Difference of Actual Evapotranspiration Measured by Two Sizes Lysimeters

doi:10.7522/j.issn.1000-694X.2015.00230

JOURNAL OF DESERT RESEARCH ›› 2017, Vol. 37 ›› Issue (1): 167-174.DOI: 10.7522/j.issn.1000-694X.2015.00230

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Difference of Actual Evapotranspiration Measured by Two Sizes Lysimeters

Yang Qiguo^1,2, Yang Xingguo², Zhang Xudong³, Ma Pengli³, Liu Hongyi², Li Xiaofeng⁴, Dang Xuanfa⁴, Kong Lingwang⁴

1. Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province/Key Open Laboratory of Arid Climatic Change and Reducing Disaster of China Meteorology Administration, Lanzhou Institute of Arid Meteorology, China Meteorology Administration, Lanzhou 730020, China;
2. Gansu Provincial Meteorological Bureau, Lanzhou 730020, China;
3. Northwest Regional Climate Center, Gansu Provincial Meteorological Bureau, Lanzhou 730020, China;
4. Meteorological Information and Technological Equipment Support Center of Gansu, Gansu Provincial Meteorological Bureau, Lanzhou 730020, China

Received:2015-08-19 Revised:2015-10-16 Online:2017-01-20 Published:2017-01-20

Abstract

Abstract: Based on observed data, the difference of actual evapotranspiration and its causes are analyzed by comparing the lysimeter with evaporation area of 2 square meters ( referred to as 2 m² lysimeter) and the lysimeter with evaporation area of 4 square meters (referred to as 4 m² lysimeter). The results showed that measured evapotranspiration by two lysimeters was in good consistency, but the 2 m² lysimeter's evapotranspiration was generally slightly larger than the 4 m² lysimeter with 4% more for daily evapotranspiration, 10% more for monthly evapotranspiration, and 5% more for annual evapotranspiration; Under different types of synoptic conditions, the two lysimeter's evapotranspiration had a same diurnal variation. In sunny days and cloudy days, hourly evapotranspiration measured by the 2 m² lysimeter was larger than 4 m² lysimeter during the day, but slightly smaller or very close during the night. The hourly evapotranspiration measured by the two lysimeters was very close in the rainy days. The daily evapotranspiration measured by the 2 m² lysimeter is 1.78 mm more than the 4 m² lysimeter in the sunny days and 0.12 mm more in the cloudy days, respectively, and 0.11 mm less in the rainy days; Analysis the reasons for the 2 m² lysimeter measured evapotranspiration is generally slightly larger than 4 m² lysimeter, on the one hand, the soil temperature of 2 m² lysimeter is significantly higher than that of 4 m² lysimeter. On the other hand, it can be the different construction time of two sizes of lysimeters caused the soil moisture to produce difference,resulted in the difference of evapotranspiration.

Key words: lysimeter, evapotranspiration, soil temperature, soil moisture, difference

CLC Number:

P332.2

Yang Qiguo, Yang Xingguo, Zhang Xudong, Ma Pengli, Liu Hongyi, Li Xiaofeng, Dang Xuanfa, Kong Lingwang. Difference of Actual Evapotranspiration Measured by Two Sizes Lysimeters[J]. JOURNAL OF DESERT RESEARCH, 2017, 37(1): 167-174.

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Difference of Actual Evapotranspiration Measured by Two Sizes Lysimeters

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