Monthly dynamic variation of soil seed bank in water-level-fluctuating zone of Three Gorges Reservoir at the beginning after charging water

Abstract

The periodical fluctuation of water鄄level鄄fluctuating zone in Three Gorges Reservoir led to the variation of the soil ecological environment between wet and dry state. This variation inevitably produce a greater change in the soil seed bank, which further affects the standing vegetation recovery and growth. In this paper, we studied the dynamic variation of soil seed bank in water鄄level鄄fluctuating zone of Three Gorges Reservoir at the beginning after charging water was studied by substituting flooding time gradient with vertical space gradient. As soil seed bank density of clear鄄cutting land increased gradually with time, the density of abandoned farmland decreased. With the vertical space gradient increasing, density of soil seed bank in water鄄level鄄fluctuating zone in May, July, September showed gradual increasing trend respectively. The