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Responses of soil evaporation rates to air temperature and air humidity on farmland in Linzhi, Tibet
LIU He-man, CAO Li-hua, MA He-ping
1. Tibet Agriculture and Animal Husbandry College, Linzhi 860000, China; 2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling 712100, China; 3. College of Resources and Environmental, China agricultural University, Beijing 100193, China
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Abstract  

Soil evaporation is a key factor of moisture migration and water cycling at the soil-air interface and strongly influenced by temperature and humidity. To elucidate the relationships between soil evaporation rate and air temperature and humidity, the air temperature and humidity and soil evaporation rate at Linzhi farmland were studied using the H2O/CO2 flux instrument. The relationships of soil evaporation and air temperature and humidity were estimated by correlation analysis. Results showed that the diurnal variation of soil evaporation rate could be expressed as a single-peak curve, and the peak value and valley value of Re appeared at 14:00-15:00 and early morning respectively. The air temperature and humidity variations were the same to Re. The evaporation rate had a significantly positive correlation to the air temperature (R>0.9, P<0.001) and air humidity (R>0.7, P<0.001).

Key wordsLinzhi      Soil evaporation rate      Air temperature      Air humidity     
Received: 25 April 2013     
:  S152.7+3  
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LIU He-man
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LIU He-man,CAO Li-hua,MA He-ping. Responses of soil evaporation rates to air temperature and air humidity on farmland in Linzhi, Tibet[J]. , 2013, 32(2): 241-245.
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http://www.ecolsci.com/EN/     OR     http://www.ecolsci.com/EN/Y2013/V32/I2/241
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