1990-2015年赣江流域耕地时空特征及景观格局分析

Spatial-temporal Characteristics and Landscape Pattern Analysis of Cultivated Land in Ganjiang River Basin from 1990 to 2015

基于地理空间信息技术开展大范围长时序耕地时空动态及演变研究是自然资源管理与保护领域的重要内容之一.本文基于多时相遥感影像数据,利用地理空间信息技术提取出1990-2015年赣江流域耕地数据,并采用动态度、转移矩阵、核密度分析和景观格局指数分析此间该流域耕地的动态演变及时空格局分布特征.结果显示:1990-2015年赣江流域耕地面积不断减少,规模呈现萎缩态势;耕地的主要来源与去向与林地、草地和建设用地密切相关;空间分布由南向北趋于集聚,逐渐由多而零散密集向少而集中密集变化;耕地景观破碎化程度和斑块形状复杂度呈现先减后增.本研究对赣江流域耕地资源保护、有序合理利用与可持续发展,具有一定参考价值.

Research on the temporal and spatial dynamics and evolution of large-scale and long-term arable land based on geospatial information technology is important for the field of natural resource management and protection.Based on multi-temporal remote sensing image data,this paper uses geospatial information technology to extract cultivated land data in the Ganjiang River Basin from 1990 to 2015,and uses dynamics,transfer matrix,nuclear density analysis,and landscape pattern index to analyze the dynamic evolution of cultivated land in the basin during this period.The results show that from 1990 to 2015,the area of cultivated land in the Ganjiang River Basin continued to decrease,and the scale showed a trend of shrinking;the main source and destination of cultivated land are closely related to woodland,grassland and construction land;the spatial distribution tends to agglomerate from south to north,gradually changing from scattered to concentrated,the degree of fragmentation of cultivated land landscape and the complexity of patch shape firstly decrease and then increase.This research has certain reference value for the protection,orderly and reasonable utilization and sustainable development of cultivated land resources in the Ganjiang River Basin.