Analysis on the Degree of Land Saline-Alkalization and Spatial Variation Characteristics in the Blackland of Western Heilongjiang Province

The western Heilongjiang Province is one of the most important land saline-alkalization region in China. Taking the vector data of land saline-alkalization in 1976 and 2001 as the information source, the paper evaluated the degree of land saline-alkalization in the west of Heilongjiang Province, and analyzed spatial-temporal variation characteristics of land saline-alkalization by raster technology and ordinary kriging fitting method in Geostatistics. The results showed that the degree of land saline-alkalization was lower than 0.4 except Daqing urban areas in 1976. Furthermore, it took three points as land saline-alkalization center, and the field was reduced nearly concentric ring outwards, and degree of land saline-alkalization was generally lower; the land saline-alkalization degree of Lindian county proved to have the largest increase in 2001, the second were Daqing urban areas, Zhaoyuan county and Dumeng county. The land saline-alkalization degree took only one point as center, and the field was reduced nearly coaxial strip of width outwards, , which is generally higher than that of 1976.