Spatial-temporal variation characteristics of land use pattern in Liaohe Conservation Area from 2010 to 2018

The regional land use pattern is mainly affected by economic, policy and climate conditions. The change of land use pattern will affect the quality of regional ecological environment. Through visual interpretation of remote sensing images, on-site exploration and other methods, a total of 9 periods of land use data from 2010 to 2018 were formed. Considering from temporal and spatial pattern, change intensity, land use transfer matrix and ecosystem pattern, the spatial distribution, temporal and spatial changes of land use in Liaohe Conservation Area were analyzed. The results showed that Liaohe Conservation Area was dominated by wetlands, cultivated land and water bodies at the beginning of the reserve designation in 2010, accounting for 81.3% of the total area. With the establishment of the conservation area in 2011, the proportion of cultivated land decreased from 33.5% to 8.3%, and the proportion of grassland increased from 0.4% to 23.5%. From 2010 to 2018, the dynamic degree of comprehensive land use in Liaohe Conservation Area showed a downward trend,among which the dynamic degree of comprehensive land use was higher in 2011, 2014 and 2018, and the transformation among various land use types was relatively fierce. The land use types with larger dynamic degree of single land use were cultivated land, grassland and forestland, etc. From 2010 to 2018, the aggregation degree of landscape pattern of Liaohe Conservation Area was basically stable, and the connectivity was slightly improved. The establishment of Liaohe Conservation Area and the implementation of relevant measures had promoted the increase of ecological land area and played a positive role in the ecological restoration of the conservation area.