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Journal of Arid Land  2015, Vol. 7 Issue (2): 272-284    DOI: 10.1007/s40333-014-0012-x
Brief Communication     
Seasonal and inter-annual variations in carbon fluxes and evapotranspiration over cotton field under drip irrigation with plastic mulch in an arid region of Northwest China
Jie BAI1, Jin WANG2, Xi CHEN1, GePing LUO1, Hao SHI3, LongHui LI3, JunLi LI1
1 State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences,
Urumqi 830011, China;
2 Wulanwusu Agrometeorological Experiment Station, Shihezi Meteorological Administration, Shihezi 832003, China;
3 Plant Functional Biology & Climate Change Cluster, University of Technology, Sydney, NSW 2007, Australia
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Abstract  Xinjiang is the largest semi-arid and arid region in China, and drip irrigation under plastic mulch is widely used in this water-limited area. Quantifying carbon and water fluxes as well as investigating their environmental drivers over cotton fields is critical for understanding regional carbon and water budgets in Xinjiang, the largest cotton production basin of China. In this study, an eddy covariance (EC) technique was used to measure the carbon and water fluxes of cotton field under drip irrigation with plastic mulch in the growing seasons of 2009, 2010, 2012 and 2013 at Wulanwusu Agrometeorological Experiment Station, a representative oasis cropland in northern Xinjiang. The diurnal patterns of gross primary production (GPP), net ecosystem exchange (NEE) and evapotranspiration (ET) showed obviously sinusoidal variations from June to September, while the diurnal ecosystem respiration (Res) was stable between daytime and nighttime. The daytime hourly GPP and ET dis-played asymptotic relationships with net solar radiation (Rnet), while showed concave patterns with raising vapor pressure deficit (VPD) and air temperature (Ta). The increases in hourly GPP and ET towards the maximum occurred over half ranges of VPD and Ta. The seasonal variations of GPP, NEE and ET were close to the cotton phenology, which almost reached the peak value in July. The cumulative GPP averaged 816.2±55.0 g C/m2 in the growing season (from April to October), and more than half of GPP was partitioned into NEE (mean value of –478.6±41.4 g C/m2). The mean seasonal ET was 501.3±13.9 mm, and the mean water use efficiency (WUE) was 1.0±0.1 (mg C/g H2O)/d. The agro-ecosystem behaved as a carbon sink from squaring to harvest period, while it acted as a carbon source before the squaring time as well as after the harvest time.

Key wordsarbuscular mycorrhizal fungi      biotechnology      isolation      characterization      desert ecosystem      Arabian Peninsula      Oman     
Received: 31 March 2014      Published: 10 April 2015

This work was supported by the West Light Foundation of the Chinese Academy of Sciences (XBBS201110), the National Natural Science Foundation of China (41101101) and the Chi-nese Academy of Sciences Key Deployment Project (KZZD- EW-08-02-02).

Corresponding Authors: Jie BAI      E-mail:
Cite this article:

Jie BAI, Jin WANG, Xi CHEN, GePing LUO, Hao SHI, LongHui LI, JunLi LI. Seasonal and inter-annual variations in carbon fluxes and evapotranspiration over cotton field under drip irrigation with plastic mulch in an arid region of Northwest China. Journal of Arid Land, 2015, 7(2): 272-284.

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