Study on landscape pattern of Hegang City based on ANN-CA-Markov model

Abstract The research purpose of this paper is to grasp the changing characteristics of the landscape pattern in Hegang City, Heilongjiang Province, which can provide a scientific basis for formulating food security and ecological security policies. Hegang City was selected as the research area, based on its Landsat remote sensing images and DEM data in 2000, 2010 and 2020, Fragstats 4.0 software was used, and the Ann-CA-Markov coupling model was used to study the city's 2000–2020 period. Changes in the landscape pattern, and simulate and predict the landscape pattern in 2030. The results show that during the period from 2000 to 2020 in Hegang City, the area of cultivated land decreased by 197.9824 km2, the area of forest decreased by 52.7252 km2, the area of grassland decreased by 29.28 km2, the area of wetland increased by 217.27 km2, the area of water body increased by 33.99 km2, and the surface area of artificial land increased by 28.41 km2; simulation prediction The land use situation in 2030 is that the area of cultivated land is expected to increase by 1.0368 km2, the area of forest is expected to decrease by 0.0648 km2, the area of grassland is expected to decrease by 0.0972 km2, the area of wetlands will increase by 14.6448 km2, the area of water bodies will increase by 3.1317 km2, and the surface area of artificial land will decrease by 21.6513 km2; and the related landscapes are calculated. pattern index. The final conclusion is that the degree of fragmentation of agricultural and forestry land in Hegang City is relatively low, but it is subject to strong external interference. The landscape pattern should be further optimized and adjusted to continuously reduce the impact on the ecological environment and ensure food and ecological security.