气候变化领域集成服务门户(CCPortal): Twentieth-Century Droughts and Their Impacts on Terrestrial Carbon Cycling in China

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DOI	10.1175/2009EI275.1
	Twentieth-Century Droughts and Their Impacts on Terrestrial Carbon Cycling in China
	Xiao, Jingfeng; Zhuang, Qianlai; Liang, Eryuan; McGuire, A. David; Moody, Aaron; Kicklighter, David W.; Shao, Xuemei; Melillo, Jerry M.
通讯作者	Xiao, JF (通讯作者)
发表日期	2009
EISSN	1087-3562
卷号	13
英文摘要	Midlatitude regions experienced frequent droughts during the twentieth century, but their impacts on terrestrial carbon balance are unclear. This paper presents a century-scale study of drought effects on the carbon balance of terrestrial ecosystems in China. The authors first characterized the severe extended droughts over the period 1901-2002 using the Palmer drought severity index and then examined how these droughts affected the terrestrial carbon dynamics using tree-ring width chronologies and a process-based biogeochemistry model, the Terrestrial Ecosystem Model (TEM). It is found that China suffered from a series of severe extended droughts during the twentieth century. The major drought periods included 1920-30, 1939-47, 1956-58, 1960-63, 1965 68, 1978-80, and 1999-2002. Most droughts generally reduced net primary productivity (NPP) and net ecosystem productivity (NEP) in large parts of drought-affected areas. Moreover, some of the droughts substantially reduced the countrywide annual NPP and NEP. Out of the seven droughts, three (1920 30, 1965-68, and 1978-80) caused the countrywide terrestrial ecosystems to switch from a carbon sink to a source, and one (1960-63) substantially reduced the magnitude of the countrywide terrestrial carbon sink. Strong decreases in NPP were mainly responsible for the anomalies in annual NEP during these drought periods. Changes in heterotrophic respiration happened in the same direction, but mostly with smaller magnitude. The results show that severe extended droughts had significant effects on terrestrial carbon cycling in China, although future studies should consider other important processes such as drought-induced mortality and regrowth, land-use change, disturbances (e.g., fire), human management (e.g., fertilization and irrigation), and environmental pollution (e.g., ozone pollution, nitrogen deposition). These drought effects are of particular importance in light of projected widespread summer drying in midlatitude regions during the twenty-first century. Future droughts could lead to a reduced terrestrial carbon sink or even a source and exert a positive feedback to the global climate system.
关键词	NET PRIMARY PRODUCTIVITY WATER-VAPOR EXCHANGE LEAF-AREA INDEX TREE-RINGS ATMOSPHERIC CO2 SEVERITY INDEX SOIL-MOISTURE CLIMATE VARIABILITY UNITED-STATES ELEVATED CO2
英文关键词	Drought; Carbon cycling; Modeling
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000271090800001
来源期刊	EARTH INTERACTIONS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257717
推荐引用方式 GB/T 7714	Xiao, Jingfeng,Zhuang, Qianlai,Liang, Eryuan,et al. Twentieth-Century Droughts and Their Impacts on Terrestrial Carbon Cycling in China[J]. 中国科学院青藏高原研究所,2009,13.
APA	Xiao, Jingfeng.,Zhuang, Qianlai.,Liang, Eryuan.,McGuire, A. David.,Moody, Aaron.,...&Melillo, Jerry M..(2009).Twentieth-Century Droughts and Their Impacts on Terrestrial Carbon Cycling in China.EARTH INTERACTIONS,13.
MLA	Xiao, Jingfeng,et al."Twentieth-Century Droughts and Their Impacts on Terrestrial Carbon Cycling in China".EARTH INTERACTIONS 13(2009).