气候变化领域集成服务门户(CCPortal): Precipitation amount, seasonality and frequency regulate carbon cycling of a semi-arid grassland ecosystem in Inner Mongolia, China: A modeling analysis

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DOI	10.1016/j.agrformet.2013.02.002
	Precipitation amount, seasonality and frequency regulate carbon cycling of a semi-arid grassland ecosystem in Inner Mongolia, China: A modeling analysis
	Peng, Shushi; Piao, Shilong; Shen, Zehao; Ciais, Philippe; Sun, Zhenzhong; Chen, Shiping; Bacour, Cedric; Peylin, Philippe; Chen, Anping
通讯作者	Piao, SL (通讯作者)
发表日期	2013
ISSN	0168-1923
EISSN	1873-2240
起始页码	46
结束页码	55
卷号	178
英文摘要	Over the last century, precipitation has shown significant changes, reflecting both natural variability and radiative forcing changes from greenhouse gases and aerosols. Arid and semi-arid ecosystems are particularly sensitive to changes in precipitation regimes. In this study, we investigate how variation in annual total, seasonal distribution and frequency of precipitation affect CO2 fluxes of semi-arid grassland in Inner Mongolia. To this aim, we combine eddy-covariance measurements with a process-based model (ORCHIDEE). First, the ORCHIDEE parameters were optimized using half-hourly CO2 flux data and actual precipitation forcing. Second, the response of CO2 fluxes to altered precipitation scenarios is computed using the model with optimized parameters. Our results show that modeled net primary production (NPP) responds non-linearly to increased vs. decreased rainfall. Re-allocating precipitation from other seasons to spring enhances annual NPP and net ecosystem production (NEP). By contrast, re-allocating more precipitation to autumn was found to decrease annual NPP and NEP. Increasing the frequency of heavy rainfall days (PF10 (mm), days with precipitation more than 10 mm) induces a positive response of simulated NPP during the growing season. However, the increase of the frequency of moderately rainy days (PF5-10 mm, days with precipitation between 5 mm and 10 mm) rather increases soil heterotrophic respiration. Taken together, our modeling results are consistent with that of grassland field manipulation experiments. This study highlights the importance of changes in precipitation seasonality and frequency for semi-arid grassland. Further investigations should focus on testing the ability of models to reproduced manipulation experiment data, and on evaluating the performances of climate models to reproduce rainfall intensity/frequency in semi-arid areas. (c) 2013 Elsevier B.V. All rights reserved.
关键词	NET PRIMARY PRODUCTIVITY WATER DYNAMICS CLIMATE-CHANGE TEMPERATURE RESPONSES BIOMES CO2 VARIABILITY VEGETATION REDUCTION
英文关键词	Precipitation amount; Precipitation seasonality; Precipitation frequency; Grassland; Net primary production; Net ecosystem production; Heterotrophic respiration
语种	英语
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000322349800006
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
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/258233
推荐引用方式 GB/T 7714	Peng, Shushi,Piao, Shilong,Shen, Zehao,et al. Precipitation amount, seasonality and frequency regulate carbon cycling of a semi-arid grassland ecosystem in Inner Mongolia, China: A modeling analysis[J]. 中国科学院青藏高原研究所,2013,178.
APA	Peng, Shushi.,Piao, Shilong.,Shen, Zehao.,Ciais, Philippe.,Sun, Zhenzhong.,...&Chen, Anping.(2013).Precipitation amount, seasonality and frequency regulate carbon cycling of a semi-arid grassland ecosystem in Inner Mongolia, China: A modeling analysis.AGRICULTURAL AND FOREST METEOROLOGY,178.
MLA	Peng, Shushi,et al."Precipitation amount, seasonality and frequency regulate carbon cycling of a semi-arid grassland ecosystem in Inner Mongolia, China: A modeling analysis".AGRICULTURAL AND FOREST METEOROLOGY 178(2013).