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| Characteristics of Energy Balance of Riparian Tamarix Shrubs in Desert |
| Ma Hong1,2, Chen Yaning2, Li Weihong2 |
1. College of Grassland and Environment Sciences, Xinjiang Agricultural University, Urumqi 830052, China;
2. State key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese academy of Sciences, Urumqi 830011, China |
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Abstract In this research, the lower reaches of Tarim River, Xinjiang, was taken as target area and Tamarix shrubs were observed with the eddy covariance method during a whole growing season. Based on the synchronous meteorological data, the ground micrometeorological and energy balance of Tamarix shrubs under the drought stress environment were discussed; the differences between diurnal variations of energy balance and energy partitioning in different weather conditions were analyzed by using the ordinary least squares linear regression and the energy balance ratio method. The results showed that: the energy balance radio of Tamarix shrubs during the observation period was 72.3%, and the diurnal variation of surface energy flux and energy allocation trend appeared a single peak quadratic curve. Rn and LE was important energy income and expenditure terms of Tamarix shrubs, respectively. Energy balance residuals appeared systematic diurnal cycle alternating with negative and positive value. There was a significant difference in conversion of energy allocation and energy balance under different weather condition; the energy closure condition of fine day was better than the cloudy, rainy and windy day; and it was better during the day time than night. There was a significant change in the energy balance radio between before sunrise and after sunset and appeared instantaneous energy closure phenomenon. By affecting of photosynthesis, the magnitude of energy balance closure degree and changes of carbon flux had close relations with the air temperature and moisture degree under the different weather condition. These results suggested that the main reason which was resulted in the imbalance of energy balance radio was the underestimation of carbon flux.
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Received: 17 January 2013
Published: 20 January 2014
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Corresponding Authors:
陈亚宁，chenyn@ms.xjb.ac.cn
E-mail: chenyn@ms.xjb.ac.cn
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2014, Vol. 34 
