Abstract
Xihu desert wetland is an important and unusual environment in China or even in the world. However, until now, little research has been focused on the microclimate and CO2 flux characteristics in this area. This paper reports the characteristics of daily variations of microclimate and CO2 flux in the Dunhuang Xihu desert wetland, based on data observed in the desert wetland during a period of continuous fine weather in summer 2012. Results indicate that the characteristics of the micrometeorology were significantly affected by the land–lake breeze during the study period, and updrafts were prevalent in this region. The friction wind speed and the vertical velocity were much greater than those in the Maqu grasslands. The energy budget was strongly imbalanced: the latent heat flux was significantly higher than the sensible flux. The daily mean values of total solar radiation and net radiation were larger than those in Maqu grasslands and Jinta oasis. There was a temperature inversion and inverse humidity gradient in the atmospheric surface layer at night. The desert wetland ecosystem was a carbon sink during the whole of the observation period, and the maximum rate of carbon absorption usually occurred at about 11:00 hr each day in this region.
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Ao Y H, Lv S H, Li S S, Zhang Y, Zhang S Q and Shang L Y 2008 The energy budget and microclimate over the upper Yellow River in summer fine days; J. Glaciol. Geocry. 30 426–432 (in Chinese).
Chen W Y, Zhang J Q, Zhao M, Wang Z G, Wu S X, Yuan H F, Kang J J, Sun F D and Wang Y H 2012 Species diversity characteristics of plant community in Xihu desert wetland of Dunhuang, Gansu province; J. Desert Res. 32 1639–1645 (in Chinese).
Falge E, Baldocchi D, Olson R, Anthoni P and Aubinet M 2001 Gap filling strategies for defensible annual sums of net ecosystem exchange; Agr. Forest. Meteorol. 107 43–69.
Foken T 2008 The energy balance closure problem: An overview; Ecol. Appl. 18 1351–1367.
Foken T and Wichura B 1996 Tools for quality assessment of surface-based flux measurements; Agric. For. Meteorol. 78 83–105.
Gao Z Q, Bian L G and Zhou X J 2003 Measurements of turbulent transfer in the near surface layer over a rice paddy in China; J. Geophys. Res. 108 4387–4399.
Gilmanov T G, Soussana J F, Aires L, Allard L, Ammann C, Balzarolo M, Barcza Z, Bernhofer C, Cescatti A, Campbell C L, Cernusca A, et al. 2007 Partitioning European grassland net ecosystem CO2 exchange into gross primary productivity and ecosystem respiration using light response function analysis. Agr. Ecosyst. Environ. 121, 93–120.
Hastings S J, Oechel W C and Muhlia-Melo A 2005 Diurnal, seasonal and annual variation in the net ecosystem CO2 exchange of a desert shrub community (Sarcocaulescent) in Baja California, Mexico; Global Change Biol. 11 927–939.
Hu Y Q, Yang X L, Zhang Q and Zuo H C 1992 The characters of energy budget on the Gobi and desert surface in Hexi region; Acta. Meteorol. Sin. 26 82–91 (in Chinese).
Huang J P, Guan X and Ji F 2012 Enhanced cold-season warming in semi-arid regions; Atmos. Chem. Phys. 12 5391–5398.
Ji G L, Ma X Y, Zou J L and Lv L Z 2003 Characteristics of the radiation budget over oases in arid Region; Arid Meteorol. 21 29–33 (in Chinese).
Lal R 2004 Carbon sequestration in dryland ecosystems; Environ. Manag. 33 528–544.
Lee X, Massman W J and Law B E 2004 Handbook of Micrometeorology: A guide for surface flux measurements; Kluwer Academic Publishers, Dordrecht, pp. 181–208.
Ma D, Lv S H, Ao Y H and Zhao L 2012 Analyses of radiation balance and surface energy budget in the Badain Jaran Desert in summer; Plateau Meteorol. 31 615–621 (in Chinese).
