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2019 Vol.52, Issue 3 Preview Page

Original research article

Verification of Reference Evapotranspiration Estimated by Weighable Lysimeters and Its Applicability
Dong-Jin Kim1
,
Kyung-Hwa Han1
,
Yong-Seon Zhang1
,
Hee-Rae Cho1
,
Seon-Ah Hwang1
,
Jung-Hun Ok1*
1Division of Soil and Fertilizer, National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Korea
* Corresponding Author
31 August 2019. pp. 284-296
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Abstract

The reference evapotranspiration (ET0) is an essential indicator in explaining the water movement in the environment. In this study, we carried out to investigate the ET0, which were LYET (reference evapotranspiration calculated by the weighable lysimeter), PMET (reference evapotranspiration calculated by the FAO Penman- Monteith equation), and HSET (reference evapotranspiration calculated by the Hargreaves equation), respectively, and to estimate the relationship among the LYET, PMET, and HSET by regression analysis. Turfgrass was selected as the reference crop for calculating the ET0 by the lysimeters. The experiment period was from 1st June to 31st December in 2015. The ET0 in the lysimeter study area (National Institute of Agricultural Sciences, Wanju; WJ) was compared with that in the nearby Jeonju (JJ) location because of similar weather conditions. The relationship between PMET-WJ and PMET-JJ has the slope of 1.138, the coefficient of determination (R2) of 0.972, and the relationship between HSET-WJ and HSET-JJ has a slope of 0.934 (R2=0.984); thus the fitness was high in both cases. The relationship between LYET and PMET in both soils (fine loamy, FL; coarse loamy, CL) showed a relatively high R2 as higher than 0.9, whereas the relationship between LYET and HSET showed relatively low fitness (0.676 - 0.736 of R2). According to the month, the fitness of PMET:LYET was higher than that of HSET:LYET, and in November and December, the R2 of PMET:LYET was lowered to 0.7 or less as turfgrass entered into a dormant stage. The LYET, PMET, and HSET were found to have significantly high positive correlations with the minimum temperature, maximum temperature, mean temperature, and solar radiation (p < 0.01) and a significantly high negative correlation with mean humidity (p < 0.01). The estimated ET0 by the lysimeter experiment was evaluated to be highly conformable with the ET0 calculated by the FAO PM equations. Follow-up studies such as long-term monitoring are necessary to cope with the changing climate every year.

The linear equation and coefficient of determination (R2) between the LYET and PMET/HSET using the regression equations.

X-axis PMET-WJ HSET-WJ PMET-JJ HSET-JJ
Y-axis Linear equation (R2) Linear equation (R2) Linear equation (R2) Linear equation (R2)
LYET-FL y=1.066x (0.927) y=0.748x (0.736) y=0.932x (0.919) y=0.797x (0.718)
LYET-CL y=1.003x (0.905) y=0.703x (0.709) y=0.877x (0.897) y=0.747x (0.676)

†LYET, reference evapotranspiration calculated by the weighable lysimeter; PMET, reference evapotranspiration calculated by the FAO Penman-Monteith equation (Allen et al., 1998); HSET, reference evapotranspiration calculated by the Hargreaves equation (Hargreaves and Samani, 1985).‡WJ, lysimeter station located at the National Institute of Agricultural Sciences in Wanju; JJ, Jeonju.§FL and CL are indicated fine loamy and coarse loamy in soil textural family, respectively.∫Missing data in 27th and 28th November, 2015 at lysimeter station (Wanju).

Keywords
FAO Penman-Monteith equation
Hargreaves equation
Meteorological factor
Reference evapotranspiration
Weighable lysimeter

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Information
  • Publisher :Korean Society of Soil Science and Fertilizer
  • Publisher(Ko) :한국토양비료학회
  • Journal Title :Korean Journal of Soil Science and Fertilizer
  • Journal Title(Ko) :한국토양비료학회 학회지
  • Volume : 52
  • No :3
  • Pages :284-296
  • Received Date : 2019-08-13
  • Revised Date : 2019-08-27
  • Accepted Date : 2019-08-29
  • DOI :https://doi.org/10.7745/KJSSF.2019.52.3.284
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