Measurement and estimation of evapotranspiration in semi-arid grassland during the summer season in southwest Siberia

Yıl 2019, Cilt: 8 Sayı: 3, 257 - 266, 01.07.2019

Lisa Haselow Holger Rupp Andrej A. Bondarovich Ralph Meissner

https://doi.org/10.18393/ejss.567359

Öz

This study quantifies
actual evapotranspiration (ET_a) for a period from June to September
2016 measured by two weighable gravitation lysimeters in a semi-arid grassland
in southwest Siberia. As part of a crop rotation system, the first lysimeter
was fallow but covered with ruderal vegetation. The second lysimeter is
permanently characterized by pristine steppe vegetation. In addition to ET_a
measurements, the reference evapotranspiration (ET₀) is computed by
a Penman-Monteith model. The estimates are related to the ET_a records
and the model is evaluated with regard to its performance in a semi-arid
environment. The results indicated an ET_a driven by energy but
limited by water. Within 115 days the total amounts of ET_a ranged
from 205 mm to 374.1 mm, and daily values varied from 0.1 to 6.9 mm day^-1.
The large differences are caused by the different vegetation cover of the
lysimeters. Due to the high and dense canopy of the pristine steppe vegetation,
the transpiration term was considerably
higher compared to the ruderal vegetation where soil evaporation took the major
part. The daily ET_a records differed on average by -91.1% to the ET₀
estimates. The statistical analyses yielded a low correlation between ET_a
of the ruderal vegetation and ET₀ but an acceptable model
performance for the pristine steppe. However, it was observed that ET_a
occasionally exceeds ET₀, particularly after precipitation. Due to
the high water availability and the subsequent rise of ET_a, ET₀
was underestimated, whereas it was overestimated during dry periods. Finally,
the quality of the Penman-Monteith model varied substantially with the water
supply at the study site.

Anahtar Kelimeler

Actual evapotranspiration, Penman-Monteith FAO-56, semi-arid, Siberia, weighable gravitation lysimeter

Kaynakça

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