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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Carbon Dioxide and Water Vapour Fluxes of a Alkaline Fen and Their Dependence on Reflectance
摘要： This study shows results of parallel measurements of greenhouse gases fluxes (carbon dioxide and water vapour) and canopy reflectance of alkaline fen. Fluxes were measured using eddy-covariance technique on micrometeorological station located in the Upper Biebrza Basin (NE Poland) in Rogo?ynek Village. Study site is located in the Biebrza National Park which was established to protect one of the biggest coherent lowland wetland area in the Central Europe. Statistical relations of reflectance and spectral indices with fluxes were calculated based on measurements during two growing season (2015 and 2016). Four types of functions were examined: linear, quadratic, exponential and logarithmic and for two timestamps: half-hour and day. The correlation between carbon dioxide fluxes and reflectance is better than for water vapour fluxes. For both carbon dioxide and water vapour we obtained higher correlations coefficients using selected spectral indices than using reflectance and higher correlations for daily timestamp than for half-hour fluxes.
关键词： greenhouse gases,eddy-covariance technique,spectral indices,Biebrza River valley,wetland
更新于2025-09-23 15:22:29
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Dynamic Changes of the Alpine Wetlands in Tibet, China
摘要： Based on the field investigation and long term remote sensing data, the dynamic changes of the alpine wetland in Tibet were studied. Results showed the alpine wetlands accounted for 13.99% of total wetlands in China in 2010. The area of lakes were 31653.16 km2, accounting for 58.79 % of total wetlands in Tibet. Lakes were mostly located in Northern Tibet, accounting for 93.37% of the total lakes in Tibet. The variation in lake shape is also significant in Northern Tibet. Lake appeared an increasing trend in the past 20 years, with an increase of 35.3 %. However, river and swamp exhibited a tendency of decreasing with 833.49km2 and 2761.30 km2. The degraded swamp wetlands mainly distributed in Northern Tibet, representing 95.2% of the total reduced area. There existed 12.43% of reduced swamp converted into lakes or rivers on the basis of remote sensing image interpretation.
关键词： wetland,remote sensing,Northern Tibet
更新于2025-09-09 09:28:46