Maestre F T and Cortina J 2004 Do positive interactions increase with abiotic stress? A test from a semi-arid steppe; Proc. Roy. Soc. London B Suppl. 271 S331—S333.
McCaughey J H 1985 Energy balance storage terms in a mature mixed forest at Petawawa, Ontario – A case study; Bound.-Layer Meteorol. 31 89–101.
Midgley G F, Aranibar J N, Mantalana K B and Macko S 2004 Photosynthetic and gas exchange characteristics of dominant woody plants on a moisture gradient in an African savanna; Global Change Biol. 10 309–317.
Moore C J 1986 Frequency response corrections for eddy correlation systems; Bound.-Layer Meteorol. 37 17–35.
Qi D C, Chen W Y, Zhang J Q, Wu S X and Yuan H F 2010 Status, degraded causes and comprehensive treatment of Dunhuang Xihu wetland ecosystem; Acta Prat Acultura. Sinica 19 194–203 (in Chinese).
Reynolds J F 2001 Desertification; In: Encyclopedia of Biodiversity (ed.) Levin S, Academic Press, San Diego, pp. 61–78.
Schlesinger W H 1991 Biogeochemistry: An Analysis of Global Change; Academic Press, San Diego.
Schotanus P, Nieuwstadt F T M and De Bruin H A R 1983 Temperature measurement with a sonic anemometer and its application to heat and moisture fluxes; Bound.-Layer Meteorol. 26 81–93.
Valentini R, Dore S, Marchi G, Mollicone D, Panfyorov M, Rebmann C, Kolle O and Schulze E D 2000 Carbon and water exchanges of two contrasting central Siberia landscape types: Regenerating forest and bog; Funct. Ecol. 14 87–96.
Webb E K, Pearman G I and Leuning R 1980 Correction of flux measurements for density effects due to heat and water vapour transfer; Quart. J. Roy. Meteorol. Soc. 106 85–100.
Whittaker R H 1975 Communities and Ecosystems; MacMillan Publishing Co., New York.
Wilczak J M, Oncley S P and Stage S A 2001 Sonic anemometer tilt correction algorithms; Bound.-Layer Meteorol. 99 127–150.
Zhai P M and Zhang G C 2004 Climate change and meteorological disasters; Sci. Tech. Rev. 7 11–14 (in Chinese).
Zhang G S 2000 Research progress on trees and shrub drought-resistance and woodland water activity in arid and semi-arid region; J. Desert Res. 20 363–368 (in Chinese).
Zhang L, Dong Z C and Huang X L 2004 Modeling on relation between major plants growth and groundwater depth in arid area; J. Desert Res. 24 110–113 (in Chinese).
Zhang Q and Zhou Y 2002 The characteristics of budget of radiation and energy as well microclimate of Dunhuang oasis on a typical clear day in summer; Acta. Meteorol. Sin. 26 717–723 (in Chinese).
Zhang Y, Lv S H, Chen S Q, Ao Y H, Hu Z Y and Wei Z G 2005 Characteristics of energy budget and microclimate on the edge of oasis summer; Plateau Meteorol. 24 527–533 (in Chinese).
Zheng Y M, Cui G F, Lei T, Wu S X, Sun Z C and Yuan H F 2010 Community characteristics and population patterns of Tamarix ramosissima in Dunhuang Xihu of Gansu Province, northwestern China; J. Beijing Forestry Univ. 32 34–44 (in Chinese).
Acknowledgements
This work was supported by the National Science-Technology Support Plan Projects ‘Key techniques research and demonstration of ecological remediation of Dunhuang’ (2012BAC08B07). The authors sincerely thank Prof. Wang J M for his contribution during the data processing.
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Gou, QQ., Qu, JJ. & Han, ZW. Analysis of the microclimate and CO2 flux characteristics in arid desert wetland ecosystem in summer: A case study in Xihu desert wetland, Dunhuang, China. J Earth Syst Sci 123, 1491–1499 (2014). https://doi.org/10.1007/s12040-014-0491-3
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DOI: https://doi.org/10.1007/s12040-014-0491-3