干旱区生态环境知识资源中心(Arid): Comparing the seasonal variation of parameter estimation of ecosystem carbon exchange between alpine meadow and cropland in Heihe River Basin, northwestern China

Arid

	Comparing the seasonal variation of parameter estimation of ecosystem carbon exchange between alpine meadow and cropland in Heihe River Basin, northwestern China
	Wang Haibo; Ma Mingguo
来源期刊	Sciences in Cold and Arid Regions
ISSN	1674-3822
出版年	2015
卷号	7 期号:3 页码:216-228
英文摘要	Grasslands and agro-ecosystems occupy one-third of the global terrestrial area. However, great uncertainty still exists about their contributions to the global carbon cycle. This study used various combinations of a simple ecosystem respiration model and a photosynthesis model to simulate the influence of different climate factors, specifically radiation, temperature, and moisture, on the ecosystem carbon exchange at two dissimilar study sites. Using a typical alpine meadow site in a cold region and a typical cropland site in an arid region as cases, we investigated the response characteristics of productivity of grasslands and croplands to different environmental factors, and analyzed the seasonal change patterns of different model parameters. Parameter estimations and uncertainty analyses were performed based on a Bayesian approach. Our results indicated that: (1) the net ecosystem exchange (NEE) of alpine meadow and seeded maize during the growing season presented obvious diurnal and seasonal variation patterns. On the whole, the alpine meadow and seeded maize ecosystems were both apparent sinks for atmospheric CO_2; (2) in the daytime, the mean NEE of the two ecosystems had the largest values in July and the lowest values in October. However, overall carbon uptake in the cropland was greater than in the alpine meadow from June to September; (3) at the alpine meadow site, temperature was the main limiting factor influencing the ecosystem carbon exchange variations during the growing season, while the sensitivity to water limitation was relatively small since there is abundant of rainfall in this region; (4) at the cropland site, both temperature and moisture were the most important limiting factors for the variations of ecosystem carbon exchanges during the growing season; and (5) some parameters had an obvious characteristic of seasonal patterns, while others had only small seasonal variations.
英文关键词	ecosystem carbon flux ecosystem respiration gross ecosystem productivity climatic factors alpine meadow farmland ecosystem
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Agriculture
CSCD记录号	CSCD:5444880
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335502
作者单位	Wang Haibo, Heihe Remote Sensing Experimental Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Key Laboratory of Remote Sensing of Gansu Province, Lanzhou, Gansu 730000, China.; Ma Mingguo, School of Geographical Sciences, Southwest University (Beibei District), Chongqing 400715.
推荐引用方式 GB/T 7714	Wang Haibo,Ma Mingguo. Comparing the seasonal variation of parameter estimation of ecosystem carbon exchange between alpine meadow and cropland in Heihe River Basin, northwestern China[J],2015,7(3):216-228.
APA	Wang Haibo,&Ma Mingguo.(2015).Comparing the seasonal variation of parameter estimation of ecosystem carbon exchange between alpine meadow and cropland in Heihe River Basin, northwestern China.Sciences in Cold and Arid Regions,7(3),216-228.
MLA	Wang Haibo,et al."Comparing the seasonal variation of parameter estimation of ecosystem carbon exchange between alpine meadow and cropland in Heihe River Basin, northwestern China".Sciences in Cold and Arid Regions 7.3(2015):216-228.