东莞市土地景观格局破碎化分析

探讨东莞市景观格局的破碎化程度可促进东莞市生态环境、社会经济的可持续发展。以景观生态学理论为指导,选用斑块数、斑块平均大小、破碎化指数、分维数、边界密度、斑块密度、景观多样性指数、景观优势度、景观破碎度指数等景观格局指数,分析东莞市1988~2006年土地镶嵌结构对景观结构的影响,探讨东莞市土地景观格局破碎化演变特征。研究表明：建设用地斑块不断入侵、同化耕地景观与自然景观斑块,研究区景观斑块数量不断增加,平均斑块面积迅速减小,表明东莞市景观破碎化程度不断加深;1995年以后研究区土地利用程度增速较慢,表明研究区在城市急剧扩张以后更注重城市的整体发展,景观破碎化的速度逐渐回归理性。

Analysis on the Landscape Fragmentation in Dongguan

The analysis of the landscape fragmentation in Dongguan could promote the sustainable development of its eco-environment,society and economy.Guided by the theory of landscape ecology,various landscape indexes,including patch number,mean patch area,fragmentation index,fractal dimensions,boundary density,patch density,landscape diversity,landscape dominance and landscape fragmentation,are selected to analyze the evolution features of landscape fragmentation in Dongguan.As indicated by the results,the construction land constantly invades and occupies the farmland and natural landscape,the patch number within the study area keeps increasing,while the mean patch area decreases rapidly,which indicates that the landscape fragmentation degree intensifies;the land use degree improves slowly after 1995,showing that Dongguan puts more emphasis on its overall development in the context of rapid city expansion and the landscape fragmentation speed tends to rationalize.