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Energy and CO2 exchanges and influencing factors in spring wheat ecosystem along the Heihe River, northwestern China
Sun, Shuchen1,2,4; Shao, Ming'an1,2,3; Gao, Hongbei5
2016-12-01
Source PublicationJOURNAL OF EARTH SYSTEM SCIENCE
ISSN0253-4126
Volume125Issue:8Pages:1667-1679
Corresponding AuthorShao, Ming'an(mashao@ms.iswc.ac.cn)
AbstractSpring wheat (Triticum aestivum Linn.) is an important crop for food security in the desert-oasis farmland in the middle reaches of the Heihe River in northwestern China. We measured fluxes using eddy covariance and meteorological parameters to explore the energy fluxes and the relationship between CO2 flux and climate change in this region during the wheat growing seasons in 2013 and 2014. The energy balance closures were 70.5% and 72.7% in the 2013 and 2014 growing season, respectively. The wheat ecosystem had distinct seasonal and diurnal dynamics of CO2 fluxes with U-shaped curves. The accumulated net ecosystemic CO2 exchanges (NEE) were -111.6 and -142.2 g C/m(2) in 2013 and 2014 growing season, respectively. The ecosystem generally acted as a CO2 sink during the growing season but became a CO2 source after the wheat harvest. A correlation analysis indicated that night-time CO2 fluxes were exponentially dependent on air temperature and soil temperature at a depth of 5 cm but were not correlated with soil-water content, water-vapour pressure, or vapour-pressure deficit. CO2 flux was not correlated with the meteorological parameters during daytime. However, irrigation and precipitation, may complicate the response of CO2 fluxes to other meteorological parameters.
KeywordEddy covariance energy and CO2 fluxes desert-oasis ecotone spring wheat
DOI10.1007/s12040-016-0750-6
WOS KeywordCARBON-DIOXIDE FLUXES ; TEMPERATE DECIDUOUS FOREST ; WINTER-WHEAT ; SOIL RESPIRATION ; BALANCE CLOSURE ; HEAT FLUXES ; WATER ; CLIMATE ; GRASSLAND ; RESPONSES
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[91025018]
Funding OrganizationNational Natural Science Foundation of China
WOS Research AreaGeology ; Science & Technology - Other Topics
WOS SubjectGeosciences, Multidisciplinary ; Multidisciplinary Sciences
WOS IDWOS:000390038600012
PublisherINDIAN ACAD SCIENCES
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/65248
Collection中国科学院地理科学与资源研究所
Corresponding AuthorShao, Ming'an
Affiliation1.Chinese Acad Sci, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
2.Minist Water Resources, Yangling 712100, Shaanxi, Peoples R China
3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100049, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Shaanxi Prov Land Engn Construct Grp Co Ltd, Xian 710075, Shaanxi, Peoples R China
Recommended Citation
GB/T 7714
Sun, Shuchen,Shao, Ming'an,Gao, Hongbei. Energy and CO2 exchanges and influencing factors in spring wheat ecosystem along the Heihe River, northwestern China[J]. JOURNAL OF EARTH SYSTEM SCIENCE,2016,125(8):1667-1679.
APA Sun, Shuchen,Shao, Ming'an,&Gao, Hongbei.(2016).Energy and CO2 exchanges and influencing factors in spring wheat ecosystem along the Heihe River, northwestern China.JOURNAL OF EARTH SYSTEM SCIENCE,125(8),1667-1679.
MLA Sun, Shuchen,et al."Energy and CO2 exchanges and influencing factors in spring wheat ecosystem along the Heihe River, northwestern China".JOURNAL OF EARTH SYSTEM SCIENCE 125.8(2016):1667-1679.
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