Analysis on ecological footprint of sustainable development in Sanjiangyuan Region

The ecological problems of Sanjiangyuan Region have a very important impact on the national ecology and economy. It is of great significance to study the sustainability of its environmental and socioeconomic development. The study used the ecological footprint model to calculate and analyze the ecological footprint, ecological carrying capacity and ecological surplus of Sanjiangyuan from 2000 to 2012 year. The research results showed that the per capita ecological footprint of Sanjiangyuan was on an upward trend from 2000 to 2012, and the land use types were unevenly distributed. Among the above 6 land use types, the supply rate of crop land was the largest, followed by forest land, water land, grassland, and the supply rate of fossil fuel land and built-up land. Per capita ecological carrying capacity showed a downward trend. The order of decline was 40% for built-up land, 29.95% for grassland, 20% for crop land, 14.81% for woodland, and 2% for water. In addition, the grassland contributed the most to the ecological carrying capacity, with an annual average contribution rate of 41%, followed by 38% for forest land; Sanjiangyuan Region had an overall ecological surplus, but the surplus had a downward trend. There were also differences in the ecological gains and losses of different land types. Among them, grass land and forest land were ecological surpluses, and the crop land and fossil fuel land were ecological deficits. Water land and built-up land began to shift from ecological surpluses to ecological deficits.