Research on the influence of land use change to habitat of cranes in Shengjin Lake wetland

Shengjin Lake wetland reserve is an important habitat for the winter cranes of our country, and the change of land use structure in the area have had a vital influence on the winter cranes and their habitat. The TM remote sensing images of 1986–2015 years were selected in this paper, and the land use change model and gray relational analysis model were used to analyze the effect of land use degree on the habitat of the winter crane and correlation degree between cranes and land use of Shengjin lake wetland. The land use transformation method was employed to analyze the transfer of the habitat of cranes and the relationship between the size of the cranes habitat and the number of populations. The results showed that the degree of land use change fluctuated greatly in different periods, and comprehensive index of land use degree between 220 and 260, also the land use was based on woodland, grassland, and water and their effect on the habitat was limited; the marsh land had the highest retention rate among the cranes habitat being 34.44%. While the reed flat had the lowest rate, only 15.36%, and the reed breach land was mainly transferred to marsh and dry land, 23.22% and 18.16%, respectively. The mud was mainly transferred to water and farmland, respectively, for 31.79% and 27.75%; except the period from 2011 to 2015, the change of habitat area was basically consistent with the change of the number of cranes.