1990-2015年长江中游地区耕地利用转型时空特征

发布时间：2018-06-04 21:32

本文选题：耕地 + 土地利用转型　；参考：《地理研究》2017年08期

【摘要】：依据土地利用转型理论内涵,尝试性地从显性形态视角构建耕地利用转型特征识别框架,基于1990-2015年间6期Landsat TM影像解译数据,定量刻画长江中游地区县域耕地利用形态时空特征,揭示不同时段耕地利用转型分异规律。结果表明:(1)1990-2015年间长江中游地区耕地利用显性形态经历了剧烈而非均衡的转型过程,耕地转换减少8075 km~2,且耕地转换量累积率在前20%的县域占总耕地转换量的66.9%;(2)25年间数量形态经历了"先减后增"的变化过程,且长江中游地区耕地利用转型均衡度呈现"阶段下降,快速上升,平稳降低"的变化趋势;(3)耕地空间形态整体呈现以武汉、长沙、南昌为中心向外扩散的分布特征,其中耕地转换量高值区主要呈现出明显的梯度分布特征,转型幅度高值区主要呈现"大聚集小分散"分布特征,转型速度高值区则主要呈现出"条带式"分布特征;(4)从地形起伏度上看,耕地利用转型整体呈现随地形起伏度上升而逐级降低的趋势,在1~2级地形起伏度上的县域耕地利用转型呈现无序状态,而在3~5级地形起伏度上的县域主要以低转型幅度和低转型速度为主。研究框架及结果对区域耕地利用转型识别和适度调整耕地利用和经营模式等具有积极意义。
[Abstract]:According to the connotation of land use transformation theory, this paper attempts to construct a framework for identifying the characteristics of cultivated land use transition from the perspective of dominant morphology, based on the interpretation data of 6 issues of Landsat TM images from 1990 to 2015. The temporal and spatial characteristics of cultivated land use patterns in counties in the middle reaches of the Yangtze River are quantitatively described, and the law of cultivated land use transformation and differentiation in different periods is revealed. The results show that the dominant form of cultivated land use in the middle reaches of the Yangtze River experienced a drastic and unbalanced transformation process between 1990 and 2015. The cultivated land conversion decreased by 8075 km2, and the accumulation rate of cultivated land conversion in the first 20% counties accounted for 66.9% of the total cultivated land conversion. During the past 25 years, the quantity form experienced the process of "decreasing first and then increasing", and the equilibrium degree of cultivated land use transformation in the middle reaches of the Yangtze River decreased in "stage". The change trend of "rising rapidly and steadily decreasing" is that the spatial form of cultivated land is distributed with Wuhan, Changsha and Nanchang as the center, and the high value area of cultivated land conversion mainly shows the characteristic of gradient distribution. The high value region of the transition range mainly presents the distribution characteristics of "large aggregation and small dispersion", while the high value area of the transition speed mainly presents the "banded" distribution feature (4) from the point of view of the relief degree of the terrain, The whole transformation of cultivated land use shows the trend of decreasing gradually with the increase of topographic fluctuation, and the transformation of cultivated land in county area on the level 1 and 2 of topographic fluctuation shows a disordered state. On the level of 3 ~ 5, the county is mainly characterized by low transition range and low transition speed. The research framework and results have positive significance for the identification of regional cultivated land use transformation and appropriate adjustment of cultivated land use and management model.
【作者单位】：中国地质大学公共管理学院;国土资源部法律评价工程重点实验室;中国科学院地理科学与资源研究所;
【基金】：国土资源部公益性行业科研专项(201511004)
【分类号】：F323.211

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