9I.ohrenz, S., G. Fahnenstiel, O. Schofield, et al. , Coastal sediment dynamics and river discharge as key factors influencing coastal e cosystem productivity in Southeastern Lake Michigan[J]. Oceanography, 2008, 21 (4): 55-63.
10Li, H. , and J. Reynolds, A new contagion index to quantify spatial patterns of landscapes[ J]. Landscape Ecology, 1993 8:155-162.
