The Evapotranspiration and Energy Budget of an Achnatherum splendens Grassland in the Oasis-desert Ecotone in Xinjiang, China, during Summer and Autumn

doi:10.7522/j.issn.1000-694X.2013.00019

JOURNAL OF DESERT RESEARCH

2013, Vol. 33

Issue (1): 133-140 DOI: 10.7522/j.issn.1000-694X.2013.00019

Biology and Soil

The Evapotranspiration and Energy Budget of an Achnatherum splendens Grassland in the Oasis-desert Ecotone in Xinjiang, China, during Summer and Autumn

YAN Ren-hua1,2, XIONG Hei-gang3,2, ZHANG Fang1,2

1.College of Resource and Enviroment Sciences, Xinjiang University, Urumqi 830046, China;
2.Key Laboratory of Oasis Ecology, Xinjiang Univesity, Urumqi 830046, China;
3.Department of Urban Science, College of Applied Arts and Science of Beijing Union University, Beijing 100083, China

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Abstract

With the field observed meteorological data and the Bowen-ratio method, the evapotranspiration and energy balance in an Achnatherum splendens grassland in the oasis-desert ecotone in Xinjiang, China, were calculated during the summer and autumn of 2010. The results indicated that: (1) The diurnal evapotranspiration under different weather conditions varied significantly. Due to the strong radiation, the evapotranspirtion curve on the sunny days appeared as "towering" type, while the line in cloudy days manifested as "flatting" type in relation to the cloudiness and precipitation, and that in rainy days appeared as" skewing" type. (2) As the climate changes from summer to autumn, the occurring and ending time of the evapotranspiration within a day had some 1.73 min·d-1 lagging and 2.02 min·d-1 advancing, respectively, the evapotranspiration peak declined at a speed of 0.0036 min·d-1. Compared with the habitats of some plants with relatively wide leaf, the A. splendens grassland showed a smaller diurnal fluctuation of evapotranspiration. (3) The net radiation (Rn), latent heat flux (LE), sensible heat flux (H) and soil heat flux (G) had a similar diurnal changing trend. The curve of G/Rn, H/Rn and LE/Rn in daytime was smooth, however, it fluctuated continually at night, and the most violent fluctuation appeared at the time of sunrise and sunset. Latent heat accounted for 52.7% in net radiatio, which was much larger than that in desert and gobi, but smaller than that in oasis. (4) The intraday curve of β (Bowen ratio) demonstrated a downtrend by about -2%. But its daily variation curve represented slightly an upward trend by about 4.8. The downtrend indicated that the variation of latent heat activity would become stronger with time passing in the sunny days, while the upward trend showed that the intensity of the sensible heat activity would increases gradually with the date advancing from summer to autumn.

Key words: evapotranspiration oasis-desert ecotone the Bowen ratio energy balance method energy balance Achnatherum splendens

Received: 01 June 2012 Published: 20 January 2013

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	Articles by authors
	YAN Ren-hua1
	2
	XIONG Hei-gang3
	2
	ZHANG Fang1
	2

Cite this article:

YAN Ren-hua1,2, XIONG Hei-gang3,2, ZHANG Fang1,2. The Evapotranspiration and Energy Budget of an Achnatherum splendens Grassland in the Oasis-desert Ecotone in Xinjiang, China, during Summer and Autumn. JOURNAL OF DESERT RESEARCH, 2013, 33(1): 133-140.

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http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00019 OR http://www.desert.ac.cn/EN/Y2013/V33/I1/133

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