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- Title
Multiyear precipitation reduction strongly decrease carbon uptake over North China.
- Authors
Yuan, W. P.; Liu, D.; Dong, W. J.; Liu, S. G.; Zhou, G. S.; Yu, G. R.; Zhao, T. B.; Feng, J. M.; Ma, Z. G.; Chen, J. Q.; Chen, Y.; Chen, S. P.; Han, S. J.; Huang, J. P.; Li, L. H.; Liu, H. Z.; Liu, S. M.; Ma, M. G.; Wang, Y. F.; Xia, J. Z.
- Abstract
Drought has been a concern of global and regional water, carbon and energy cycles. From 1999 to 2011, North China experienced a multiyear precipitation reduction, which decreased significantly water availability as indicated by decreased soil moisture and Palmer Drought Severity Index. In this study, three light use efficiency models (CASA, MODIS-GPP and EC-LUE) and one dynamic vegetation model (IBIS) were used to characterize the impacts of long-term drought on terrestrial carbon fluxes over the North China. All of four models showed the reduction in averaged GPP of 0.026-0.047 Pg C yr-1 from 1999 to 2011 compared to 1982-2011. Based on IBIS model, simulated ecosystem respiration fell from 1999 to 2011 by 0.016 Pg C yr-1. Multiple precipitation reduction changed the regional carbon uptake of 0.0014 Pg C yr-1 from 1982 to 1998 to a net source of 0.018 Pg C yr-1. Moreover, a pronounced decrease of maize yield was found ranging from 1999 to 2011 versus the average of 1978-2011 at almost all provinces over the study region. The largest reduction of maize yield occurred in the Beijing (2499 kg ha-1 yr-1), Jilin (2180 kg ha-1 yr-1), Tianjing (1923 kg ha-1 yr-1) and Heilongjiang (1791 kg ha-1 yr-1), and maize yield anomaly was significantly correlated with the precipitation through May and September over the entire study area. Our results revealed that recent climate change, and especially drought-induced water stress, is the dominant cause of the reduction in the terrestrial carbon sink.
- Subjects
CHINA; CARBON cycle; SOIL moisture; VEGETATION &; climate; CROP yields; BIOTIC communities
- Publication
Biogeosciences Discussions, 2013, Vol 10, Issue 1, p1605
- ISSN
1810-6277
- Publication type
Article
- DOI
10.5194/bgd-10-1605-2013