The diffusion of 99 Tc in granite was investigated with small-sized diffusion cells, composed of a radioactive source solution cell and a sampling cell. Water in the two cells was kept at the same level. 1 ml aliquots were taken from the sampling cells daily during the first 50 days, then at intervals of several days, and measured via liquid scintillation counting. The experimental results indicate that the diffusion of 99 Tc and 3 H in granite follows the one-dimensional diffusion equation when diffusion time is long enough (> 100 days). The calculated average diffusion coefficient of 99 Tc (1.4 × 10 −12 m 2 /s) is about one half of that of 3 H (3.2 × 10 −12 m 2 /s).
Eddy correlation technique was used to obtain the carbon fluxes (2012 and 2013) in the coastal wetlands of the Liaohe Delta. The carbon flux daily data were used to validate the biogeochemical models that are parameterized by data such as meteorology and water level (Wetland-DNDC). The observation results showed that the trend of carbon flux in the Liaohe Delta is absorption in growing season and weak discharge in non-growing season. The model results showed significant linear correlation with the observation, the simulation result was relatively correct. The results showed that the trend of Reed output is consistent with that of simulation. The annual carbon sequestration capacity was estimated to be 1502.24g-CO2-m−2 on an average in the recent 30 years, with a fluctuating increase trend. Further analysis explained the correlation between environmental factors such as temperature, precipitation and CO2 content and the annual carbon sequestration amount. Correlation between CO2 content and annual absorption was followed by temperature, with no correlation with precipitation. The carbon sequestration capacity of the Liaohe Delta increases with change of climate.
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