Abstract
In this paper, we adopted the pot simulation test method and took the plants that had been polluted by heavy metals as the research materials, to reveal the effect of mercury stress on photosynthetic characteristics and material production of turf grass. The results showed that, with the increase of the mercury stress intensity and the extension of time, the net photosynthetic rate (Pn), stomatal conductance (Gs) and transpiration rate (Tr) of leaf of the two kinds of grass continued to decline, while the intercellular CO<sub>2</sub> concentration (Ci) continued to rise. The influence of mercury stress on photosynthetic characteristics of the two kinds of grass was shifting from stomatal limitation to non-stomatal limitation. The results of this study provide a theoretical basis for exploring the mechanism of mercury stress on the photosynthetic characteristics of turf grass.
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