The Characteristics of Cultivated Land Quality and Its Spatial Variation in Black Soil Region of Songnen High Plain——A Case Study of Bayan County in Heilongjiang Province
以黑龙江省巴彦县为例，利用3S技术提取评价指标，通过多因素综合评价模型计算耕地质量得分并分级，发现耕地质量呈正态分布，以四等地最多，且与地貌、土壤类型和海拔密切相关，乡镇间差异显著。
It is of important reference value to control the characteristics of cultivated land quality and spatial distribution pattern accurately for improving the production capacity of cultivated land.This paper selected the typical area of Black Soil Region of Songnen High Plain—Bayan County in Heilongjiang Province as the study area and obtained cultivated land quality evaluation units by laying over the cultivated land use map,soil map,slope map and administrative division map.Then we extracted evaluation index attribute data that could reflect the characteristics of cultivated land quality by 3S technologies.In this paper we calculated the comprehensive score using the multi-factor synthetic evaluation model and divided rank on the score.Then we further analyzed the overall characteristics of cultivated land quality and spatial distribution of geographical and administrative area.The results show that the cultivated land quality exhibited normal distribution characteristics with the fourth-class for the peak,the third-class for the second peak,and gradually reduced to the fifth-class,the second-class and the first-class.The quality of most of cultivated land was in the middle and upper level.Cultivated land quality grade had a close relationship with geomorphic type,soil type and altitude,showing significant regional differentiation regularity.There was a greater difference in cultivated land quality grade among towns,and this could directly influence the types of economic activity and the development of agricultural production.