Land resources survey by remote sensing and analysis of land carrying capacity for population in Tumen river region

Abstract

The Tumen river region including Yanji, Tumen, Longjing and Hunchun cities is situated in the east part of Jilin Province. The region is an important economic exploitation area in the province. The total area is 10,228.86 km². There are superior geographical location, rich natural resources, various gemorphological types and less farmland in the region. The remote sensing technique is adopted in the survey of present landuse. The newest Landsat and CCT data are selected in the survey. Comparing the data obtained from remote sensing survey with the data from land detail investigation we can see that the paddy-field, garden for planting fruits, residential area and factory and mine, traffic land have increased in different extents, especially, the residential area is increased rapidly, but the forest land, grazing land have decreased. The unused land has been used. Land productive potentiality system is a multi-hierarchic comprehensive-complex system of natural economy. Its core is photosynthesis of green vegetation, which is affected by factors such as radiation, temperature, rainfall, soil fertility and management level. According to calculation of productive potentiality, the analysis of carrying capacity for population has been done and the conclusion is drawn. After 2000, the population growth in the region will be restricted by lack of reserve of farmland resources and level of grain production. Existing land and its reserve resources can not carry a population more than 150×10⁴. It is estimited that the grain only depends on transportation outside to meet the needs of population growth and social development after 2000.