Temporal and spatial characteristics of the change of cultivated land resources in the Black Soil Region of Heilongjiang Province (China)

Abstract

It is of great significance for the improvement of grain production capacity and the protection of cultivated land in the Black Soil Region to reveal the temporal and spatial evolution trend of the change in cultivated land resources. In this paper, the temporal and spatial variation pattern of cultivated land resources in Heilongjiang Province was analyzed based on the remote sensing imagesmade in 1995, 2005, and 2015 with the 3S Technology by using the land use dynamic degree, kernel density analysis, and transfermatrixmethods. The results showed that, during the two decades from1995 to 2015, the total quantity of cultivated land increased slightly. To be specific, in 1995-2005, the total quantity of cultivated land increased; in 2005-2015, the number decreased. Spatially, the conversion of cultivated land was mainly concentrated in the west of Heilongjiang Province. During the study period, the high-density cultivated land areawas concentrated in thewest ofHeilongjiang Province, and the largest increase came inHeihe City andQitaihe City. The conversion between each land type and cultivated landwas observed. The internal conversion of cultivated land was between dryland and paddy field. The transfer-out of cultivated land was mainly the conversion of dryland into construction land and woodland, and the transfer-in was mainly the conversion of woodland, unused land, and construction land into dryland, while only a small quantity of conversion involving paddy field was found. Spatially, the conversion mainly took place in Harbin City, Heihe City, and Suihua City in the center and west of Heilongjiang Province, and also in a moderate amount in Qiqihar City in the east of Heilongjiang Province.