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Multiyear precipitation reduction strongly decrease carbon uptake over North China.
- Source :
- Biogeosciences Discussions; 2013, Vol. 10 Issue 1, p1605-1634, 30p, 1 Chart, 5 Graphs, 5 Maps
- Publication Year :
- 2013
-
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<superscript>-1</superscript> 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<superscript>-1</superscript>. Multiple precipitation reduction changed the regional carbon uptake of 0.0014 Pg C yr<superscript>-1</superscript> from 1982 to 1998 to a net source of 0.018 Pg C yr<superscript>-1</superscript>. 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<superscript>-1</superscript> yr<superscript>-1</superscript>), Jilin (2180 kg ha<superscript>-1</superscript> yr<superscript>-1</superscript>), Tianjing (1923 kg ha<superscript>-1</superscript> yr<superscript>-1</superscript>) and Heilongjiang (1791 kg ha<superscript>-1</superscript> yr<superscript>-1</superscript>), 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- CARBON cycle
SOIL moisture
VEGETATION & climate
CROP yields
BIOTIC communities
Subjects
Details
- Language :
- English
- ISSN :
- 18106277
- Volume :
- 10
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Biogeosciences Discussions
- Publication Type :
- Academic Journal
- Accession number :
- 85950290
- Full Text :
- https://doi.org/10.5194/bgd-10-1605-2013