吉林省镇赉县近10年景观格局变化

以吉林省镇赉县2000年、2005年、2009年三期TM遥感影像为信息源,在小尺度下通过RS解译,对GIS建立的空间数据模型叠加分析和景观特征指数计算,结合自然与人文要素,具体分析镇赉县土地利用景观格局的变化情况。分析结果表明:近10a间研究区景观斑块面积和斑块的数量发生明显变化,水体景观类型斑块数量呈现大幅度增加,研究区各景观面积动态度变化显著,耕地面积大幅度增加,而草地和未利用土地面积大幅度减少。研究区景观破碎化程度较低、景观分维数较小且变化不大、景观异质性低,景观较为完整,该地区生态表现出明显的脆弱性和易恢复性。自然环境的制约、人为活动的干扰、政策的导向等因素决定和影响了该地区景观格局的变化趋势。

The Change of landscape pattern in Zhenlai Xian, Jilin Province in recent ten years

This paper concretely analyzes the change of landscape pattern of land use in Zhenlai Xian, Jilin Province. The analysis combines natural elements and humanistic elements. The information source is TM remote sensing image of 2000, 2005 and 2009 in Zhenlai Xian. Through the interpretation of RS on small scales, this essay superimposes and analyzes the spatial data model established by GIS. Moreover, the paper calculates the landscape characteristic indexes of the spatial data model. The analysis shows that the area and number of landscape patches in research district changed obviously in the past ten years. The patch number of water landscape has increased substantially. The dynamic degree of different landscape area has changed enormously in study district. The area under cultivation has increased by a large margin while the areas of grassland and unused land have decreased by a large margin. In the study district, the fragmentation degree of landscape is lower. The fractal dimension of landscape is smaller and changes little. The heterogeneity of landscape is low. The landscape is relatively integrated. The ecology in this district shows obvious vulnerability and easy resilience. Three main driving forces affected the change of landscape pattern of land use in this district restriction of natural environment, interference of human activities and policy direction. The three factors decide and affect the changing trend of landscape pattern.