IEECAS OpenIR  > 黄土与第四纪地质国家重点实验室(2010~)
Comparing the impact of cloudiness on carbon dioxide exchange in a grassland and a maize cropland in northwestern China
Bai, YF (Bai, Yanfen)[1,3]; Wang, J (Wang, Jian)[1]; Zhang, BC (Zhang, Baocheng)[2,3]; Zhang, ZH (Zhang, Zhihui)[1,3]; Liang, J (Liang, Ji)[1]
2012-05-30
Source PublicationECOLOGICAL RESEARCH
Volume27Issue:3Pages:615-623
Subtype期刊论文
Abstract

Light quantity and quality strongly influence plant growth. However, different ecosystems have different capabilities to assimilate solar radiation. In this study, the effects of cloudiness intensity on the net ecosystem exchange of carbon dioxide (NEE) were compared between an alpine grassland (with lower leaf area index) at A'Rou and an oasis maize cropland (with higher leaf area index) at Yingke, using flux data obtained during the middle of the growing season (July-August) in 2008 and 2009. The results showed that the response of NEE to photosynthetically active radiation (PAR) was more negative (carbon uptake) under cloudy than under clear skies at both sites. The maximum NEE occurred when the clearness index (CI) ranged from 0.4 to 0.7 under cloudy skies. The maximum enhancements were 11.9% for solar elevation angles of 60-65A degrees in the grassland, and 34.9% for solar elevation angles of 60-65A degrees and 10.3% for angles of 35-40A degrees in the maize cropland before the irrigation period. The response of NEE to CI changed slightly with solar elevation angle in the grassland compared to the maize cropland. The results indicate that enhanced NEE under cloudy skies can be attributed to increasingly diffuse PAR and interactions with environmental factors (air temperature and vapor pressure deficit).

KeywordClearness Index Diffuse Radiation Nee Photosynthetically Active Radiation (Par)
DOI10.1007/s11284-012-0930-z
Indexed BySCI
Language英语
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Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/10134
Collection黄土与第四纪地质国家重点实验室(2010~)
Corresponding AuthorBai, YF (Bai, Yanfen)[1,3]
Affiliation1.Cold and Arid Regions Environmental and Engineering ResearchInstitute, Chinese Academy of Sciences, Lanzhou 730000, China;
2.State Key Lab of Loess and Quaternary Geology,Institute of Earth Environment, Chinese Academyof Sciences, Xi’an 710075, China;
3.Graduate School of the Chinese Academy of Science,Beijing 100049, China
Recommended Citation
GB/T 7714
Bai, YF ,Wang, J ,Zhang, BC ,et al. Comparing the impact of cloudiness on carbon dioxide exchange in a grassland and a maize cropland in northwestern China[J]. ECOLOGICAL RESEARCH,2012,27(3):615-623.
APA Bai, YF ,Wang, J ,Zhang, BC ,Zhang, ZH ,&Liang, J .(2012).Comparing the impact of cloudiness on carbon dioxide exchange in a grassland and a maize cropland in northwestern China.ECOLOGICAL RESEARCH,27(3),615-623.
MLA Bai, YF ,et al."Comparing the impact of cloudiness on carbon dioxide exchange in a grassland and a maize cropland in northwestern China".ECOLOGICAL RESEARCH 27.3(2012):615-623.
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