TY - JOUR
T1 - Age-dependent forest carbon sink
T2 - Estimation via inverse modeling
AU - Zhou, Tao
AU - Shi, Peijun
AU - Jia, Gensuo
AU - Dai, Yongjiu
AU - Zhao, Xiang
AU - Shangguan, Wei
AU - Du, Ling
AU - Wu, Hao
AU - Luo, Yiqi
N1 - Funding Information:
In line with the AGU publications data policy, the sources of site-related data can be accessed in section "2.1 Assimilated data" and GIS-related data can be accessed in section "2.2 Model drivers." The authors greatly appreciated constructive comments on the paper by Jianyang Xia, Junyi Liang, and Zheng Shi. This work was supported by the National Natural Science Foundation of China (41321001 and 41571185), the National Basic Research Program of China (2012CB955401), the New Century Excellent Talents in University (NCET-10-0251), and the Fundamental Research Funds for the Central Universities (2015KJJCB33). Y.L. was financially supported by U.S. Department of Energy, Terrestrial Ecosystem Sciences grant DE SC0008270 and U.S. National Science Foundation (NSF) grants DEB 0743778, DEB 0840964, EPS 0919466, and EF 1137293.
Publisher Copyright:
©2015. American Geophysical Union. All Rights Reserved.
PY - 2015/12
Y1 - 2015/12
N2 - Forests have been recognized to sequester a substantial amount of carbon (C) from the atmosphere. However, considerable uncertainty remains regarding the magnitude and time course of the C sink. Revealing the intrinsic relationship between forest age and C sink is crucial for reducing uncertainties in prediction of forest C sink potential. In this study, we developed a stepwise data assimilation approach to combine a process-based Terrestrial ECOsystem Regional model, observations from multiple sources, and stochastic sampling to inversely estimate carbon cycle parameters including carbon sink at different forest ages for evergreen needle-leaved forests in China. The new approach is effective to estimate age-dependent parameter of maximal light-use efficiency (R2 = 0.99) and, accordingly, can quantify a relationship between forest age and the vegetation and soil C sinks. The estimated ecosystem C sink increases rapidly with age, peaks at 0.451 kg C m-2 yr-1 at age 22 years (ranging from 0.421 to 0.465 kg C m-2 yr-1), and gradually decreases thereafter. The dynamic patterns of C sinks in vegetation and soil are significantly different. C sink in vegetation first increases rapidly with age and then decreases. C sink in soil, however, increases continuously with age; it acts as a C source when the age is less than 20 years, after which it acts as a sink. For the evergreen needle-leaved forest, the highest C sink efficiency (i.e., C sink per unit net primary productivity) is approximately 60%, with age between 11 and 43 years. Overall, the inverse estimation of carbon cycle parameters can make reasonable estimates of age-dependent C sequestration in forests.
AB - Forests have been recognized to sequester a substantial amount of carbon (C) from the atmosphere. However, considerable uncertainty remains regarding the magnitude and time course of the C sink. Revealing the intrinsic relationship between forest age and C sink is crucial for reducing uncertainties in prediction of forest C sink potential. In this study, we developed a stepwise data assimilation approach to combine a process-based Terrestrial ECOsystem Regional model, observations from multiple sources, and stochastic sampling to inversely estimate carbon cycle parameters including carbon sink at different forest ages for evergreen needle-leaved forests in China. The new approach is effective to estimate age-dependent parameter of maximal light-use efficiency (R2 = 0.99) and, accordingly, can quantify a relationship between forest age and the vegetation and soil C sinks. The estimated ecosystem C sink increases rapidly with age, peaks at 0.451 kg C m-2 yr-1 at age 22 years (ranging from 0.421 to 0.465 kg C m-2 yr-1), and gradually decreases thereafter. The dynamic patterns of C sinks in vegetation and soil are significantly different. C sink in vegetation first increases rapidly with age and then decreases. C sink in soil, however, increases continuously with age; it acts as a C source when the age is less than 20 years, after which it acts as a sink. For the evergreen needle-leaved forest, the highest C sink efficiency (i.e., C sink per unit net primary productivity) is approximately 60%, with age between 11 and 43 years. Overall, the inverse estimation of carbon cycle parameters can make reasonable estimates of age-dependent C sequestration in forests.
KW - China
KW - carbon management
KW - data assimilation
KW - forest age
KW - forest carbon sink
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U2 - 10.1002/2015JG002943
DO - 10.1002/2015JG002943
M3 - Article
AN - SCOPUS:84954560144
SN - 2169-8953
VL - 120
SP - 2473
EP - 2492
JO - Journal of Geophysical Research: Biogeosciences
JF - Journal of Geophysical Research: Biogeosciences
IS - 12
ER -