摘要
基于分形理论,选取从化区为研究对象,计算获取了从化区不同植被覆盖度斑块的面积、分维数、稳定性指数,分析了斑块分形特征在不同高程、坡度、坡向的分布及变化规律,得出如下结论。①从化区植被状况总体良好,中等(大于45%)及以上植被盖度的斑块面积占植被总面积的86.7%;距离城镇、公路等越远,斑块形状趋于复杂、无规律。②高程小于90 m时,低、中低植被覆盖度斑块面积比重较大;同时各类斑块形状也较零碎、复杂。高程大于90 m时,随高程增加,斑块分维数逐渐增加,稳定性逐渐降低。③从化区地形坡度以25°以下为主。低、中低植被覆盖度斑块主要分布在15°以下的区域,高植被覆盖度斑块则在15°以上区域占据主导优势。随着坡度的增加,同一植被覆盖度斑块的分维数、稳定性指数变化不明显。④阳坡的植被状况好于阴坡,但阴坡的斑块结构更复杂。
Based on the fractal theory,this paper calculates the area,fractal dimension and stability index of patches with different vegetation coverage in Conghua District,and analyzes the distribution and variation law of patch fractal characteristics in different elevation,slope and aspect.The results show that:①The vegetation condition in Conghua District is generally good,and the patch area with medium(>45%)and above vegetation coverage accounts for 86.7%of the total vegetation area.The farther it is from towns and highways,the more complex and irregular the patch shape is.②When the elevation is less than 90 m,the proportion of patch area with low,medium and low vegetation coverage is larger,and the shape of all kinds of patches is fragmented and complex.When the elevation is higher than 90 m,the fractal dimension of patches increases and the stability decreases with the increase of elevation.③The topographic slope in Conghua District is mainly below 25 degrees.The patches with low and middle vegetation coverage are mainly distributed in the area below 15 degrees,while those with high vegetation coverage are dominant in the area above 15 degrees.With the increase of slope,the fractal dimension and stability index of patches with the same vegetation coverage do not change significantly.④The vegetation condition of sunny slope is better than that of shady slope,but the patch structure of shady slope is more complex.
作者
常进
向慧昌
边振
廖建文
CHANG Jin;XIANG Huichang;BIAN Zhen;LIAO Jianwen(China Water Resources Pearl River Planning,Surveying&Designing Co.,Ltd.,Guangzhou 510610,China;University of Jinan,School of Water Conservancy and Environment,Jinan 250024,China)
出处
《人民珠江》
2021年第8期109-115,共7页
Pearl River
基金
国家自然科学基金(31400619)。
关键词
分形
地形因子
植被覆盖度
从化区
fractal
topographic factor
vegetation coverage
Conghua District
