Energy exchange characteristics of wetlands in the Liaohe River Delta

doi:10.14088/j.cnki.issn0439-8114.2024.09.010

Abstract

Abstract: To explore the energy exchange characteristics of wetlands in the Liaohe River Delta, the observation data from the Panjin Rice Experiment Station of the Northeast Ecological and Agricultural Meteorological Field Scientific Experiment Base of the China Meteorological Administration in 2019 were used to analyze the average field characteristics, sensible heat flux, latent heat flux, and radiation budget of paddy fields in Panjin Wetland. The results showed that the average annual temperature in the study area was 10.9 ℃, and the annual precipitation was 747.8 mm. Precipitation mainly occurred from May to September, accounting for about 88.7% of the annual precipitation;throughout the year, southwest winds dominated, followed by northeast winds. The wind speed was higher in spring and lower in other seasons. The maximum sensible heat flux and latent heat flux in each season were concentrated at noon, while the sensible heat flux was highest in spring, with an average annual value of 9.26 W/m²;the latent heat flux was concentrated from May to September, with an annual average of 53.39 W/m². The total solar radiation was the main factor affecting net radiation, and the net radiation in each season showed the order of spring>summer>autumn>winter;the downward shortwave radiation was manifested as spring>summer>autumn>winter;upward shortwave radiation was manifested as spring>summer>winter>autumn. In the energy exchange between wetlands and the atmosphere, latent heat exchange was dominant throughout the year, with sensible heat exchange being dominant in spring and summer, and latent heat exchange being dominant in autumn and winter;the Bowen ratio was positively correlated with wind speed, evapotranspiration coefficient and saturated vapor pressure difference, and the evapotranspiration coefficient was negatively correlated with wind speed. The Bowen ratio first rapidly decreased and then slowly increased to stabilize with the increase of saturated vapor pressure difference.

Key words: wetland, energy exchange, Liaohe River Delta, characteristic

CLC Number:

P425.2⁺3

MIAO Jing, YANG Tong-yu, YI Xi-yan, SUN Lin-lin, YUAN Chao, ZHAO Shuo. Energy exchange characteristics of wetlands in the Liaohe River Delta[J]. HUBEI AGRICULTURAL SCIENCES, 2024, 63(9): 52-59.

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