Abstract: To investigate the photosynthetic characteristics of Humulus scandens, Paulownia fortunei and Solanum nigrum, the lightresponse curves of photosynthetic electrons and photosynthesis were measured simultaneously by LI-6400-40B chlorophyll fluorometer. Then the differences in the photosynthetic characteristics of these plants and their courses were studied based on a mechanistic model of lightresponse of photosynthetic electron flow and photosynthesis. The results showed that H. scandens had the lowest chlorophyll content, while its eigenabsorption crosssection was the maximum. The chlorophyll content of P. fortunei was 1.2 times as much as that of S. nigrum, while the electron transport rates of both plants were almost same. The main reasons that determine the differences of photosynthetic characteristics of different plant species are: (1) the eigenabsorption crosssection of lightharvesting pigments of S. nigrum was greater than that of P. fortunei; (2) the minimum average lifetime of photosynthetic pigment molecules in the excited state for S. nigrum was shorter than that of P. fortunei; and (3) the use efficiency of photosynthetic electron of S. nigrum was higher than that of P. fortunei. Moreover, the photosynthetic characteristics of the plants were probably affected by the lightresponse of the effective light absorption cross-section of photosynthetic pigments and the lightresponse of the photosynthetic pigments in the lowest excited state.

Key words: lime, material flow analysis, carbon capture and storage., carbon sink, missing carbon sink