Abstract: The study on the dynamic changes in the leaf stomatal conductance of invasive plant Spartina alterniflora in loamy mangrove habitat from noon (ebbtide) to evening and the relevant environmental factors showed that the leaf stomatal conductance of S. alterniflorawas in the order of upper part > top > lowermid part > lower part, and had a power function relationship with light intensity and leaf temperature but a negative exponential function relationship with time and relative humidity. It was the greatest at 50%-60% relative humidity, and became smaller with the further increase of the humidity. The midpart leaves had the greatest contribution to the accumulation of photosynthates. There existed interactions among diverse environmental factors on the stomatal opening and closure, and thus, the leaf stomatal conductance of S. alterniflora could be viewed as a comprehensive response to environmental parameters.

Key words: Snow hazard index, Remote sensing monitoring, Snow disaster evaluation