WANG Yusong, JIA Guodong, ZHANG Yonge, et al. Study on the Separation of Evapotranspiration of[J]. 2019, 33(2): 272-278.
DOI:
WANG Yusong, JIA Guodong, ZHANG Yonge, et al. Study on the Separation of Evapotranspiration of[J]. 2019, 33(2): 272-278. DOI: 10.13870/j.cnki.stbcxb.2019.02.042.
Taking the Platycladus orientalis forest distributed widely in Beijing mountain area as research object
the evapotranspiration of the stand was quantitatively separated by two methods
which were hydrological measurement method (sap flow sluice combined with large-scale lysimeter) and stable isotope. The results showed that:(1) On the daily scale
the evapotranspiration and transpiration of the stand both showed "single peak" type curves. The total evapotranspiration and transpiration of the stand reached the maximum values around noon
which was 1.27 mm/h and 1.13 mm/h
respectively. (2) The proportion of transpiration to total evapotranspiration calculated by the measured method and the stable isotope method was 80.21%~89.63% and 79.10%~98.71%
respectively. Compared with the measured values
the error of the stable isotope method was(3.97±3.53)% on the hourly scale
and was (1.89±0.67)% on the daily scale. The evapotranspiration of this stand was mainly from the transpiration of vegetation
and the water consumption of forest transpiration was far greater than that of soil evaporation.
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references
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