近30年来三江平原耕地面积变化分析

Analysis on the change of cultivated land area in Sanjiang Plain in the past 30 years

本研究选取三江平原1990年、2000年、2010年和2018年四期遥感影像为数据源,提取研究区水体、耕地、林地、湿地、建设用地、草地和未利用地七种土地利用类型,并通过土地利用动态度和土地利用转移矩阵对三江平原近30年土地利用动态变化展开分析。结果表明:近30年间,耕地和建设用地面积变化均处于增加状态,且耕地面积保持较大幅度的持续增加趋势,其中耕地面积增加主要由草地、湿地和未利用地转化而来;而草地、湿地、水体和未利用地的面积持续减少,其中草地和湿地减少最为显著;林地的面积呈波动趋势,变化不显著。

In this study, the four remote sensing images of Sanjiang Plain in 1990, 2000, 2010 and 2018 were selected as data sources to extract seven land use types:water, cultivated land, forest land, wetland, construction land, grassland and unused land in the study area.And through the land use dynamic degree and land use transfer matrix to analyze the dynamic changes of land use in the Sanjiang Plain in the past 30 years.The results show that over the past 30 years or so, the changes in the area of cultivated land and construction land have been increasing, and the cultivated land area has maintained a large and continuous increasing trend. Among them, the increase in cultivated land area is mainly derived from the conversion of grassland, wetland and unused land;The area of grassland, wetland, water body and unused land continued to decrease, among which the decrease of grassland and wetland was the most significant;the area of forest land showed a fluctuation trend, and the change was not significant.