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cje ›› 2009, Vol. 28 ›› Issue (12): 2593-2599.

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Spatial identification of builtup land expansion and its significance.

CHENG Lan1,2,3;WU Zhi-feng2;WEI Jian-bing2;PANG Hai-yan4   

  1. 1uangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China|2uangdong Institute of Eco-vironment and Soil Sciences, Guangzhou 510650, China|3raduate University of Chinese Academy of Sciences, Beijing 100039, China|4outh China Normal University, Guangzhou 510631,China
  • Online:2009-12-10 Published:2009-12-10

Abstract: With the rapid development of economy and urbanization, built-up land expansion has posed an enormous pressure on land carrying capacity and ecological security. To identify and quantify the builtup land expansion pattern is one of the prerequisites of land consolidation. Taking Dongguan as an example, and based on GIS and RS techniques, an algorithm was established by spatial topology operation to quantitatively identify the builtup land expansion in different phases from 1979 to 2005. The builtup land expansion pattern in Dongguan in 1979-2005 could be described as a general process of leapfrog-edge-expansion-mixed-expansion-edge-expansion. Edge-expansion was the main expansion type, but leapfrog growth was dominant at the early phase. During the late phase of land expansion, the proportion of leapfrog growth decreased while that of infilling growth increased, because of the limited land resources and urban space.

Key words: Silicate-dissolving bacteria, lux marker genes, Triparental cross