Carbon dynamics of temperate grassland ecosystems in China from 1951 to 2007: an analysis with a process-based biogeochemistry model

doi:10.1007/s12665-012-1756-2

	Carbon dynamics of temperate grassland ecosystems in China from 1951 to 2007: an analysis with a process-based biogeochemistry model
	Sui, Xinghua 1; Zhou, Guangsheng 2
	2013
发表期刊	ENVIRONMENTAL EARTH SCIENCES
ISSN	1866-6280
卷号	68 期号:2 页码:521-533
摘要	Grasslands account for 40 % of the Chinese land area. About 80 % of the total grasslands are in the northern temperate zone. These grassland ecosystems provide goods and services to the local people and play an important role in the global carbon cycle. Remote sensing and ecosystem modeling approaches have been used to quantify the carbon budget of these grasslands. However, the intensive site measurements and meteorological data acquired in these ecosystems in the last few decades have not been adequately used to improve ecosystem model capabilities, in turn, better quantify their carbon budget. In this study an effort was made to examine the carbon budget and its spatial-temporal variation of the temperate grasslands in China from 1951 to 2007 using a process-based biogeochemistry model. It was found that the regional grasslands acted as a small carbon sink at 11.25 g C m(-2) year(-1) in the study area of 64.96 million hectares with a high inter-annual variability ranging from -124 to 122.7 g C m(-2) year(-1) during the study period. As a result, the temperate grasslands sequestered about 410 Tg C in their vegetation and soils during the study period. The carbon sink occurred in typical steppe in central Inner Mongolia within the 300-400 mm rainfall zone and forest steppe in central and western China. By contrast, forest steppe in northeastern China mainly acted as a carbon source. Three major ecosystem types of forest steppe, typical steppe and desert steppe account for 54, 34, and 12 % of the total sink (7.3 Tg C year(-1)) during 1951-2007, respectively. Soil moisture and evapotranspiration had a dominant effect on carbon budget in the typical steppe and the forest steppe while both water conditions and nitrogen mineralization rate were the major factors in the desert steppe. At a decadal scale, the air temperature significantly increased by 0.4 A degrees C and annual precipitation insignificantly decreased by 0.2 mm; the regional carbon sink increased by 2.2 Tg C per decade during the period 1951-2007. However, further sensitivity analysis suggests that the sink of temperate grasslands will be reduced if the climate gets warmer and drier during this century since the increasing net primary production does not keep up with the increase of heterotrophic respiration.
关键词	Temperate grassland Carbon budget Model Spatial-temporal variation Simulation
学科领域	Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources
DOI	10.1007/s12665-012-1756-2
收录类别	SCI
语种	英语
WOS关键词	NET PRIMARY PRODUCTIVITY ; INNER-MONGOLIA ; TERRESTRIAL ECOSYSTEMS ; DIOXIDE EXCHANGE ; SOIL ; STORAGE ; RESPIRATION ; VEGETATION ; RESPONSES ; SENSITIVITY
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000313059400015
出版者	SPRINGER
文献子类	Article
出版地	NEW YORK
EISSN	1866-6299
资助机构	National Natural Science Foundation of China(National Natural Science Foundation of China (NSFC)) ; Chinese Academy of Sciences(Chinese Academy of Sciences) ; NASA(National Aeronautics & Space Administration (NASA))
作者邮箱	SUI, Xinghua/B-9675-2008
引用统计	被引频次：20[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/27978
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China 3.Chinese Acad Meteorol Sci, China Meteorol Adm, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Sui, Xinghua,Zhou, Guangsheng. Carbon dynamics of temperate grassland ecosystems in China from 1951 to 2007: an analysis with a process-based biogeochemistry model[J]. ENVIRONMENTAL EARTH SCIENCES,2013,68(2):521-533.
APA	Sui, Xinghua,&Zhou, Guangsheng.(2013).Carbon dynamics of temperate grassland ecosystems in China from 1951 to 2007: an analysis with a process-based biogeochemistry model.ENVIRONMENTAL EARTH SCIENCES,68(2),521-533.
MLA	Sui, Xinghua,et al."Carbon dynamics of temperate grassland ecosystems in China from 1951 to 2007: an analysis with a process-based biogeochemistry model".ENVIRONMENTAL EARTH SCIENCES 68.2(2013):521-533.

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