufnahme - volume:26

Enthalten in:

Global change biology - 26(2020), 7 vom: 26. Juli, Seite 3920-3929

Sprache:

Englisch

Beteiligte Personen:

Liu, Jinxun [VerfasserIn]
Sleeter, Benjamin M [VerfasserIn]
Zhu, Zhiliang [VerfasserIn]
Loveland, Thomas R [VerfasserIn]
Sohl, Terry [VerfasserIn]
Howard, Stephen M [VerfasserIn]
Key, Carl H [VerfasserIn]
Hawbaker, Todd [VerfasserIn]
Liu, Shuguang [VerfasserIn]
Reed, Bradley [VerfasserIn]
Cochrane, Mark A [VerfasserIn]
Heath, Linda S [VerfasserIn]
Jiang, Hong [VerfasserIn]
Price, David T [VerfasserIn]
Chen, Jing M [VerfasserIn]
Zhou, Decheng [VerfasserIn]
Bliss, Norman B [VerfasserIn]
Wilson, Tamara [VerfasserIn]
Sherba, Jason [VerfasserIn]
Zhu, Qiuan [VerfasserIn]
Luo, Yiqi [VerfasserIn]
Poulter, Benjamin [VerfasserIn]

Links:

Volltext

Themen:

7440-44-0
Carbon
Carbon sequestration
DGVM
Ecosystem model
Ecosystem productivity
Journal Article
Land use and land cover change
Wildfire

Anmerkungen:

Date Completed 26.11.2020

Date Revised 26.11.2020

published: Print-Electronic

Citation Status MEDLINE

doi:

10.1111/gcb.15079

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM307506282